openstack/nova
Code Issues Proposed changes
nova/nova/compute/manager.py
Pawel Koniszewski c9091d0871 Add new API to force live migration to complete 
This change adds manual knob to force ongoing live migration to
complete. It is implemented as a new server-migrations API.

DocImpact
ApiImpact

Implements: blueprint pause-vm-during-live-migration
Change-Id: I034b4041414a797f65ede52db2963107f2ef7456
2016-02-08 08:59:52 +01:00

6737 lines
306 KiB
Python
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# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright 2011 Justin Santa Barbara
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Handles all processes relating to instances (guest vms).
The :py:class:`ComputeManager` class is a :py:class:`nova.manager.Manager` that
handles RPC calls relating to creating instances. It is responsible for
building a disk image, launching it via the underlying virtualization driver,
responding to calls to check its state, attaching persistent storage, and
terminating it.
"""
import base64
import contextlib
import functools
import inspect
import socket
import sys
import time
import traceback
import uuid
from cinderclient import exceptions as cinder_exception
import eventlet.event
from eventlet import greenthread
import eventlet.semaphore
import eventlet.timeout
from keystoneauth1 import exceptions as keystone_exception
from oslo_config import cfg
from oslo_log import log as logging
import oslo_messaging as messaging
from oslo_serialization import jsonutils
from oslo_service import loopingcall
from oslo_service import periodic_task
from oslo_utils import excutils
from oslo_utils import strutils
from oslo_utils import timeutils
import six
from six.moves import range
from nova import block_device
from nova.cells import rpcapi as cells_rpcapi
from nova.cloudpipe import pipelib
from nova import compute
from nova.compute import build_results
from nova.compute import claims
from nova.compute import power_state
from nova.compute import resource_tracker
from nova.compute import rpcapi as compute_rpcapi
from nova.compute import task_states
from nova.compute import utils as compute_utils
from nova.compute import vm_states
from nova import conductor
import nova.conf
from nova import consoleauth
import nova.context
from nova import exception
from nova import hooks
from nova.i18n import _
from nova.i18n import _LE
from nova.i18n import _LI
from nova.i18n import _LW
from nova import image
from nova.image import glance
from nova import manager
from nova import network
from nova.network import base_api as base_net_api
from nova.network import model as network_model
from nova.network.security_group import openstack_driver
from nova import objects
from nova.objects import base as obj_base
from nova.objects import instance as obj_instance
from nova.objects import migrate_data as migrate_data_obj
from nova import paths
from nova import rpc
from nova import safe_utils
from nova.scheduler import client as scheduler_client
from nova import utils
from nova.virt import block_device as driver_block_device
from nova.virt import configdrive
from nova.virt import driver
from nova.virt import event as virtevent
from nova.virt import storage_users
from nova.virt import virtapi
from nova import volume
from nova.volume import encryptors
compute_opts = [
cfg.StrOpt('console_host',
default=socket.gethostname(),
help='Console proxy host to use to connect '
'to instances on this host.'),
cfg.StrOpt('default_access_ip_network_name',
help='Name of network to use to set access IPs for instances'),
cfg.BoolOpt('defer_iptables_apply',
default=False,
help='Whether to batch up the application of IPTables rules'
' during a host restart and apply all at the end of the'
' init phase'),
cfg.StrOpt('instances_path',
default=paths.state_path_def('instances'),
help='Where instances are stored on disk'),
cfg.BoolOpt('instance_usage_audit',
default=False,
help="Generate periodic compute.instance.exists"
" notifications"),
cfg.IntOpt('live_migration_retry_count',
default=30,
help="Number of 1 second retries needed in live_migration"),
cfg.BoolOpt('resume_guests_state_on_host_boot',
default=False,
help='Whether to start guests that were running before the '
'host rebooted'),
cfg.IntOpt('network_allocate_retries',
default=0,
help="Number of times to retry network allocation on failures"),
cfg.IntOpt('max_concurrent_builds',
default=10,
help='Maximum number of instance builds to run concurrently'),
cfg.IntOpt('max_concurrent_live_migrations',
default=1,
help='Maximum number of live migrations to run concurrently. '
'This limit is enforced to avoid outbound live migrations '
'overwhelming the host/network and causing failures. It '
'is not recommended that you change this unless you are '
'very sure that doing so is safe and stable in your '
'environment.'),
cfg.IntOpt('block_device_allocate_retries',
default=60,
help='Number of times to retry block device '
'allocation on failures.\n'
'Starting with Liberty, Cinder can use image volume '
'cache. This may help with block device allocation '
'performance. Look at the cinder '
'image_volume_cache_enabled configuration option.')
]
interval_opts = [
cfg.IntOpt('bandwidth_poll_interval',
default=600,
help='Interval to pull network bandwidth usage info. Not '
'supported on all hypervisors. Set to -1 to disable. '
'Setting this to 0 will run at the default rate.'),
cfg.IntOpt('sync_power_state_interval',
default=600,
help='Interval to sync power states between the database and '
'the hypervisor. Set to -1 to disable. '
'Setting this to 0 will run at the default rate.'),
cfg.IntOpt("heal_instance_info_cache_interval",
default=60,
help="Number of seconds between instance network information "
"cache updates"),
cfg.IntOpt('reclaim_instance_interval',
min=0,
default=0,
help='Interval in seconds for reclaiming deleted instances. '
'It takes effect only when value is greater than 0.'),
cfg.IntOpt('volume_usage_poll_interval',
default=0,
help='Interval in seconds for gathering volume usages'),
cfg.IntOpt('shelved_poll_interval',
default=3600,
help='Interval in seconds for polling shelved instances to '
'offload. Set to -1 to disable.'
'Setting this to 0 will run at the default rate.'),
cfg.IntOpt('shelved_offload_time',
default=0,
help='Time in seconds before a shelved instance is eligible '
'for removing from a host. -1 never offload, 0 offload '
'immediately when shelved'),
cfg.IntOpt('instance_delete_interval',
default=300,
help='Interval in seconds for retrying failed instance file '
'deletes. Set to -1 to disable. '
'Setting this to 0 will run at the default rate.'),
cfg.IntOpt('block_device_allocate_retries_interval',
default=3,
help='Waiting time interval (seconds) between block'
' device allocation retries on failures'),
cfg.IntOpt('scheduler_instance_sync_interval',
default=120,
help='Waiting time interval (seconds) between sending the '
'scheduler a list of current instance UUIDs to verify '
'that its view of instances is in sync with nova. If the '
'CONF option `scheduler_tracks_instance_changes` is '
'False, changing this option will have no effect.'),
cfg.IntOpt('update_resources_interval',
default=0,
help='Interval in seconds for updating compute resources. A '
'number less than 0 means to disable the task completely. '
'Leaving this at the default of 0 will cause this to run '
'at the default periodic interval. Setting it to any '
'positive value will cause it to run at approximately '
'that number of seconds.'),
]
timeout_opts = [
cfg.IntOpt("reboot_timeout",
default=0,
help="Automatically hard reboot an instance if it has been "
"stuck in a rebooting state longer than N seconds. "
"Set to 0 to disable."),
cfg.IntOpt("instance_build_timeout",
default=0,
help="Amount of time in seconds an instance can be in BUILD "
"before going into ERROR status. "
"Set to 0 to disable."),
cfg.IntOpt("rescue_timeout",
default=0,
help="Automatically unrescue an instance after N seconds. "
"Set to 0 to disable."),
cfg.IntOpt("resize_confirm_window",
default=0,
help="Automatically confirm resizes after N seconds. "
"Set to 0 to disable."),
cfg.IntOpt("shutdown_timeout",
default=60,
help="Total amount of time to wait in seconds for an instance "
"to perform a clean shutdown."),
]
running_deleted_opts = [
cfg.StrOpt("running_deleted_instance_action",
default="reap",
choices=('noop', 'log', 'shutdown', 'reap'),
help="Action to take if a running deleted instance is detected."
"Set to 'noop' to take no action."),
cfg.IntOpt("running_deleted_instance_poll_interval",
default=1800,
help="Number of seconds to wait between runs of the cleanup "
"task."),
cfg.IntOpt("running_deleted_instance_timeout",
default=0,
help="Number of seconds after being deleted when a running "
"instance should be considered eligible for cleanup."),
]
instance_cleaning_opts = [
cfg.IntOpt('maximum_instance_delete_attempts',
default=5,
help='The number of times to attempt to reap an instance\'s '
'files.'),
]
CONF = nova.conf.CONF
CONF.register_opts(compute_opts)
CONF.register_opts(interval_opts)
CONF.register_opts(timeout_opts)
CONF.register_opts(running_deleted_opts)
CONF.register_opts(instance_cleaning_opts)
CONF.import_opt('console_topic', 'nova.console.rpcapi')
CONF.import_opt('host', 'nova.netconf')
CONF.import_opt('enabled', 'nova.vnc', group='vnc')
CONF.import_opt('enabled', 'nova.spice', group='spice')
CONF.import_opt('enable', 'nova.cells.opts', group='cells')
CONF.import_opt('image_cache_manager_interval', 'nova.virt.imagecache')
CONF.import_opt('enabled', 'nova.rdp', group='rdp')
CONF.import_opt('html5_proxy_base_url', 'nova.rdp', group='rdp')
CONF.import_opt('enabled', 'nova.mks', group='mks')
CONF.import_opt('mksproxy_base_url', 'nova.mks', group='mks')
CONF.import_opt('destroy_after_evacuate', 'nova.utils', group='workarounds')
CONF.import_opt('scheduler_tracks_instance_changes',
'nova.scheduler.host_manager')
LOG = logging.getLogger(__name__)
get_notifier = functools.partial(rpc.get_notifier, service='compute')
wrap_exception = functools.partial(exception.wrap_exception,
get_notifier=get_notifier)
@utils.expects_func_args('migration')
def errors_out_migration(function):
"""Decorator to error out migration on failure."""
@functools.wraps(function)
def decorated_function(self, context, *args, **kwargs):
try:
return function(self, context, *args, **kwargs)
except Exception as ex:
with excutils.save_and_reraise_exception():
wrapped_func = safe_utils.get_wrapped_function(function)
keyed_args = inspect.getcallargs(wrapped_func, self, context,
*args, **kwargs)
migration = keyed_args['migration']
# NOTE(rajesht): If InstanceNotFound error is thrown from
# decorated function, migration status should be set to
# 'error', without checking current migration status.
if not isinstance(ex, exception.InstanceNotFound):
status = migration.status
if status not in ['migrating', 'post-migrating']:
return
migration.status = 'error'
try:
with migration.obj_as_admin():
migration.save()
except Exception:
LOG.debug('Error setting migration status '
'for instance %s.',
migration.instance_uuid, exc_info=True)
return decorated_function
@utils.expects_func_args('instance')
def reverts_task_state(function):
"""Decorator to revert task_state on failure."""
@functools.wraps(function)
def decorated_function(self, context, *args, **kwargs):
try:
return function(self, context, *args, **kwargs)
except exception.UnexpectedTaskStateError as e:
# Note(maoy): unexpected task state means the current
# task is preempted. Do not clear task state in this
# case.
with excutils.save_and_reraise_exception():
LOG.info(_LI("Task possibly preempted: %s"),
e.format_message())
except Exception:
with excutils.save_and_reraise_exception():
wrapped_func = safe_utils.get_wrapped_function(function)
keyed_args = inspect.getcallargs(wrapped_func, self, context,
*args, **kwargs)
# NOTE(mriedem): 'instance' must be in keyed_args because we
# have utils.expects_func_args('instance') decorating this
# method.
instance = keyed_args['instance']
try:
self._instance_update(context, instance, task_state=None)
except exception.InstanceNotFound:
# We might delete an instance that failed to build shortly
# after it errored out this is an expected case and we
# should not trace on it.
pass
except Exception as e:
msg = _LW("Failed to revert task state for instance. "
"Error: %s")
LOG.warning(msg, e, instance=instance)
return decorated_function
@utils.expects_func_args('instance')
def wrap_instance_fault(function):
"""Wraps a method to catch exceptions related to instances.
This decorator wraps a method to catch any exceptions having to do with
an instance that may get thrown. It then logs an instance fault in the db.
"""
@functools.wraps(function)
def decorated_function(self, context, *args, **kwargs):
try:
return function(self, context, *args, **kwargs)
except exception.InstanceNotFound:
raise
except Exception as e:
# NOTE(gtt): If argument 'instance' is in args rather than kwargs,
# we will get a KeyError exception which will cover up the real
# exception. So, we update kwargs with the values from args first.
# then, we can get 'instance' from kwargs easily.
kwargs.update(dict(zip(function.__code__.co_varnames[2:], args)))
with excutils.save_and_reraise_exception():
compute_utils.add_instance_fault_from_exc(context,
kwargs['instance'], e, sys.exc_info())
return decorated_function
@utils.expects_func_args('instance')
def wrap_instance_event(function):
"""Wraps a method to log the event taken on the instance, and result.
This decorator wraps a method to log the start and result of an event, as
part of an action taken on an instance.
"""
@functools.wraps(function)
def decorated_function(self, context, *args, **kwargs):
wrapped_func = safe_utils.get_wrapped_function(function)
keyed_args = inspect.getcallargs(wrapped_func, self, context, *args,
**kwargs)
instance_uuid = keyed_args['instance']['uuid']
event_name = 'compute_{0}'.format(function.__name__)
with compute_utils.EventReporter(context, event_name, instance_uuid):
return function(self, context, *args, **kwargs)
return decorated_function
@utils.expects_func_args('image_id', 'instance')
def delete_image_on_error(function):
"""Used for snapshot related method to ensure the image created in
compute.api is deleted when an error occurs.
"""
@functools.wraps(function)
def decorated_function(self, context, image_id, instance,
*args, **kwargs):
try:
return function(self, context, image_id, instance,
*args, **kwargs)
except Exception:
with excutils.save_and_reraise_exception():
LOG.debug("Cleaning up image %s", image_id,
exc_info=True, instance=instance)
try:
self.image_api.delete(context, image_id)
except Exception:
LOG.exception(_LE("Error while trying to clean up "
"image %s"), image_id,
instance=instance)
return decorated_function
# TODO(danms): Remove me after Icehouse
# NOTE(mikal): if the method being decorated has more than one decorator, then
# put this one first. Otherwise the various exception handling decorators do
# not function correctly.
def object_compat(function):
"""Wraps a method that expects a new-world instance
This provides compatibility for callers passing old-style dict
instances.
"""
@functools.wraps(function)
def decorated_function(self, context, *args, **kwargs):
def _load_instance(instance_or_dict):
if isinstance(instance_or_dict, dict):
# try to get metadata and system_metadata for most cases but
# only attempt to load those if the db instance already has
# those fields joined
metas = [meta for meta in ('metadata', 'system_metadata')
if meta in instance_or_dict]
instance = objects.Instance._from_db_object(
context, objects.Instance(), instance_or_dict,
expected_attrs=metas)
instance._context = context
return instance
return instance_or_dict
try:
kwargs['instance'] = _load_instance(kwargs['instance'])
except KeyError:
args = (_load_instance(args[0]),) + args[1:]
migration = kwargs.get('migration')
if isinstance(migration, dict):
migration = objects.Migration._from_db_object(
context.elevated(), objects.Migration(),
migration)
kwargs['migration'] = migration
return function(self, context, *args, **kwargs)
return decorated_function
class InstanceEvents(object):
def __init__(self):
self._events = {}
@staticmethod
def _lock_name(instance):
return '%s-%s' % (instance.uuid, 'events')
def prepare_for_instance_event(self, instance, event_name):
"""Prepare to receive an event for an instance.
This will register an event for the given instance that we will
wait on later. This should be called before initiating whatever
action will trigger the event. The resulting eventlet.event.Event
object should be wait()'d on to ensure completion.
:param instance: the instance for which the event will be generated
:param event_name: the name of the event we're expecting
:returns: an event object that should be wait()'d on
"""
if self._events is None:
# NOTE(danms): We really should have a more specific error
# here, but this is what we use for our default error case
raise exception.NovaException('In shutdown, no new events '
'can be scheduled')
@utils.synchronized(self._lock_name(instance))
def _create_or_get_event():
instance_events = self._events.setdefault(instance.uuid, {})
return instance_events.setdefault(event_name,
eventlet.event.Event())
LOG.debug('Preparing to wait for external event %(event)s',
{'event': event_name}, instance=instance)
return _create_or_get_event()
def pop_instance_event(self, instance, event):
"""Remove a pending event from the wait list.
This will remove a pending event from the wait list so that it
can be used to signal the waiters to wake up.
:param instance: the instance for which the event was generated
:param event: the nova.objects.external_event.InstanceExternalEvent
that describes the event
:returns: the eventlet.event.Event object on which the waiters
are blocked
"""
no_events_sentinel = object()
no_matching_event_sentinel = object()
@utils.synchronized(self._lock_name(instance))
def _pop_event():
if not self._events:
LOG.debug('Unexpected attempt to pop events during shutdown',
instance=instance)
return no_events_sentinel
events = self._events.get(instance.uuid)
if not events:
return no_events_sentinel
_event = events.pop(event.key, None)
if not events:
del self._events[instance.uuid]
if _event is None:
return no_matching_event_sentinel
return _event
result = _pop_event()
if result is no_events_sentinel:
LOG.debug('No waiting events found dispatching %(event)s',
{'event': event.key},
instance=instance)
return None
elif result is no_matching_event_sentinel:
LOG.debug('No event matching %(event)s in %(events)s',
{'event': event.key,
'events': self._events.get(instance.uuid, {}).keys()},
instance=instance)
return None
else:
return result
def clear_events_for_instance(self, instance):
"""Remove all pending events for an instance.
This will remove all events currently pending for an instance
and return them (indexed by event name).
:param instance: the instance for which events should be purged
:returns: a dictionary of {event_name: eventlet.event.Event}
"""
@utils.synchronized(self._lock_name(instance))
def _clear_events():
if self._events is None:
LOG.debug('Unexpected attempt to clear events during shutdown',
instance=instance)
return dict()
return self._events.pop(instance.uuid, {})
return _clear_events()
def cancel_all_events(self):
our_events = self._events
# NOTE(danms): Block new events
self._events = None
for instance_uuid, events in our_events.items():
for event_name, eventlet_event in events.items():
LOG.debug('Canceling in-flight event %(event)s for '
'instance %(instance_uuid)s',
{'event': event_name,
'instance_uuid': instance_uuid})
name, tag = event_name.rsplit('-', 1)
event = objects.InstanceExternalEvent(
instance_uuid=instance_uuid,
name=name, status='failed',
tag=tag, data={})
eventlet_event.send(event)
class ComputeVirtAPI(virtapi.VirtAPI):
def __init__(self, compute):
super(ComputeVirtAPI, self).__init__()
self._compute = compute
def _default_error_callback(self, event_name, instance):
raise exception.NovaException(_('Instance event failed'))
@contextlib.contextmanager
def wait_for_instance_event(self, instance, event_names, deadline=300,
error_callback=None):
"""Plan to wait for some events, run some code, then wait.
This context manager will first create plans to wait for the
provided event_names, yield, and then wait for all the scheduled
events to complete.
Note that this uses an eventlet.timeout.Timeout to bound the
operation, so callers should be prepared to catch that
failure and handle that situation appropriately.
If the event is not received by the specified timeout deadline,
eventlet.timeout.Timeout is raised.
If the event is received but did not have a 'completed'
status, a NovaException is raised. If an error_callback is
provided, instead of raising an exception as detailed above
for the failure case, the callback will be called with the
event_name and instance, and can return True to continue
waiting for the rest of the events, False to stop processing,
or raise an exception which will bubble up to the waiter.
:param instance: The instance for which an event is expected
:param event_names: A list of event names. Each element can be a
string event name or tuple of strings to
indicate (name, tag).
:param deadline: Maximum number of seconds we should wait for all
of the specified events to arrive.
:param error_callback: A function to be called if an event arrives
"""
if error_callback is None:
error_callback = self._default_error_callback
events = {}
for event_name in event_names:
if isinstance(event_name, tuple):
name, tag = event_name
event_name = objects.InstanceExternalEvent.make_key(
name, tag)
try:
events[event_name] = (
self._compute.instance_events.prepare_for_instance_event(
instance, event_name))
except exception.NovaException:
error_callback(event_name, instance)
# NOTE(danms): Don't wait for any of the events. They
# should all be canceled and fired immediately below,
# but don't stick around if not.
deadline = 0
yield
with eventlet.timeout.Timeout(deadline):
for event_name, event in events.items():
actual_event = event.wait()
if actual_event.status == 'completed':
continue
decision = error_callback(event_name, instance)
if decision is False:
break
class ComputeManager(manager.Manager):
"""Manages the running instances from creation to destruction."""
target = messaging.Target(version='4.9')
# How long to wait in seconds before re-issuing a shutdown
# signal to an instance during power off. The overall
# time to wait is set by CONF.shutdown_timeout.
SHUTDOWN_RETRY_INTERVAL = 10
def __init__(self, compute_driver=None, *args, **kwargs):
"""Load configuration options and connect to the hypervisor."""
self.virtapi = ComputeVirtAPI(self)
self.network_api = network.API()
self.volume_api = volume.API()
self.image_api = image.API()
self._last_host_check = 0
self._last_bw_usage_poll = 0
self._bw_usage_supported = True
self._last_bw_usage_cell_update = 0
self.compute_api = compute.API()
self.compute_rpcapi = compute_rpcapi.ComputeAPI()
self.conductor_api = conductor.API()
self.compute_task_api = conductor.ComputeTaskAPI()
self.is_neutron_security_groups = (
openstack_driver.is_neutron_security_groups())
self.consoleauth_rpcapi = consoleauth.rpcapi.ConsoleAuthAPI()
self.cells_rpcapi = cells_rpcapi.CellsAPI()
self.scheduler_client = scheduler_client.SchedulerClient()
self._resource_tracker_dict = {}
self.instance_events = InstanceEvents()
self._sync_power_pool = eventlet.GreenPool()
self._syncs_in_progress = {}
self.send_instance_updates = CONF.scheduler_tracks_instance_changes
if CONF.max_concurrent_builds != 0:
self._build_semaphore = eventlet.semaphore.Semaphore(
CONF.max_concurrent_builds)
else:
self._build_semaphore = compute_utils.UnlimitedSemaphore()
if max(CONF.max_concurrent_live_migrations, 0) != 0:
self._live_migration_semaphore = eventlet.semaphore.Semaphore(
CONF.max_concurrent_live_migrations)
else:
self._live_migration_semaphore = compute_utils.UnlimitedSemaphore()
super(ComputeManager, self).__init__(service_name="compute",
*args, **kwargs)
# NOTE(russellb) Load the driver last. It may call back into the
# compute manager via the virtapi, so we want it to be fully
# initialized before that happens.
self.driver = driver.load_compute_driver(self.virtapi, compute_driver)
self.use_legacy_block_device_info = \
self.driver.need_legacy_block_device_info
def reset(self):
LOG.info(_LI('Reloading compute RPC API'))
compute_rpcapi.LAST_VERSION = None
self.compute_rpcapi = compute_rpcapi.ComputeAPI()
def _get_resource_tracker(self, nodename):
rt = self._resource_tracker_dict.get(nodename)
if not rt:
if not self.driver.node_is_available(nodename):
raise exception.NovaException(
_("%s is not a valid node managed by this "
"compute host.") % nodename)
rt = resource_tracker.ResourceTracker(self.host,
self.driver,
nodename)
self._resource_tracker_dict[nodename] = rt
return rt
def _update_resource_tracker(self, context, instance):
"""Let the resource tracker know that an instance has changed state."""
if (instance.host == self.host and
self.driver.node_is_available(instance.node)):
rt = self._get_resource_tracker(instance.node)
rt.update_usage(context, instance)
def _instance_update(self, context, instance, **kwargs):
"""Update an instance in the database using kwargs as value."""
for k, v in kwargs.items():
setattr(instance, k, v)
instance.save()
self._update_resource_tracker(context, instance)
def _nil_out_instance_obj_host_and_node(self, instance):
# NOTE(jwcroppe): We don't do instance.save() here for performance
# reasons; a call to this is expected to be immediately followed by
# another call that does instance.save(), thus avoiding two writes
# to the database layer.
instance.host = None
instance.node = None
def _set_instance_obj_error_state(self, context, instance,
clean_task_state=False):
try:
instance.vm_state = vm_states.ERROR
if clean_task_state:
instance.task_state = None
instance.save()
except exception.InstanceNotFound:
LOG.debug('Instance has been destroyed from under us while '
'trying to set it to ERROR', instance=instance)
def _get_instances_on_driver(self, context, filters=None):
"""Return a list of instance records for the instances found
on the hypervisor which satisfy the specified filters. If filters=None
return a list of instance records for all the instances found on the
hypervisor.
"""
if not filters:
filters = {}
try:
driver_uuids = self.driver.list_instance_uuids()
if len(driver_uuids) == 0:
# Short circuit, don't waste a DB call
return objects.InstanceList()
filters['uuid'] = driver_uuids
local_instances = objects.InstanceList.get_by_filters(
context, filters, use_slave=True)
return local_instances
except NotImplementedError:
pass
# The driver doesn't support uuids listing, so we'll have
# to brute force.
driver_instances = self.driver.list_instances()
instances = objects.InstanceList.get_by_filters(context, filters,
use_slave=True)
name_map = {instance.name: instance for instance in instances}
local_instances = []
for driver_instance in driver_instances:
instance = name_map.get(driver_instance)
if not instance:
continue
local_instances.append(instance)
return local_instances
def _destroy_evacuated_instances(self, context):
"""Destroys evacuated instances.
While nova-compute was down, the instances running on it could be
evacuated to another host. Check that the instances reported
by the driver are still associated with this host. If they are
not, destroy them, with the exception of instances which are in
the MIGRATING, RESIZE_MIGRATING, RESIZE_MIGRATED, RESIZE_FINISH
task state or RESIZED vm state.
"""
filters = {
'source_compute': self.host,
'status': ['accepted', 'done'],
'migration_type': 'evacuation',
}
evacuations = objects.MigrationList.get_by_filters(context, filters)
if not evacuations:
return
evacuations = {mig.instance_uuid: mig for mig in evacuations}
filters = {'deleted': False}
local_instances = self._get_instances_on_driver(context, filters)
evacuated = [inst for inst in local_instances
if inst.uuid in evacuations]
for instance in evacuated:
migration = evacuations[instance.uuid]
LOG.info(_LI('Deleting instance as it has been evacuated from '
'this host'), instance=instance)
try:
network_info = self.network_api.get_instance_nw_info(
context, instance)
bdi = self._get_instance_block_device_info(context,
instance)
destroy_disks = not (self._is_instance_storage_shared(
context, instance))
except exception.InstanceNotFound:
network_info = network_model.NetworkInfo()
bdi = {}
LOG.info(_LI('Instance has been marked deleted already, '
'removing it from the hypervisor.'),
instance=instance)
# always destroy disks if the instance was deleted
destroy_disks = True
self.driver.destroy(context, instance,
network_info,
bdi, destroy_disks)
migration.status = 'completed'
migration.save()
def _is_instance_storage_shared(self, context, instance, host=None):
shared_storage = True
data = None
try:
data = self.driver.check_instance_shared_storage_local(context,
instance)
if data:
shared_storage = (self.compute_rpcapi.
check_instance_shared_storage(context,
instance, data, host=host))
except NotImplementedError:
LOG.debug('Hypervisor driver does not support '
'instance shared storage check, '
'assuming it\'s not on shared storage',
instance=instance)
shared_storage = False
except Exception:
LOG.exception(_LE('Failed to check if instance shared'),
instance=instance)
finally:
if data:
self.driver.check_instance_shared_storage_cleanup(context,
data)
return shared_storage
def _complete_partial_deletion(self, context, instance):
"""Complete deletion for instances in DELETED status but not marked as
deleted in the DB
"""
system_meta = instance.system_metadata
instance.destroy()
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
quotas = objects.Quotas(context=context)
project_id, user_id = objects.quotas.ids_from_instance(context,
instance)
quotas.reserve(project_id=project_id, user_id=user_id, instances=-1,
cores=-instance.vcpus, ram=-instance.memory_mb)
self._complete_deletion(context,
instance,
bdms,
quotas,
system_meta)
def _complete_deletion(self, context, instance, bdms,
quotas, system_meta):
if quotas:
quotas.commit()
# ensure block device mappings are not leaked
for bdm in bdms:
bdm.destroy()
self._notify_about_instance_usage(context, instance, "delete.end",
system_metadata=system_meta)
self._clean_instance_console_tokens(context, instance)
self._delete_scheduler_instance_info(context, instance.uuid)
def _create_reservations(self, context, instance, project_id, user_id):
vcpus = instance.vcpus
mem_mb = instance.memory_mb
quotas = objects.Quotas(context=context)
quotas.reserve(project_id=project_id,
user_id=user_id,
instances=-1,
cores=-vcpus,
ram=-mem_mb)
return quotas
def _init_instance(self, context, instance):
'''Initialize this instance during service init.'''
# NOTE(danms): If the instance appears to not be owned by this
# host, it may have been evacuated away, but skipped by the
# evacuation cleanup code due to configuration. Thus, if that
# is a possibility, don't touch the instance in any way, but
# log the concern. This will help avoid potential issues on
# startup due to misconfiguration.
if instance.host != self.host:
LOG.warning(_LW('Instance %(uuid)s appears to not be owned '
'by this host, but by %(host)s. Startup '
'processing is being skipped.'),
{'uuid': instance.uuid,
'host': instance.host})
return
# Instances that are shut down, or in an error state can not be
# initialized and are not attempted to be recovered. The exception
# to this are instances that are in RESIZE_MIGRATING or DELETING,
# which are dealt with further down.
if (instance.vm_state == vm_states.SOFT_DELETED or
(instance.vm_state == vm_states.ERROR and
instance.task_state not in
(task_states.RESIZE_MIGRATING, task_states.DELETING))):
LOG.debug("Instance is in %s state.",
instance.vm_state, instance=instance)
return
if instance.vm_state == vm_states.DELETED:
try:
self._complete_partial_deletion(context, instance)
except Exception:
# we don't want that an exception blocks the init_host
msg = _LE('Failed to complete a deletion')
LOG.exception(msg, instance=instance)
return
if (instance.vm_state == vm_states.BUILDING or
instance.task_state in [task_states.SCHEDULING,
task_states.BLOCK_DEVICE_MAPPING,
task_states.NETWORKING,
task_states.SPAWNING]):
# NOTE(dave-mcnally) compute stopped before instance was fully
# spawned so set to ERROR state. This is safe to do as the state
# may be set by the api but the host is not so if we get here the
# instance has already been scheduled to this particular host.
LOG.debug("Instance failed to spawn correctly, "
"setting to ERROR state", instance=instance)
instance.task_state = None
instance.vm_state = vm_states.ERROR
instance.save()
return
if (instance.vm_state in [vm_states.ACTIVE, vm_states.STOPPED] and
instance.task_state in [task_states.REBUILDING,
task_states.REBUILD_BLOCK_DEVICE_MAPPING,
task_states.REBUILD_SPAWNING]):
# NOTE(jichenjc) compute stopped before instance was fully
# spawned so set to ERROR state. This is consistent to BUILD
LOG.debug("Instance failed to rebuild correctly, "
"setting to ERROR state", instance=instance)
instance.task_state = None
instance.vm_state = vm_states.ERROR
instance.save()
return
if (instance.vm_state != vm_states.ERROR and
instance.task_state in [task_states.IMAGE_SNAPSHOT_PENDING,
task_states.IMAGE_PENDING_UPLOAD,
task_states.IMAGE_UPLOADING,
task_states.IMAGE_SNAPSHOT]):
LOG.debug("Instance in transitional state %s at start-up "
"clearing task state",
instance.task_state, instance=instance)
try:
self._post_interrupted_snapshot_cleanup(context, instance)
except Exception:
# we don't want that an exception blocks the init_host
msg = _LE('Failed to cleanup snapshot.')
LOG.exception(msg, instance=instance)
instance.task_state = None
instance.save()
if (instance.vm_state != vm_states.ERROR and
instance.task_state in [task_states.RESIZE_PREP]):
LOG.debug("Instance in transitional state %s at start-up "
"clearing task state",
instance['task_state'], instance=instance)
instance.task_state = None
instance.save()
if instance.task_state == task_states.DELETING:
try:
LOG.info(_LI('Service started deleting the instance during '
'the previous run, but did not finish. Restarting'
' the deletion now.'), instance=instance)
instance.obj_load_attr('metadata')
instance.obj_load_attr('system_metadata')
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
project_id, user_id = objects.quotas.ids_from_instance(
context, instance)
quotas = self._create_reservations(context, instance,
project_id, user_id)
self._delete_instance(context, instance, bdms, quotas)
except Exception:
# we don't want that an exception blocks the init_host
msg = _LE('Failed to complete a deletion')
LOG.exception(msg, instance=instance)
self._set_instance_obj_error_state(context, instance)
return
try_reboot, reboot_type = self._retry_reboot(context, instance)
current_power_state = self._get_power_state(context, instance)
if try_reboot:
LOG.debug("Instance in transitional state (%(task_state)s) at "
"start-up and power state is (%(power_state)s), "
"triggering reboot",
{'task_state': instance.task_state,
'power_state': current_power_state},
instance=instance)
# NOTE(mikal): if the instance was doing a soft reboot that got as
# far as shutting down the instance but not as far as starting it
# again, then we've just become a hard reboot. That means the
# task state for the instance needs to change so that we're in one
# of the expected task states for a hard reboot.
soft_types = [task_states.REBOOT_STARTED,
task_states.REBOOT_PENDING,
task_states.REBOOTING]
if instance.task_state in soft_types and reboot_type == 'HARD':
instance.task_state = task_states.REBOOT_PENDING_HARD
instance.save()
self.reboot_instance(context, instance, block_device_info=None,
reboot_type=reboot_type)
return
elif (current_power_state == power_state.RUNNING and
instance.task_state in [task_states.REBOOT_STARTED,
task_states.REBOOT_STARTED_HARD,
task_states.PAUSING,
task_states.UNPAUSING]):
LOG.warning(_LW("Instance in transitional state "
"(%(task_state)s) at start-up and power state "
"is (%(power_state)s), clearing task state"),
{'task_state': instance.task_state,
'power_state': current_power_state},
instance=instance)
instance.task_state = None
instance.vm_state = vm_states.ACTIVE
instance.save()
elif (current_power_state == power_state.PAUSED and
instance.task_state == task_states.UNPAUSING):
LOG.warning(_LW("Instance in transitional state "
"(%(task_state)s) at start-up and power state "
"is (%(power_state)s), clearing task state "
"and unpausing the instance"),
{'task_state': instance.task_state,
'power_state': current_power_state},
instance=instance)
try:
self.unpause_instance(context, instance)
except NotImplementedError:
# Some virt driver didn't support pause and unpause
pass
except Exception:
LOG.exception(_LE('Failed to unpause instance'),
instance=instance)
return
if instance.task_state == task_states.POWERING_OFF:
try:
LOG.debug("Instance in transitional state %s at start-up "
"retrying stop request",
instance.task_state, instance=instance)
self.stop_instance(context, instance, True)
except Exception:
# we don't want that an exception blocks the init_host
msg = _LE('Failed to stop instance')
LOG.exception(msg, instance=instance)
return
if instance.task_state == task_states.POWERING_ON:
try:
LOG.debug("Instance in transitional state %s at start-up "
"retrying start request",
instance.task_state, instance=instance)
self.start_instance(context, instance)
except Exception:
# we don't want that an exception blocks the init_host
msg = _LE('Failed to start instance')
LOG.exception(msg, instance=instance)
return
net_info = compute_utils.get_nw_info_for_instance(instance)
try:
self.driver.plug_vifs(instance, net_info)
except NotImplementedError as e:
LOG.debug(e, instance=instance)
except exception.VirtualInterfacePlugException:
# we don't want an exception to block the init_host
LOG.exception(_LE("Vifs plug failed"), instance=instance)
self._set_instance_obj_error_state(context, instance)
return
if instance.task_state == task_states.RESIZE_MIGRATING:
# We crashed during resize/migration, so roll back for safety
try:
# NOTE(mriedem): check old_vm_state for STOPPED here, if it's
# not in system_metadata we default to True for backwards
# compatibility
power_on = (instance.system_metadata.get('old_vm_state') !=
vm_states.STOPPED)
block_dev_info = self._get_instance_block_device_info(context,
instance)
self.driver.finish_revert_migration(context,
instance, net_info, block_dev_info, power_on)
except Exception:
LOG.exception(_LE('Failed to revert crashed migration'),
instance=instance)
finally:
LOG.info(_LI('Instance found in migrating state during '
'startup. Resetting task_state'),
instance=instance)
instance.task_state = None
instance.save()
if instance.task_state == task_states.MIGRATING:
# Live migration did not complete, but instance is on this
# host, so reset the state.
instance.task_state = None
instance.save(expected_task_state=[task_states.MIGRATING])
db_state = instance.power_state
drv_state = self._get_power_state(context, instance)
expect_running = (db_state == power_state.RUNNING and
drv_state != db_state)
LOG.debug('Current state is %(drv_state)s, state in DB is '
'%(db_state)s.',
{'drv_state': drv_state, 'db_state': db_state},
instance=instance)
if expect_running and CONF.resume_guests_state_on_host_boot:
LOG.info(_LI('Rebooting instance after nova-compute restart.'),
instance=instance)
block_device_info = \
self._get_instance_block_device_info(context, instance)
try:
self.driver.resume_state_on_host_boot(
context, instance, net_info, block_device_info)
except NotImplementedError:
LOG.warning(_LW('Hypervisor driver does not support '
'resume guests'), instance=instance)
except Exception:
# NOTE(vish): The instance failed to resume, so we set the
# instance to error and attempt to continue.
LOG.warning(_LW('Failed to resume instance'),
instance=instance)
self._set_instance_obj_error_state(context, instance)
elif drv_state == power_state.RUNNING:
# VMwareAPI drivers will raise an exception
try:
self.driver.ensure_filtering_rules_for_instance(
instance, net_info)
except NotImplementedError:
LOG.debug('Hypervisor driver does not support '
'firewall rules', instance=instance)
def _retry_reboot(self, context, instance):
current_power_state = self._get_power_state(context, instance)
current_task_state = instance.task_state
retry_reboot = False
reboot_type = compute_utils.get_reboot_type(current_task_state,
current_power_state)
pending_soft = (current_task_state == task_states.REBOOT_PENDING and
instance.vm_state in vm_states.ALLOW_SOFT_REBOOT)
pending_hard = (current_task_state == task_states.REBOOT_PENDING_HARD
and instance.vm_state in vm_states.ALLOW_HARD_REBOOT)
started_not_running = (current_task_state in
[task_states.REBOOT_STARTED,
task_states.REBOOT_STARTED_HARD] and
current_power_state != power_state.RUNNING)
if pending_soft or pending_hard or started_not_running:
retry_reboot = True
return retry_reboot, reboot_type
def handle_lifecycle_event(self, event):
LOG.info(_LI("VM %(state)s (Lifecycle Event)"),
{'state': event.get_name()},
instance_uuid=event.get_instance_uuid())
context = nova.context.get_admin_context(read_deleted='yes')
instance = objects.Instance.get_by_uuid(context,
event.get_instance_uuid(),
expected_attrs=[])
vm_power_state = None
if event.get_transition() == virtevent.EVENT_LIFECYCLE_STOPPED:
vm_power_state = power_state.SHUTDOWN
elif event.get_transition() == virtevent.EVENT_LIFECYCLE_STARTED:
vm_power_state = power_state.RUNNING
elif event.get_transition() == virtevent.EVENT_LIFECYCLE_PAUSED:
vm_power_state = power_state.PAUSED
elif event.get_transition() == virtevent.EVENT_LIFECYCLE_RESUMED:
vm_power_state = power_state.RUNNING
elif event.get_transition() == virtevent.EVENT_LIFECYCLE_SUSPENDED:
vm_power_state = power_state.SUSPENDED
else:
LOG.warning(_LW("Unexpected power state %d"),
event.get_transition())
# Note(lpetrut): The event may be delayed, thus not reflecting
# the current instance power state. In that case, ignore the event.
current_power_state = self._get_power_state(context, instance)
if current_power_state == vm_power_state:
LOG.debug('Synchronizing instance power state after lifecycle '
'event "%(event)s"; current vm_state: %(vm_state)s, '
'current task_state: %(task_state)s, current DB '
'power_state: %(db_power_state)s, VM power_state: '
'%(vm_power_state)s',
{'event': event.get_name(),
'vm_state': instance.vm_state,
'task_state': instance.task_state,
'db_power_state': instance.power_state,
'vm_power_state': vm_power_state},
instance_uuid=instance.uuid)
self._sync_instance_power_state(context,
instance,
vm_power_state)
def handle_events(self, event):
if isinstance(event, virtevent.LifecycleEvent):
try:
self.handle_lifecycle_event(event)
except exception.InstanceNotFound:
LOG.debug("Event %s arrived for non-existent instance. The "
"instance was probably deleted.", event)
else:
LOG.debug("Ignoring event %s", event)
def init_virt_events(self):
if CONF.workarounds.handle_virt_lifecycle_events:
self.driver.register_event_listener(self.handle_events)
else:
# NOTE(mriedem): If the _sync_power_states periodic task is
# disabled we should emit a warning in the logs.
if CONF.sync_power_state_interval < 0:
LOG.warning(_LW('Instance lifecycle events from the compute '
'driver have been disabled. Note that lifecycle '
'changes to an instance outside of the compute '
'service will not be synchronized '
'automatically since the _sync_power_states '
'periodic task is also disabled.'))
else:
LOG.info(_LI('Instance lifecycle events from the compute '
'driver have been disabled. Note that lifecycle '
'changes to an instance outside of the compute '
'service will only be synchronized by the '
'_sync_power_states periodic task.'))
def init_host(self):
"""Initialization for a standalone compute service."""
self.driver.init_host(host=self.host)
context = nova.context.get_admin_context()
instances = objects.InstanceList.get_by_host(
context, self.host, expected_attrs=['info_cache', 'metadata'])
if CONF.defer_iptables_apply:
self.driver.filter_defer_apply_on()
self.init_virt_events()
try:
# checking that instance was not already evacuated to other host
self._destroy_evacuated_instances(context)
for instance in instances:
self._init_instance(context, instance)
finally:
if CONF.defer_iptables_apply:
self.driver.filter_defer_apply_off()
self._update_scheduler_instance_info(context, instances)
def cleanup_host(self):
self.driver.register_event_listener(None)
self.instance_events.cancel_all_events()
self.driver.cleanup_host(host=self.host)
def pre_start_hook(self):
"""After the service is initialized, but before we fully bring
the service up by listening on RPC queues, make sure to update
our available resources (and indirectly our available nodes).
"""
self.update_available_resource(nova.context.get_admin_context())
def _get_power_state(self, context, instance):
"""Retrieve the power state for the given instance."""
LOG.debug('Checking state', instance=instance)
try:
return self.driver.get_info(instance).state
except exception.InstanceNotFound:
return power_state.NOSTATE
def get_console_topic(self, context):
"""Retrieves the console host for a project on this host.
Currently this is just set in the flags for each compute host.
"""
# TODO(mdragon): perhaps make this variable by console_type?
return '%s.%s' % (CONF.console_topic, CONF.console_host)
@wrap_exception()
def get_console_pool_info(self, context, console_type):
return self.driver.get_console_pool_info(console_type)
# NOTE(hanlind): This and the virt method it calls can be removed in
# version 5.0 of the RPC API
@wrap_exception()
def refresh_security_group_rules(self, context, security_group_id):
"""Tell the virtualization driver to refresh security group rules.
Passes straight through to the virtualization driver.
"""
return self.driver.refresh_security_group_rules(security_group_id)
@object_compat
@wrap_exception()
def refresh_instance_security_rules(self, context, instance):
"""Tell the virtualization driver to refresh security rules for
an instance.
Passes straight through to the virtualization driver.
Synchronise the call because we may still be in the middle of
creating the instance.
"""
@utils.synchronized(instance.uuid)
def _sync_refresh():
try:
return self.driver.refresh_instance_security_rules(instance)
except NotImplementedError:
LOG.debug('Hypervisor driver does not support '
'security groups.', instance=instance)
return _sync_refresh()
def _await_block_device_map_created(self, context, vol_id):
# TODO(yamahata): creating volume simultaneously
# reduces creation time?
# TODO(yamahata): eliminate dumb polling
start = time.time()
retries = CONF.block_device_allocate_retries
if retries < 0:
LOG.warning(_LW("Treating negative config value (%(retries)s) for "
"'block_device_retries' as 0."),
{'retries': retries})
# (1) treat negative config value as 0
# (2) the configured value is 0, one attempt should be made
# (3) the configured value is > 0, then the total number attempts
# is (retries + 1)
attempts = 1
if retries >= 1:
attempts = retries + 1
for attempt in range(1, attempts + 1):
volume = self.volume_api.get(context, vol_id)
volume_status = volume['status']
if volume_status not in ['creating', 'downloading']:
if volume_status == 'available':
return attempt
LOG.warning(_LW("Volume id: %(vol_id)s finished being "
"created but its status is %(vol_status)s."),
{'vol_id': vol_id,
'vol_status': volume_status})
break
greenthread.sleep(CONF.block_device_allocate_retries_interval)
raise exception.VolumeNotCreated(volume_id=vol_id,
seconds=int(time.time() - start),
attempts=attempt,
volume_status=volume_status)
def _decode_files(self, injected_files):
"""Base64 decode the list of files to inject."""
if not injected_files:
return []
def _decode(f):
path, contents = f
try:
decoded = base64.b64decode(contents)
return path, decoded
except TypeError:
raise exception.Base64Exception(path=path)
return [_decode(f) for f in injected_files]
def _validate_instance_group_policy(self, context, instance,
filter_properties):
# NOTE(russellb) Instance group policy is enforced by the scheduler.
# However, there is a race condition with the enforcement of
# the policy. Since more than one instance may be scheduled at the
# same time, it's possible that more than one instance with an
# anti-affinity policy may end up here. It's also possible that
# multiple instances with an affinity policy could end up on different
# hosts. This is a validation step to make sure that starting the
# instance here doesn't violate the policy.
scheduler_hints = filter_properties.get('scheduler_hints') or {}
group_hint = scheduler_hints.get('group')
if not group_hint:
return
@utils.synchronized(group_hint)
def _do_validation(context, instance, group_hint):
group = objects.InstanceGroup.get_by_hint(context, group_hint)
if 'anti-affinity' in group.policies:
group_hosts = group.get_hosts(exclude=[instance.uuid])
if self.host in group_hosts:
msg = _("Anti-affinity instance group policy "
"was violated.")
raise exception.RescheduledException(
instance_uuid=instance.uuid,
reason=msg)
elif 'affinity' in group.policies:
group_hosts = group.get_hosts(exclude=[instance.uuid])
if group_hosts and self.host not in group_hosts:
msg = _("Affinity instance group policy was violated.")
raise exception.RescheduledException(
instance_uuid=instance.uuid,
reason=msg)
_do_validation(context, instance, group_hint)
def _log_original_error(self, exc_info, instance_uuid):
LOG.error(_LE('Error: %s'), exc_info[1], instance_uuid=instance_uuid,
exc_info=exc_info)
def _reschedule(self, context, request_spec, filter_properties,
instance, reschedule_method, method_args, task_state,
exc_info=None):
"""Attempt to re-schedule a compute operation."""
instance_uuid = instance.uuid
retry = filter_properties.get('retry')
if not retry:
# no retry information, do not reschedule.
LOG.debug("Retry info not present, will not reschedule",
instance_uuid=instance_uuid)
return
if not request_spec:
LOG.debug("No request spec, will not reschedule",
instance_uuid=instance_uuid)
return
LOG.debug("Re-scheduling %(method)s: attempt %(num)d",
{'method': reschedule_method.__name__,
'num': retry['num_attempts']}, instance_uuid=instance_uuid)
# reset the task state:
self._instance_update(context, instance, task_state=task_state)
if exc_info:
# stringify to avoid circular ref problem in json serialization:
retry['exc'] = traceback.format_exception_only(exc_info[0],
exc_info[1])
reschedule_method(context, *method_args)
return True
@periodic_task.periodic_task
def _check_instance_build_time(self, context):
"""Ensure that instances are not stuck in build."""
timeout = CONF.instance_build_timeout
if timeout == 0:
return
filters = {'vm_state': vm_states.BUILDING,
'host': self.host}
building_insts = objects.InstanceList.get_by_filters(context,
filters, expected_attrs=[], use_slave=True)
for instance in building_insts:
if timeutils.is_older_than(instance.created_at, timeout):
self._set_instance_obj_error_state(context, instance)
LOG.warning(_LW("Instance build timed out. Set to error "
"state."), instance=instance)
def _check_instance_exists(self, context, instance):
"""Ensure an instance with the same name is not already present."""
if self.driver.instance_exists(instance):
raise exception.InstanceExists(name=instance.name)
def _allocate_network_async(self, context, instance, requested_networks,
macs, security_groups, is_vpn, dhcp_options):
"""Method used to allocate networks in the background.
Broken out for testing.
"""
LOG.debug("Allocating IP information in the background.",
instance=instance)
retries = CONF.network_allocate_retries
if retries < 0:
LOG.warning(_LW("Treating negative config value (%(retries)s) for "
"'network_allocate_retries' as 0."),
{'retries': retries})
retries = 0
attempts = retries + 1
retry_time = 1
bind_host_id = self.driver.network_binding_host_id(context, instance)
for attempt in range(1, attempts + 1):
try:
nwinfo = self.network_api.allocate_for_instance(
context, instance, vpn=is_vpn,
requested_networks=requested_networks,
macs=macs,
security_groups=security_groups,
dhcp_options=dhcp_options,
bind_host_id=bind_host_id)
LOG.debug('Instance network_info: |%s|', nwinfo,
instance=instance)
instance.system_metadata['network_allocated'] = 'True'
# NOTE(JoshNang) do not save the instance here, as it can cause
# races. The caller shares a reference to instance and waits
# for this async greenthread to finish before calling
# instance.save().
return nwinfo
except Exception:
exc_info = sys.exc_info()
log_info = {'attempt': attempt,
'attempts': attempts}
if attempt == attempts:
LOG.exception(_LE('Instance failed network setup '
'after %(attempts)d attempt(s)'),
log_info)
six.reraise(*exc_info)
LOG.warning(_LW('Instance failed network setup '
'(attempt %(attempt)d of %(attempts)d)'),
log_info, instance=instance)
time.sleep(retry_time)
retry_time *= 2
if retry_time > 30:
retry_time = 30
# Not reached.
def _build_networks_for_instance(self, context, instance,
requested_networks, security_groups):
# If we're here from a reschedule the network may already be allocated.
if strutils.bool_from_string(
instance.system_metadata.get('network_allocated', 'False')):
# NOTE(alex_xu): The network_allocated is True means the network
# resource already allocated at previous scheduling, and the
# network setup is cleanup at previous. After rescheduling, the
# network resource need setup on the new host.
self.network_api.setup_instance_network_on_host(
context, instance, instance.host)
return self.network_api.get_instance_nw_info(context, instance)
if not self.is_neutron_security_groups:
security_groups = []
macs = self.driver.macs_for_instance(instance)
dhcp_options = self.driver.dhcp_options_for_instance(instance)
network_info = self._allocate_network(context, instance,
requested_networks, macs, security_groups, dhcp_options)
return network_info
def _allocate_network(self, context, instance, requested_networks, macs,
security_groups, dhcp_options):
"""Start network allocation asynchronously. Return an instance
of NetworkInfoAsyncWrapper that can be used to retrieve the
allocated networks when the operation has finished.
"""
# NOTE(comstud): Since we're allocating networks asynchronously,
# this task state has little meaning, as we won't be in this
# state for very long.
instance.vm_state = vm_states.BUILDING
instance.task_state = task_states.NETWORKING
instance.save(expected_task_state=[None])
self._update_resource_tracker(context, instance)
is_vpn = pipelib.is_vpn_image(instance.image_ref)
return network_model.NetworkInfoAsyncWrapper(
self._allocate_network_async, context, instance,
requested_networks, macs, security_groups, is_vpn,
dhcp_options)
def _default_root_device_name(self, instance, image_meta, root_bdm):
try:
return self.driver.default_root_device_name(instance,
image_meta,
root_bdm)
except NotImplementedError:
return compute_utils.get_next_device_name(instance, [])
def _default_device_names_for_instance(self, instance,
root_device_name,
*block_device_lists):
try:
self.driver.default_device_names_for_instance(instance,
root_device_name,
*block_device_lists)
except NotImplementedError:
compute_utils.default_device_names_for_instance(
instance, root_device_name, *block_device_lists)
def _get_device_name_for_instance(self, instance, bdms, block_device_obj):
# NOTE(ndipanov): Copy obj to avoid changing the original
block_device_obj = block_device_obj.obj_clone()
try:
return self.driver.get_device_name_for_instance(
instance, bdms, block_device_obj)
except NotImplementedError:
return compute_utils.get_device_name_for_instance(
instance, bdms, block_device_obj.get("device_name"))
def _default_block_device_names(self, context, instance,
image_meta, block_devices):
"""Verify that all the devices have the device_name set. If not,
provide a default name.
It also ensures that there is a root_device_name and is set to the
first block device in the boot sequence (boot_index=0).
"""
root_bdm = block_device.get_root_bdm(block_devices)
if not root_bdm:
return
# Get the root_device_name from the root BDM or the instance
root_device_name = None
update_root_bdm = False
if root_bdm.device_name:
root_device_name = root_bdm.device_name
instance.root_device_name = root_device_name
elif instance.root_device_name:
root_device_name = instance.root_device_name
root_bdm.device_name = root_device_name
update_root_bdm = True
else:
root_device_name = self._default_root_device_name(instance,
image_meta,
root_bdm)
instance.root_device_name = root_device_name
root_bdm.device_name = root_device_name
update_root_bdm = True
if update_root_bdm:
root_bdm.save()
ephemerals = list(filter(block_device.new_format_is_ephemeral,
block_devices))
swap = list(filter(block_device.new_format_is_swap,
block_devices))
block_device_mapping = list(filter(
driver_block_device.is_block_device_mapping, block_devices))
self._default_device_names_for_instance(instance,
root_device_name,
ephemerals,
swap,
block_device_mapping)
def _block_device_info_to_legacy(self, block_device_info):
"""Convert BDI to the old format for drivers that need it."""
if self.use_legacy_block_device_info:
ephemerals = driver_block_device.legacy_block_devices(
driver.block_device_info_get_ephemerals(block_device_info))
mapping = driver_block_device.legacy_block_devices(
driver.block_device_info_get_mapping(block_device_info))
swap = block_device_info['swap']
if swap:
swap = swap.legacy()
block_device_info.update({
'ephemerals': ephemerals,
'swap': swap,
'block_device_mapping': mapping})
def _check_dev_name(self, bdms, instance):
bdms_no_device_name = [x for x in bdms if x.device_name is None]
for bdm in bdms_no_device_name:
device_name = self._get_device_name_for_instance(instance,
bdms,
bdm)
values = {'device_name': device_name}
bdm.update(values)
def _prep_block_device(self, context, instance, bdms,
do_check_attach=True):
"""Set up the block device for an instance with error logging."""
try:
self._check_dev_name(bdms, instance)
block_device_info = driver.get_block_device_info(instance, bdms)
mapping = driver.block_device_info_get_mapping(block_device_info)
driver_block_device.attach_block_devices(
mapping, context, instance, self.volume_api, self.driver,
do_check_attach=do_check_attach,
wait_func=self._await_block_device_map_created)
self._block_device_info_to_legacy(block_device_info)
return block_device_info
except exception.OverQuota:
msg = _LW('Failed to create block device for instance due to '
'being over volume resource quota')
LOG.warning(msg, instance=instance)
raise exception.VolumeLimitExceeded()
except Exception:
LOG.exception(_LE('Instance failed block device setup'),
instance=instance)
raise exception.InvalidBDM()
def _update_instance_after_spawn(self, context, instance):
instance.power_state = self._get_power_state(context, instance)
instance.vm_state = vm_states.ACTIVE
instance.task_state = None
instance.launched_at = timeutils.utcnow()
configdrive.update_instance(instance)
def _update_scheduler_instance_info(self, context, instance):
"""Sends an InstanceList with created or updated Instance objects to
the Scheduler client.
In the case of init_host, the value passed will already be an
InstanceList. Other calls will send individual Instance objects that
have been created or resized. In this case, we create an InstanceList
object containing that Instance.
"""
if not self.send_instance_updates:
return
if isinstance(instance, obj_instance.Instance):
instance = objects.InstanceList(objects=[instance])
context = context.elevated()
self.scheduler_client.update_instance_info(context, self.host,
instance)
def _delete_scheduler_instance_info(self, context, instance_uuid):
"""Sends the uuid of the deleted Instance to the Scheduler client."""
if not self.send_instance_updates:
return
context = context.elevated()
self.scheduler_client.delete_instance_info(context, self.host,
instance_uuid)
@periodic_task.periodic_task(spacing=CONF.scheduler_instance_sync_interval)
def _sync_scheduler_instance_info(self, context):
if not self.send_instance_updates:
return
context = context.elevated()
instances = objects.InstanceList.get_by_host(context, self.host,
expected_attrs=[],
use_slave=True)
uuids = [instance.uuid for instance in instances]
self.scheduler_client.sync_instance_info(context, self.host, uuids)
def _notify_about_instance_usage(self, context, instance, event_suffix,
network_info=None, system_metadata=None,
extra_usage_info=None, fault=None):
compute_utils.notify_about_instance_usage(
self.notifier, context, instance, event_suffix,
network_info=network_info,
system_metadata=system_metadata,
extra_usage_info=extra_usage_info, fault=fault)
def _deallocate_network(self, context, instance,
requested_networks=None):
LOG.debug('Deallocating network for instance', instance=instance)
with timeutils.StopWatch() as timer:
self.network_api.deallocate_for_instance(
context, instance, requested_networks=requested_networks)
# nova-network does an rpc call so we're OK tracking time spent here
LOG.info(_LI('Took %0.2f seconds to deallocate network for instance.'),
timer.elapsed(), instance=instance)
def _get_instance_block_device_info(self, context, instance,
refresh_conn_info=False,
bdms=None):
"""Transform block devices to the driver block_device format."""
if not bdms:
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
block_device_info = driver.get_block_device_info(instance, bdms)
if not refresh_conn_info:
# if the block_device_mapping has no value in connection_info
# (returned as None), don't include in the mapping
block_device_info['block_device_mapping'] = [
bdm for bdm in driver.block_device_info_get_mapping(
block_device_info)
if bdm.get('connection_info')]
else:
driver_block_device.refresh_conn_infos(
driver.block_device_info_get_mapping(block_device_info),
context, instance, self.volume_api, self.driver)
self._block_device_info_to_legacy(block_device_info)
return block_device_info
@wrap_exception()
@reverts_task_state
@wrap_instance_fault
def build_and_run_instance(self, context, instance, image, request_spec,
filter_properties, admin_password=None,
injected_files=None, requested_networks=None,
security_groups=None, block_device_mapping=None,
node=None, limits=None):
@utils.synchronized(instance.uuid)
def _locked_do_build_and_run_instance(*args, **kwargs):
# NOTE(danms): We grab the semaphore with the instance uuid
# locked because we could wait in line to build this instance
# for a while and we want to make sure that nothing else tries
# to do anything with this instance while we wait.
with self._build_semaphore:
self._do_build_and_run_instance(*args, **kwargs)
# NOTE(danms): We spawn here to return the RPC worker thread back to
# the pool. Since what follows could take a really long time, we don't
# want to tie up RPC workers.
utils.spawn_n(_locked_do_build_and_run_instance,
context, instance, image, request_spec,
filter_properties, admin_password, injected_files,
requested_networks, security_groups,
block_device_mapping, node, limits)
@hooks.add_hook('build_instance')
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def _do_build_and_run_instance(self, context, instance, image,
request_spec, filter_properties, admin_password, injected_files,
requested_networks, security_groups, block_device_mapping,
node=None, limits=None):
try:
LOG.debug('Starting instance...', context=context,
instance=instance)
instance.vm_state = vm_states.BUILDING
instance.task_state = None
instance.save(expected_task_state=
(task_states.SCHEDULING, None))
except exception.InstanceNotFound:
msg = 'Instance disappeared before build.'
LOG.debug(msg, instance=instance)
return build_results.FAILED
except exception.UnexpectedTaskStateError as e:
LOG.debug(e.format_message(), instance=instance)
return build_results.FAILED
# b64 decode the files to inject:
decoded_files = self._decode_files(injected_files)
if limits is None:
limits = {}
if node is None:
node = self.driver.get_available_nodes(refresh=True)[0]
LOG.debug('No node specified, defaulting to %s', node,
instance=instance)
try:
with timeutils.StopWatch() as timer:
self._build_and_run_instance(context, instance, image,
decoded_files, admin_password, requested_networks,
security_groups, block_device_mapping, node, limits,
filter_properties)
LOG.info(_LI('Took %0.2f seconds to build instance.'),
timer.elapsed(), instance=instance)
return build_results.ACTIVE
except exception.RescheduledException as e:
retry = filter_properties.get('retry')
if not retry:
# no retry information, do not reschedule.
LOG.debug("Retry info not present, will not reschedule",
instance=instance)
self._cleanup_allocated_networks(context, instance,
requested_networks)
compute_utils.add_instance_fault_from_exc(context,
instance, e, sys.exc_info(),
fault_message=e.kwargs['reason'])
self._nil_out_instance_obj_host_and_node(instance)
self._set_instance_obj_error_state(context, instance,
clean_task_state=True)
return build_results.FAILED
LOG.debug(e.format_message(), instance=instance)
# This will be used for logging the exception
retry['exc'] = traceback.format_exception(*sys.exc_info())
# This will be used for setting the instance fault message
retry['exc_reason'] = e.kwargs['reason']
# NOTE(comstud): Deallocate networks if the driver wants
# us to do so.
if self.driver.deallocate_networks_on_reschedule(instance):
self._cleanup_allocated_networks(context, instance,
requested_networks)
else:
# NOTE(alex_xu): Network already allocated and we don't
# want to deallocate them before rescheduling. But we need
# to cleanup those network resources setup on this host before
# rescheduling.
self.network_api.cleanup_instance_network_on_host(
context, instance, self.host)
self._nil_out_instance_obj_host_and_node(instance)
instance.task_state = task_states.SCHEDULING
instance.save()
self.compute_task_api.build_instances(context, [instance],
image, filter_properties, admin_password,
injected_files, requested_networks, security_groups,
block_device_mapping)
return build_results.RESCHEDULED
except (exception.InstanceNotFound,
exception.UnexpectedDeletingTaskStateError):
msg = 'Instance disappeared during build.'
LOG.debug(msg, instance=instance)
self._cleanup_allocated_networks(context, instance,
requested_networks)
return build_results.FAILED
except exception.BuildAbortException as e:
LOG.exception(e.format_message(), instance=instance)
self._cleanup_allocated_networks(context, instance,
requested_networks)
self._cleanup_volumes(context, instance.uuid,
block_device_mapping, raise_exc=False)
compute_utils.add_instance_fault_from_exc(context, instance,
e, sys.exc_info())
self._nil_out_instance_obj_host_and_node(instance)
self._set_instance_obj_error_state(context, instance,
clean_task_state=True)
return build_results.FAILED
except Exception as e:
# Should not reach here.
msg = _LE('Unexpected build failure, not rescheduling build.')
LOG.exception(msg, instance=instance)
self._cleanup_allocated_networks(context, instance,
requested_networks)
self._cleanup_volumes(context, instance.uuid,
block_device_mapping, raise_exc=False)
compute_utils.add_instance_fault_from_exc(context, instance,
e, sys.exc_info())
self._nil_out_instance_obj_host_and_node(instance)
self._set_instance_obj_error_state(context, instance,
clean_task_state=True)
return build_results.FAILED
def _build_and_run_instance(self, context, instance, image, injected_files,
admin_password, requested_networks, security_groups,
block_device_mapping, node, limits, filter_properties):
image_name = image.get('name')
self._notify_about_instance_usage(context, instance, 'create.start',
extra_usage_info={'image_name': image_name})
try:
rt = self._get_resource_tracker(node)
with rt.instance_claim(context, instance, limits):
# NOTE(russellb) It's important that this validation be done
# *after* the resource tracker instance claim, as that is where
# the host is set on the instance.
self._validate_instance_group_policy(context, instance,
filter_properties)
image_meta = objects.ImageMeta.from_dict(image)
with self._build_resources(context, instance,
requested_networks, security_groups, image_meta,
block_device_mapping) as resources:
instance.vm_state = vm_states.BUILDING
instance.task_state = task_states.SPAWNING
# NOTE(JoshNang) This also saves the changes to the
# instance from _allocate_network_async, as they aren't
# saved in that function to prevent races.
instance.save(expected_task_state=
task_states.BLOCK_DEVICE_MAPPING)
block_device_info = resources['block_device_info']
network_info = resources['network_info']
LOG.debug('Start spawning the instance on the hypervisor.',
instance=instance)
with timeutils.StopWatch() as timer:
self.driver.spawn(context, instance, image_meta,
injected_files, admin_password,
network_info=network_info,
block_device_info=block_device_info)
LOG.info(_LI('Took %0.2f seconds to spawn the instance on '
'the hypervisor.'), timer.elapsed(),
instance=instance)
except (exception.InstanceNotFound,
exception.UnexpectedDeletingTaskStateError) as e:
with excutils.save_and_reraise_exception():
self._notify_about_instance_usage(context, instance,
'create.end', fault=e)
except exception.ComputeResourcesUnavailable as e:
LOG.debug(e.format_message(), instance=instance)
self._notify_about_instance_usage(context, instance,
'create.error', fault=e)
raise exception.RescheduledException(
instance_uuid=instance.uuid, reason=e.format_message())
except exception.BuildAbortException as e:
with excutils.save_and_reraise_exception():
LOG.debug(e.format_message(), instance=instance)
self._notify_about_instance_usage(context, instance,
'create.error', fault=e)
except (exception.FixedIpLimitExceeded,
exception.NoMoreNetworks, exception.NoMoreFixedIps) as e:
LOG.warning(_LW('No more network or fixed IP to be allocated'),
instance=instance)
self._notify_about_instance_usage(context, instance,
'create.error', fault=e)
msg = _('Failed to allocate the network(s) with error %s, '
'not rescheduling.') % e.format_message()
raise exception.BuildAbortException(instance_uuid=instance.uuid,
reason=msg)
except (exception.VirtualInterfaceCreateException,
exception.VirtualInterfaceMacAddressException) as e:
LOG.exception(_LE('Failed to allocate network(s)'),
instance=instance)
self._notify_about_instance_usage(context, instance,
'create.error', fault=e)
msg = _('Failed to allocate the network(s), not rescheduling.')
raise exception.BuildAbortException(instance_uuid=instance.uuid,
reason=msg)
except (exception.FlavorDiskTooSmall,
exception.FlavorMemoryTooSmall,
exception.ImageNotActive,
exception.ImageUnacceptable,
exception.InvalidDiskInfo) as e:
self._notify_about_instance_usage(context, instance,
'create.error', fault=e)
raise exception.BuildAbortException(instance_uuid=instance.uuid,
reason=e.format_message())
except Exception as e:
self._notify_about_instance_usage(context, instance,
'create.error', fault=e)
raise exception.RescheduledException(
instance_uuid=instance.uuid, reason=six.text_type(e))
# NOTE(alaski): This is only useful during reschedules, remove it now.
instance.system_metadata.pop('network_allocated', None)
# If CONF.default_access_ip_network_name is set, grab the
# corresponding network and set the access ip values accordingly.
network_name = CONF.default_access_ip_network_name
if (network_name and not instance.access_ip_v4 and
not instance.access_ip_v6):
# Note that when there are multiple ips to choose from, an
# arbitrary one will be chosen.
for vif in network_info:
if vif['network']['label'] == network_name:
for ip in vif.fixed_ips():
if not instance.access_ip_v4 and ip['version'] == 4:
instance.access_ip_v4 = ip['address']
if not instance.access_ip_v6 and ip['version'] == 6:
instance.access_ip_v6 = ip['address']
break
self._update_instance_after_spawn(context, instance)
try:
instance.save(expected_task_state=task_states.SPAWNING)
except (exception.InstanceNotFound,
exception.UnexpectedDeletingTaskStateError) as e:
with excutils.save_and_reraise_exception():
self._notify_about_instance_usage(context, instance,
'create.end', fault=e)
self._update_scheduler_instance_info(context, instance)
self._notify_about_instance_usage(context, instance, 'create.end',
extra_usage_info={'message': _('Success')},
network_info=network_info)
@contextlib.contextmanager
def _build_resources(self, context, instance, requested_networks,
security_groups, image_meta, block_device_mapping):
resources = {}
network_info = None
try:
LOG.debug('Start building networks asynchronously for instance.',
instance=instance)
network_info = self._build_networks_for_instance(context, instance,
requested_networks, security_groups)
resources['network_info'] = network_info
except (exception.InstanceNotFound,
exception.UnexpectedDeletingTaskStateError):
raise
except exception.UnexpectedTaskStateError as e:
raise exception.BuildAbortException(instance_uuid=instance.uuid,
reason=e.format_message())
except Exception:
# Because this allocation is async any failures are likely to occur
# when the driver accesses network_info during spawn().
LOG.exception(_LE('Failed to allocate network(s)'),
instance=instance)
msg = _('Failed to allocate the network(s), not rescheduling.')
raise exception.BuildAbortException(instance_uuid=instance.uuid,
reason=msg)
try:
# Verify that all the BDMs have a device_name set and assign a
# default to the ones missing it with the help of the driver.
self._default_block_device_names(context, instance, image_meta,
block_device_mapping)
LOG.debug('Start building block device mappings for instance.',
instance=instance)
instance.vm_state = vm_states.BUILDING
instance.task_state = task_states.BLOCK_DEVICE_MAPPING
instance.save()
block_device_info = self._prep_block_device(context, instance,
block_device_mapping)
resources['block_device_info'] = block_device_info
except (exception.InstanceNotFound,
exception.UnexpectedDeletingTaskStateError):
with excutils.save_and_reraise_exception():
# Make sure the async call finishes
if network_info is not None:
network_info.wait(do_raise=False)
except (exception.UnexpectedTaskStateError,
exception.VolumeLimitExceeded,
exception.InvalidBDM) as e:
# Make sure the async call finishes
if network_info is not None:
network_info.wait(do_raise=False)
raise exception.BuildAbortException(instance_uuid=instance.uuid,
reason=e.format_message())
except Exception:
LOG.exception(_LE('Failure prepping block device'),
instance=instance)
# Make sure the async call finishes
if network_info is not None:
network_info.wait(do_raise=False)
msg = _('Failure prepping block device.')
raise exception.BuildAbortException(instance_uuid=instance.uuid,
reason=msg)
try:
yield resources
except Exception as exc:
with excutils.save_and_reraise_exception() as ctxt:
if not isinstance(exc, (exception.InstanceNotFound,
exception.UnexpectedDeletingTaskStateError)):
LOG.exception(_LE('Instance failed to spawn'),
instance=instance)
# Make sure the async call finishes
if network_info is not None:
network_info.wait(do_raise=False)
# if network_info is empty we're likely here because of
# network allocation failure. Since nothing can be reused on
# rescheduling it's better to deallocate network to eliminate
# the chance of orphaned ports in neutron
deallocate_networks = False if network_info else True
try:
self._shutdown_instance(context, instance,
block_device_mapping, requested_networks,
try_deallocate_networks=deallocate_networks)
except Exception as exc2:
ctxt.reraise = False
LOG.warning(_LW('Could not clean up failed build,'
' not rescheduling. Error: %s'),
six.text_type(exc2))
raise exception.BuildAbortException(
instance_uuid=instance.uuid,
reason=six.text_type(exc))
def _cleanup_allocated_networks(self, context, instance,
requested_networks):
try:
self._deallocate_network(context, instance, requested_networks)
except Exception:
msg = _LE('Failed to deallocate networks')
LOG.exception(msg, instance=instance)
return
instance.system_metadata['network_allocated'] = 'False'
try:
instance.save()
except exception.InstanceNotFound:
# NOTE(alaski): It's possible that we're cleaning up the networks
# because the instance was deleted. If that's the case then this
# exception will be raised by instance.save()
pass
def _try_deallocate_network(self, context, instance,
requested_networks=None):
try:
# tear down allocated network structure
self._deallocate_network(context, instance, requested_networks)
except Exception:
with excutils.save_and_reraise_exception():
LOG.error(_LE('Failed to deallocate network for instance.'),
instance=instance)
self._set_instance_obj_error_state(context, instance)
def _get_power_off_values(self, context, instance, clean_shutdown):
"""Get the timing configuration for powering down this instance."""
if clean_shutdown:
timeout = compute_utils.get_value_from_system_metadata(instance,
key='image_os_shutdown_timeout', type=int,
default=CONF.shutdown_timeout)
retry_interval = self.SHUTDOWN_RETRY_INTERVAL
else:
timeout = 0
retry_interval = 0
return timeout, retry_interval
def _power_off_instance(self, context, instance, clean_shutdown=True):
"""Power off an instance on this host."""
timeout, retry_interval = self._get_power_off_values(context,
instance, clean_shutdown)
self.driver.power_off(instance, timeout, retry_interval)
def _shutdown_instance(self, context, instance,
bdms, requested_networks=None, notify=True,
try_deallocate_networks=True):
"""Shutdown an instance on this host.
:param:context: security context
:param:instance: a nova.objects.Instance object
:param:bdms: the block devices for the instance to be torn
down
:param:requested_networks: the networks on which the instance
has ports
:param:notify: true if a final usage notification should be
emitted
:param:try_deallocate_networks: false if we should avoid
trying to teardown networking
"""
context = context.elevated()
LOG.info(_LI('%(action_str)s instance') %
{'action_str': 'Terminating'},
context=context, instance=instance)
if notify:
self._notify_about_instance_usage(context, instance,
"shutdown.start")
network_info = compute_utils.get_nw_info_for_instance(instance)
# NOTE(vish) get bdms before destroying the instance
vol_bdms = [bdm for bdm in bdms if bdm.is_volume]
block_device_info = self._get_instance_block_device_info(
context, instance, bdms=bdms)
# NOTE(melwitt): attempt driver destroy before releasing ip, may
# want to keep ip allocated for certain failures
timer = timeutils.StopWatch()
try:
LOG.debug('Start destroying the instance on the hypervisor.',
instance=instance)
timer.start()
self.driver.destroy(context, instance, network_info,
block_device_info)
LOG.info(_LI('Took %0.2f seconds to destroy the instance on the '
'hypervisor.'), timer.elapsed(), instance=instance)
except exception.InstancePowerOffFailure:
# if the instance can't power off, don't release the ip
with excutils.save_and_reraise_exception():
pass
except Exception:
with excutils.save_and_reraise_exception():
# deallocate ip and fail without proceeding to
# volume api calls, preserving current behavior
if try_deallocate_networks:
self._try_deallocate_network(context, instance,
requested_networks)
if try_deallocate_networks:
self._try_deallocate_network(context, instance, requested_networks)
timer.restart()
for bdm in vol_bdms:
try:
# NOTE(vish): actual driver detach done in driver.destroy, so
# just tell cinder that we are done with it.
connector = self.driver.get_volume_connector(instance)
self.volume_api.terminate_connection(context,
bdm.volume_id,
connector)
self.volume_api.detach(context, bdm.volume_id, instance.uuid)
except exception.DiskNotFound as exc:
LOG.debug('Ignoring DiskNotFound: %s', exc,
instance=instance)
except exception.VolumeNotFound as exc:
LOG.debug('Ignoring VolumeNotFound: %s', exc,
instance=instance)
except (cinder_exception.EndpointNotFound,
keystone_exception.EndpointNotFound) as exc:
LOG.warning(_LW('Ignoring EndpointNotFound: %s'), exc,
instance=instance)
except cinder_exception.ClientException as exc:
LOG.warning(_LW('Ignoring Unknown cinder exception: %s'), exc,
instance=instance)
if vol_bdms:
LOG.info(_LI('Took %(time).2f seconds to detach %(num)s volumes '
'for instance.'),
{'time': timer.elapsed(), 'num': len(vol_bdms)},
instance=instance)
if notify:
self._notify_about_instance_usage(context, instance,
"shutdown.end")
def _cleanup_volumes(self, context, instance_uuid, bdms, raise_exc=True):
exc_info = None
for bdm in bdms:
LOG.debug("terminating bdm %s", bdm,
instance_uuid=instance_uuid)
if bdm.volume_id and bdm.delete_on_termination:
try:
self.volume_api.delete(context, bdm.volume_id)
except Exception as exc:
exc_info = sys.exc_info()
LOG.warning(_LW('Failed to delete volume: %(volume_id)s '
'due to %(exc)s'),
{'volume_id': bdm.volume_id, 'exc': exc})
if exc_info is not None and raise_exc:
six.reraise(exc_info[0], exc_info[1], exc_info[2])
@hooks.add_hook("delete_instance")
def _delete_instance(self, context, instance, bdms, quotas):
"""Delete an instance on this host. Commit or rollback quotas
as necessary.
:param context: nova request context
:param instance: nova.objects.instance.Instance object
:param bdms: nova.objects.block_device.BlockDeviceMappingList object
:param quotas: nova.objects.quotas.Quotas object
"""
was_soft_deleted = instance.vm_state == vm_states.SOFT_DELETED
if was_soft_deleted:
# Instances in SOFT_DELETED vm_state have already had quotas
# decremented.
try:
quotas.rollback()
except Exception:
pass
try:
events = self.instance_events.clear_events_for_instance(instance)
if events:
LOG.debug('Events pending at deletion: %(events)s',
{'events': ','.join(events.keys())},
instance=instance)
self._notify_about_instance_usage(context, instance,
"delete.start")
self._shutdown_instance(context, instance, bdms)
# NOTE(dims): instance.info_cache.delete() should be called after
# _shutdown_instance in the compute manager as shutdown calls
# deallocate_for_instance so the info_cache is still needed
# at this point.
if instance.info_cache is not None:
instance.info_cache.delete()
else:
# NOTE(yoshimatsu): Avoid AttributeError if instance.info_cache
# is None. When the root cause that instance.info_cache becomes
# None is fixed, the log level should be reconsidered.
LOG.warning(_LW("Info cache for instance could not be found. "
"Ignore."), instance=instance)
# NOTE(vish): We have already deleted the instance, so we have
# to ignore problems cleaning up the volumes. It
# would be nice to let the user know somehow that
# the volume deletion failed, but it is not
# acceptable to have an instance that can not be
# deleted. Perhaps this could be reworked in the
# future to set an instance fault the first time
# and to only ignore the failure if the instance
# is already in ERROR.
self._cleanup_volumes(context, instance.uuid, bdms,
raise_exc=False)
# if a delete task succeeded, always update vm state and task
# state without expecting task state to be DELETING
instance.vm_state = vm_states.DELETED
instance.task_state = None
instance.power_state = power_state.NOSTATE
instance.terminated_at = timeutils.utcnow()
instance.save()
self._update_resource_tracker(context, instance)
system_meta = instance.system_metadata
instance.destroy()
except Exception:
with excutils.save_and_reraise_exception():
quotas.rollback()
self._complete_deletion(context,
instance,
bdms,
quotas,
system_meta)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def terminate_instance(self, context, instance, bdms, reservations):
"""Terminate an instance on this host."""
quotas = objects.Quotas.from_reservations(context,
reservations,
instance=instance)
@utils.synchronized(instance.uuid)
def do_terminate_instance(instance, bdms):
# NOTE(mriedem): If we are deleting the instance while it was
# booting from volume, we could be racing with a database update of
# the BDM volume_id. Since the compute API passes the BDMs over RPC
# to compute here, the BDMs may be stale at this point. So check
# for any volume BDMs that don't have volume_id set and if we
# detect that, we need to refresh the BDM list before proceeding.
# TODO(mriedem): Move this into _delete_instance and make the bdms
# parameter optional.
for bdm in list(bdms):
if bdm.is_volume and not bdm.volume_id:
LOG.debug('There are potentially stale BDMs during '
'delete, refreshing the BlockDeviceMappingList.',
instance=instance)
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
break
try:
self._delete_instance(context, instance, bdms, quotas)
except exception.InstanceNotFound:
LOG.info(_LI("Instance disappeared during terminate"),
instance=instance)
except Exception:
# As we're trying to delete always go to Error if something
# goes wrong that _delete_instance can't handle.
with excutils.save_and_reraise_exception():
LOG.exception(_LE('Setting instance vm_state to ERROR'),
instance=instance)
self._set_instance_obj_error_state(context, instance)
do_terminate_instance(instance, bdms)
# NOTE(johannes): This is probably better named power_off_instance
# so it matches the driver method, but because of other issues, we
# can't use that name in grizzly.
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def stop_instance(self, context, instance, clean_shutdown):
"""Stopping an instance on this host."""
@utils.synchronized(instance.uuid)
def do_stop_instance():
current_power_state = self._get_power_state(context, instance)
LOG.debug('Stopping instance; current vm_state: %(vm_state)s, '
'current task_state: %(task_state)s, current DB '
'power_state: %(db_power_state)s, current VM '
'power_state: %(current_power_state)s',
{'vm_state': instance.vm_state,
'task_state': instance.task_state,
'db_power_state': instance.power_state,
'current_power_state': current_power_state},
instance_uuid=instance.uuid)
# NOTE(mriedem): If the instance is already powered off, we are
# possibly tearing down and racing with other operations, so we can
# expect the task_state to be None if something else updates the
# instance and we're not locking it.
expected_task_state = [task_states.POWERING_OFF]
# The list of power states is from _sync_instance_power_state.
if current_power_state in (power_state.NOSTATE,
power_state.SHUTDOWN,
power_state.CRASHED):
LOG.info(_LI('Instance is already powered off in the '
'hypervisor when stop is called.'),
instance=instance)
expected_task_state.append(None)
self._notify_about_instance_usage(context, instance,
"power_off.start")
self._power_off_instance(context, instance, clean_shutdown)
instance.power_state = self._get_power_state(context, instance)
instance.vm_state = vm_states.STOPPED
instance.task_state = None
instance.save(expected_task_state=expected_task_state)
self._notify_about_instance_usage(context, instance,
"power_off.end")
do_stop_instance()
def _power_on(self, context, instance):
network_info = self.network_api.get_instance_nw_info(context, instance)
block_device_info = self._get_instance_block_device_info(context,
instance)
self.driver.power_on(context, instance,
network_info,
block_device_info)
def _delete_snapshot_of_shelved_instance(self, context, instance,
snapshot_id):
"""Delete snapshot of shelved instance."""
try:
self.image_api.delete(context, snapshot_id)
except (exception.ImageNotFound,
exception.ImageNotAuthorized) as exc:
LOG.warning(_LW("Failed to delete snapshot "
"from shelved instance (%s)."),
exc.format_message(), instance=instance)
except Exception:
LOG.exception(_LE("Something wrong happened when trying to "
"delete snapshot from shelved instance."),
instance=instance)
# NOTE(johannes): This is probably better named power_on_instance
# so it matches the driver method, but because of other issues, we
# can't use that name in grizzly.
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def start_instance(self, context, instance):
"""Starting an instance on this host."""
self._notify_about_instance_usage(context, instance, "power_on.start")
self._power_on(context, instance)
instance.power_state = self._get_power_state(context, instance)
instance.vm_state = vm_states.ACTIVE
instance.task_state = None
# Delete an image(VM snapshot) for a shelved instance
snapshot_id = instance.system_metadata.get('shelved_image_id')
if snapshot_id:
self._delete_snapshot_of_shelved_instance(context, instance,
snapshot_id)
# Delete system_metadata for a shelved instance
compute_utils.remove_shelved_keys_from_system_metadata(instance)
instance.save(expected_task_state=task_states.POWERING_ON)
self._notify_about_instance_usage(context, instance, "power_on.end")
@messaging.expected_exceptions(NotImplementedError,
exception.NMINotSupported,
exception.InstanceNotRunning)
@wrap_exception()
@wrap_instance_event
@wrap_instance_fault
def trigger_crash_dump(self, context, instance):
"""Trigger crash dump in an instance by injecting NMI."""
self._notify_about_instance_usage(context, instance,
"trigger_crash_dump.start")
# This method does not change task_state and power_state because the
# effect of an NMI depends on user's configuration.
self.driver.inject_nmi(instance)
self._notify_about_instance_usage(context, instance,
"trigger_crash_dump.end")
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def soft_delete_instance(self, context, instance, reservations):
"""Soft delete an instance on this host."""
quotas = objects.Quotas.from_reservations(context,
reservations,
instance=instance)
try:
self._notify_about_instance_usage(context, instance,
"soft_delete.start")
try:
self.driver.soft_delete(instance)
except NotImplementedError:
# Fallback to just powering off the instance if the
# hypervisor doesn't implement the soft_delete method
self.driver.power_off(instance)
instance.power_state = self._get_power_state(context, instance)
instance.vm_state = vm_states.SOFT_DELETED
instance.task_state = None
instance.save(expected_task_state=[task_states.SOFT_DELETING])
except Exception:
with excutils.save_and_reraise_exception():
quotas.rollback()
quotas.commit()
self._notify_about_instance_usage(context, instance, "soft_delete.end")
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def restore_instance(self, context, instance):
"""Restore a soft-deleted instance on this host."""
self._notify_about_instance_usage(context, instance, "restore.start")
try:
self.driver.restore(instance)
except NotImplementedError:
# Fallback to just powering on the instance if the hypervisor
# doesn't implement the restore method
self._power_on(context, instance)
instance.power_state = self._get_power_state(context, instance)
instance.vm_state = vm_states.ACTIVE
instance.task_state = None
instance.save(expected_task_state=task_states.RESTORING)
self._notify_about_instance_usage(context, instance, "restore.end")
@staticmethod
def _set_migration_status(migration, status):
"""Set the status, and guard against a None being passed in.
This is useful as some of the compute RPC calls will not pass
a migration object in older versions. The check can be removed when
we move past 4.x major version of the RPC API.
"""
if migration:
migration.status = status
migration.save()
def _rebuild_default_impl(self, context, instance, image_meta,
injected_files, admin_password, bdms,
detach_block_devices, attach_block_devices,
network_info=None,
recreate=False, block_device_info=None,
preserve_ephemeral=False):
if preserve_ephemeral:
# The default code path does not support preserving ephemeral
# partitions.
raise exception.PreserveEphemeralNotSupported()
if recreate:
detach_block_devices(context, bdms)
else:
self._power_off_instance(context, instance, clean_shutdown=True)
detach_block_devices(context, bdms)
self.driver.destroy(context, instance,
network_info=network_info,
block_device_info=block_device_info)
instance.task_state = task_states.REBUILD_BLOCK_DEVICE_MAPPING
instance.save(expected_task_state=[task_states.REBUILDING])
new_block_device_info = attach_block_devices(context, instance, bdms)
instance.task_state = task_states.REBUILD_SPAWNING
instance.save(
expected_task_state=[task_states.REBUILD_BLOCK_DEVICE_MAPPING])
with instance.mutated_migration_context():
self.driver.spawn(context, instance, image_meta, injected_files,
admin_password, network_info=network_info,
block_device_info=new_block_device_info)
@messaging.expected_exceptions(exception.PreserveEphemeralNotSupported)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def rebuild_instance(self, context, instance, orig_image_ref, image_ref,
injected_files, new_pass, orig_sys_metadata,
bdms, recreate, on_shared_storage=None,
preserve_ephemeral=False, migration=None,
scheduled_node=None, limits=None):
"""Destroy and re-make this instance.
A 'rebuild' effectively purges all existing data from the system and
remakes the VM with given 'metadata' and 'personalities'.
:param context: `nova.RequestContext` object
:param instance: Instance object
:param orig_image_ref: Original image_ref before rebuild
:param image_ref: New image_ref for rebuild
:param injected_files: Files to inject
:param new_pass: password to set on rebuilt instance
:param orig_sys_metadata: instance system metadata from pre-rebuild
:param bdms: block-device-mappings to use for rebuild
:param recreate: True if the instance is being recreated (e.g. the
hypervisor it was on failed) - cleanup of old state will be
skipped.
:param on_shared_storage: True if instance files on shared storage.
If not provided then information from the
driver will be used to decide if the instance
files are available or not on the target host
:param preserve_ephemeral: True if the default ephemeral storage
partition must be preserved on rebuild
:param migration: a Migration object if one was created for this
rebuild operation (if it's a part of evacaute)
:param scheduled_node: A node of the host chosen by the scheduler. If a
host was specified by the user, this will be
None
:param limits: Overcommit limits set by the scheduler. If a host was
specified by the user, this will be None
"""
context = context.elevated()
LOG.info(_LI("Rebuilding instance"), context=context,
instance=instance)
if scheduled_node is not None:
rt = self._get_resource_tracker(scheduled_node)
rebuild_claim = rt.rebuild_claim
else:
rebuild_claim = claims.NopClaim
image_meta = {}
if image_ref:
image_meta = self.image_api.get(context, image_ref)
# NOTE(mriedem): On a recreate (evacuate), we need to update
# the instance's host and node properties to reflect it's
# destination node for the recreate.
if not scheduled_node:
try:
compute_node = self._get_compute_info(context, self.host)
scheduled_node = compute_node.hypervisor_hostname
except exception.ComputeHostNotFound:
LOG.exception(_LE('Failed to get compute_info for %s'),
self.host)
with self._error_out_instance_on_exception(context, instance):
try:
claim_ctxt = rebuild_claim(
context, instance, limits=limits, image_meta=image_meta,
migration=migration)
self._do_rebuild_instance_with_claim(
claim_ctxt, context, instance, orig_image_ref,
image_ref, injected_files, new_pass, orig_sys_metadata,
bdms, recreate, on_shared_storage, preserve_ephemeral)
except exception.ComputeResourcesUnavailable as e:
LOG.debug("Could not rebuild instance on this host, not "
"enough resources available.", instance=instance)
# NOTE(ndipanov): We just abort the build for now and leave a
# migration record for potential cleanup later
self._set_migration_status(migration, 'failed')
self._notify_about_instance_usage(context, instance,
'rebuild.error', fault=e)
raise exception.BuildAbortException(
instance_uuid=instance.uuid, reason=e.format_message())
except (exception.InstanceNotFound,
exception.UnexpectedDeletingTaskStateError) as e:
LOG.debug('Instance was deleted while rebuilding',
instance=instance)
self._set_migration_status(migration, 'failed')
self._notify_about_instance_usage(context, instance,
'rebuild.error', fault=e)
except Exception as e:
self._set_migration_status(migration, 'failed')
self._notify_about_instance_usage(context, instance,
'rebuild.error', fault=e)
raise
else:
instance.apply_migration_context()
# NOTE (ndipanov): This save will now update the host and node
# attributes making sure that next RT pass is consistent since
# it will be based on the instance and not the migration DB
# entry.
instance.host = self.host
instance.node = scheduled_node
instance.save()
instance.drop_migration_context()
# NOTE (ndipanov): Mark the migration as done only after we
# mark the instance as belonging to this host.
self._set_migration_status(migration, 'done')
def _do_rebuild_instance_with_claim(self, claim_context, *args, **kwargs):
"""Helper to avoid deep nesting in the top-level method."""
with claim_context:
self._do_rebuild_instance(*args, **kwargs)
@staticmethod
def _get_image_name(image_meta):
if image_meta.obj_attr_is_set("name"):
return image_meta.name
else:
return ''
def _do_rebuild_instance(self, context, instance, orig_image_ref,
image_ref, injected_files, new_pass,
orig_sys_metadata, bdms, recreate,
on_shared_storage, preserve_ephemeral):
orig_vm_state = instance.vm_state
if recreate:
if not self.driver.capabilities["supports_recreate"]:
raise exception.InstanceRecreateNotSupported
self._check_instance_exists(context, instance)
if on_shared_storage is None:
LOG.debug('on_shared_storage is not provided, using driver'
'information to decide if the instance needs to'
'be recreated')
on_shared_storage = self.driver.instance_on_disk(instance)
elif (on_shared_storage !=
self.driver.instance_on_disk(instance)):
# To cover case when admin expects that instance files are
# on shared storage, but not accessible and vice versa
raise exception.InvalidSharedStorage(
_("Invalid state of instance files on shared"
" storage"))
if on_shared_storage:
LOG.info(_LI('disk on shared storage, recreating using'
' existing disk'))
else:
image_ref = orig_image_ref = instance.image_ref
LOG.info(_LI("disk not on shared storage, rebuilding from:"
" '%s'"), str(image_ref))
if image_ref:
image_meta = objects.ImageMeta.from_image_ref(
context, self.image_api, image_ref)
else:
image_meta = objects.ImageMeta.from_dict({})
# This instance.exists message should contain the original
# image_ref, not the new one. Since the DB has been updated
# to point to the new one... we have to override it.
# TODO(jaypipes): Move generate_image_url() into the nova.image.api
orig_image_ref_url = glance.generate_image_url(orig_image_ref)
extra_usage_info = {'image_ref_url': orig_image_ref_url}
compute_utils.notify_usage_exists(
self.notifier, context, instance,
current_period=True, system_metadata=orig_sys_metadata,
extra_usage_info=extra_usage_info)
# This message should contain the new image_ref
extra_usage_info = {'image_name': self._get_image_name(image_meta)}
self._notify_about_instance_usage(context, instance,
"rebuild.start", extra_usage_info=extra_usage_info)
instance.power_state = self._get_power_state(context, instance)
instance.task_state = task_states.REBUILDING
instance.save(expected_task_state=[task_states.REBUILDING])
if recreate:
# Needed for nova-network, does nothing for neutron
self.network_api.setup_networks_on_host(
context, instance, self.host)
# For nova-network this is needed to move floating IPs
# For neutron this updates the host in the port binding
# TODO(cfriesen): this network_api call and the one above
# are so similar, we should really try to unify them.
self.network_api.setup_instance_network_on_host(
context, instance, self.host)
network_info = compute_utils.get_nw_info_for_instance(instance)
if bdms is None:
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
block_device_info = \
self._get_instance_block_device_info(
context, instance, bdms=bdms)
def detach_block_devices(context, bdms):
for bdm in bdms:
if bdm.is_volume:
self._detach_volume(context, bdm.volume_id, instance,
destroy_bdm=False)
files = self._decode_files(injected_files)
kwargs = dict(
context=context,
instance=instance,
image_meta=image_meta,
injected_files=files,
admin_password=new_pass,
bdms=bdms,
detach_block_devices=detach_block_devices,
attach_block_devices=self._prep_block_device,
block_device_info=block_device_info,
network_info=network_info,
preserve_ephemeral=preserve_ephemeral,
recreate=recreate)
try:
with instance.mutated_migration_context():
self.driver.rebuild(**kwargs)
except NotImplementedError:
# NOTE(rpodolyaka): driver doesn't provide specialized version
# of rebuild, fall back to the default implementation
self._rebuild_default_impl(**kwargs)
self._update_instance_after_spawn(context, instance)
instance.save(expected_task_state=[task_states.REBUILD_SPAWNING])
if orig_vm_state == vm_states.STOPPED:
LOG.info(_LI("bringing vm to original state: '%s'"),
orig_vm_state, instance=instance)
instance.vm_state = vm_states.ACTIVE
instance.task_state = task_states.POWERING_OFF
instance.progress = 0
instance.save()
self.stop_instance(context, instance, False)
self._update_scheduler_instance_info(context, instance)
self._notify_about_instance_usage(
context, instance, "rebuild.end",
network_info=network_info,
extra_usage_info=extra_usage_info)
def _handle_bad_volumes_detached(self, context, instance, bad_devices,
block_device_info):
"""Handle cases where the virt-layer had to detach non-working volumes
in order to complete an operation.
"""
for bdm in block_device_info['block_device_mapping']:
if bdm.get('mount_device') in bad_devices:
try:
volume_id = bdm['connection_info']['data']['volume_id']
except KeyError:
continue
# NOTE(sirp): ideally we'd just call
# `compute_api.detach_volume` here but since that hits the
# DB directly, that's off limits from within the
# compute-manager.
#
# API-detach
LOG.info(_LI("Detaching from volume api: %s"), volume_id)
volume = self.volume_api.get(context, volume_id)
self.volume_api.check_detach(context, volume)
self.volume_api.begin_detaching(context, volume_id)
# Manager-detach
self.detach_volume(context, volume_id, instance)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def reboot_instance(self, context, instance, block_device_info,
reboot_type):
"""Reboot an instance on this host."""
# acknowledge the request made it to the manager
if reboot_type == "SOFT":
instance.task_state = task_states.REBOOT_PENDING
expected_states = (task_states.REBOOTING,
task_states.REBOOT_PENDING,
task_states.REBOOT_STARTED)
else:
instance.task_state = task_states.REBOOT_PENDING_HARD
expected_states = (task_states.REBOOTING_HARD,
task_states.REBOOT_PENDING_HARD,
task_states.REBOOT_STARTED_HARD)
context = context.elevated()
LOG.info(_LI("Rebooting instance"), context=context, instance=instance)
block_device_info = self._get_instance_block_device_info(context,
instance)
network_info = self.network_api.get_instance_nw_info(context, instance)
self._notify_about_instance_usage(context, instance, "reboot.start")
instance.power_state = self._get_power_state(context, instance)
instance.save(expected_task_state=expected_states)
if instance.power_state != power_state.RUNNING:
state = instance.power_state
running = power_state.RUNNING
LOG.warning(_LW('trying to reboot a non-running instance:'
' (state: %(state)s expected: %(running)s)'),
{'state': state, 'running': running},
context=context, instance=instance)
def bad_volumes_callback(bad_devices):
self._handle_bad_volumes_detached(
context, instance, bad_devices, block_device_info)
try:
# Don't change it out of rescue mode
if instance.vm_state == vm_states.RESCUED:
new_vm_state = vm_states.RESCUED
else:
new_vm_state = vm_states.ACTIVE
new_power_state = None
if reboot_type == "SOFT":
instance.task_state = task_states.REBOOT_STARTED
expected_state = task_states.REBOOT_PENDING
else:
instance.task_state = task_states.REBOOT_STARTED_HARD
expected_state = task_states.REBOOT_PENDING_HARD
instance.save(expected_task_state=expected_state)
self.driver.reboot(context, instance,
network_info,
reboot_type,
block_device_info=block_device_info,
bad_volumes_callback=bad_volumes_callback)
except Exception as error:
with excutils.save_and_reraise_exception() as ctxt:
exc_info = sys.exc_info()
# if the reboot failed but the VM is running don't
# put it into an error state
new_power_state = self._get_power_state(context, instance)
if new_power_state == power_state.RUNNING:
LOG.warning(_LW('Reboot failed but instance is running'),
context=context, instance=instance)
compute_utils.add_instance_fault_from_exc(context,
instance, error, exc_info)
self._notify_about_instance_usage(context, instance,
'reboot.error', fault=error)
ctxt.reraise = False
else:
LOG.error(_LE('Cannot reboot instance: %s'), error,
context=context, instance=instance)
self._set_instance_obj_error_state(context, instance)
if not new_power_state:
new_power_state = self._get_power_state(context, instance)
try:
instance.power_state = new_power_state
instance.vm_state = new_vm_state
instance.task_state = None
instance.save()
except exception.InstanceNotFound:
LOG.warning(_LW("Instance disappeared during reboot"),
context=context, instance=instance)
self._notify_about_instance_usage(context, instance, "reboot.end")
@delete_image_on_error
def _do_snapshot_instance(self, context, image_id, instance, rotation):
self._snapshot_instance(context, image_id, instance,
task_states.IMAGE_BACKUP)
@wrap_exception()
@reverts_task_state
@wrap_instance_fault
def backup_instance(self, context, image_id, instance, backup_type,
rotation):
"""Backup an instance on this host.
:param backup_type: daily | weekly
:param rotation: int representing how many backups to keep around
"""
self._do_snapshot_instance(context, image_id, instance, rotation)
self._rotate_backups(context, instance, backup_type, rotation)
@wrap_exception()
@reverts_task_state
@wrap_instance_fault
@delete_image_on_error
def snapshot_instance(self, context, image_id, instance):
"""Snapshot an instance on this host.
:param context: security context
:param instance: a nova.objects.instance.Instance object
:param image_id: glance.db.sqlalchemy.models.Image.Id
"""
# NOTE(dave-mcnally) the task state will already be set by the api
# but if the compute manager has crashed/been restarted prior to the
# request getting here the task state may have been cleared so we set
# it again and things continue normally
try:
instance.task_state = task_states.IMAGE_SNAPSHOT
instance.save(
expected_task_state=task_states.IMAGE_SNAPSHOT_PENDING)
except exception.InstanceNotFound:
# possibility instance no longer exists, no point in continuing
LOG.debug("Instance not found, could not set state %s "
"for instance.",
task_states.IMAGE_SNAPSHOT, instance=instance)
return
except exception.UnexpectedDeletingTaskStateError:
LOG.debug("Instance being deleted, snapshot cannot continue",
instance=instance)
return
self._snapshot_instance(context, image_id, instance,
task_states.IMAGE_SNAPSHOT)
def _snapshot_instance(self, context, image_id, instance,
expected_task_state):
context = context.elevated()
instance.power_state = self._get_power_state(context, instance)
try:
instance.save()
LOG.info(_LI('instance snapshotting'), context=context,
instance=instance)
if instance.power_state != power_state.RUNNING:
state = instance.power_state
running = power_state.RUNNING
LOG.warning(_LW('trying to snapshot a non-running instance: '
'(state: %(state)s expected: %(running)s)'),
{'state': state, 'running': running},
instance=instance)
self._notify_about_instance_usage(
context, instance, "snapshot.start")
def update_task_state(task_state,
expected_state=expected_task_state):
instance.task_state = task_state
instance.save(expected_task_state=expected_state)
self.driver.snapshot(context, instance, image_id,
update_task_state)
instance.task_state = None
instance.save(expected_task_state=task_states.IMAGE_UPLOADING)
self._notify_about_instance_usage(context, instance,
"snapshot.end")
except (exception.InstanceNotFound,
exception.UnexpectedDeletingTaskStateError):
# the instance got deleted during the snapshot
# Quickly bail out of here
msg = 'Instance disappeared during snapshot'
LOG.debug(msg, instance=instance)
try:
image_service = glance.get_default_image_service()
image = image_service.show(context, image_id)
if image['status'] != 'active':
image_service.delete(context, image_id)
except Exception:
LOG.warning(_LW("Error while trying to clean up image %s"),
image_id, instance=instance)
except exception.ImageNotFound:
instance.task_state = None
instance.save()
msg = _LW("Image not found during snapshot")
LOG.warn(msg, instance=instance)
def _post_interrupted_snapshot_cleanup(self, context, instance):
self.driver.post_interrupted_snapshot_cleanup(context, instance)
@messaging.expected_exceptions(NotImplementedError)
@wrap_exception()
def volume_snapshot_create(self, context, instance, volume_id,
create_info):
self.driver.volume_snapshot_create(context, instance, volume_id,
create_info)
@messaging.expected_exceptions(NotImplementedError)
@wrap_exception()
def volume_snapshot_delete(self, context, instance, volume_id,
snapshot_id, delete_info):
self.driver.volume_snapshot_delete(context, instance, volume_id,
snapshot_id, delete_info)
@wrap_instance_fault
def _rotate_backups(self, context, instance, backup_type, rotation):
"""Delete excess backups associated to an instance.
Instances are allowed a fixed number of backups (the rotation number);
this method deletes the oldest backups that exceed the rotation
threshold.
:param context: security context
:param instance: Instance dict
:param backup_type: a user-defined type, like "daily" or "weekly" etc.
:param rotation: int representing how many backups to keep around;
None if rotation shouldn't be used (as in the case of snapshots)
"""
filters = {'property-image_type': 'backup',
'property-backup_type': backup_type,
'property-instance_uuid': instance.uuid}
images = self.image_api.get_all(context, filters=filters,
sort_key='created_at', sort_dir='desc')
num_images = len(images)
LOG.debug("Found %(num_images)d images (rotation: %(rotation)d)",
{'num_images': num_images, 'rotation': rotation},
instance=instance)
if num_images > rotation:
# NOTE(sirp): this deletes all backups that exceed the rotation
# limit
excess = len(images) - rotation
LOG.debug("Rotating out %d backups", excess,
instance=instance)
for i in range(excess):
image = images.pop()
image_id = image['id']
LOG.debug("Deleting image %s", image_id,
instance=instance)
self.image_api.delete(context, image_id)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def set_admin_password(self, context, instance, new_pass):
"""Set the root/admin password for an instance on this host.
This is generally only called by API password resets after an
image has been built.
@param context: Nova auth context.
@param instance: Nova instance object.
@param new_pass: The admin password for the instance.
"""
context = context.elevated()
if new_pass is None:
# Generate a random password
new_pass = utils.generate_password()
current_power_state = self._get_power_state(context, instance)
expected_state = power_state.RUNNING
if current_power_state != expected_state:
instance.task_state = None
instance.save(expected_task_state=task_states.UPDATING_PASSWORD)
_msg = _('instance %s is not running') % instance.uuid
raise exception.InstancePasswordSetFailed(
instance=instance.uuid, reason=_msg)
try:
self.driver.set_admin_password(instance, new_pass)
LOG.info(_LI("Root password set"), instance=instance)
instance.task_state = None
instance.save(
expected_task_state=task_states.UPDATING_PASSWORD)
except NotImplementedError:
LOG.warning(_LW('set_admin_password is not implemented '
'by this driver or guest instance.'),
instance=instance)
instance.task_state = None
instance.save(
expected_task_state=task_states.UPDATING_PASSWORD)
raise NotImplementedError(_('set_admin_password is not '
'implemented by this driver or guest '
'instance.'))
except exception.UnexpectedTaskStateError:
# interrupted by another (most likely delete) task
# do not retry
raise
except Exception:
# Catch all here because this could be anything.
LOG.exception(_LE('set_admin_password failed'),
instance=instance)
self._set_instance_obj_error_state(context, instance)
# We create a new exception here so that we won't
# potentially reveal password information to the
# API caller. The real exception is logged above
_msg = _('error setting admin password')
raise exception.InstancePasswordSetFailed(
instance=instance.uuid, reason=_msg)
@wrap_exception()
@reverts_task_state
@wrap_instance_fault
def inject_file(self, context, path, file_contents, instance):
"""Write a file to the specified path in an instance on this host."""
# NOTE(russellb) Remove this method, as well as the underlying virt
# driver methods, when the compute rpc interface is bumped to 4.x
# as it is no longer used.
context = context.elevated()
current_power_state = self._get_power_state(context, instance)
expected_state = power_state.RUNNING
if current_power_state != expected_state:
LOG.warning(_LW('trying to inject a file into a non-running '
'(state: %(current_state)s expected: '
'%(expected_state)s)'),
{'current_state': current_power_state,
'expected_state': expected_state},
instance=instance)
LOG.info(_LI('injecting file to %s'), path,
instance=instance)
self.driver.inject_file(instance, path, file_contents)
def _get_rescue_image(self, context, instance, rescue_image_ref=None):
"""Determine what image should be used to boot the rescue VM."""
# 1. If rescue_image_ref is passed in, use that for rescue.
# 2. Else, use the base image associated with instance's current image.
# The idea here is to provide the customer with a rescue
# environment which they are familiar with.
# So, if they built their instance off of a Debian image,
# their rescue VM will also be Debian.
# 3. As a last resort, use instance's current image.
if not rescue_image_ref:
system_meta = utils.instance_sys_meta(instance)
rescue_image_ref = system_meta.get('image_base_image_ref')
if not rescue_image_ref:
LOG.warning(_LW('Unable to find a different image to use for '
'rescue VM, using instance\'s current image'),
instance=instance)
rescue_image_ref = instance.image_ref
return objects.ImageMeta.from_image_ref(
context, self.image_api, rescue_image_ref)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def rescue_instance(self, context, instance, rescue_password,
rescue_image_ref, clean_shutdown):
context = context.elevated()
LOG.info(_LI('Rescuing'), context=context, instance=instance)
admin_password = (rescue_password if rescue_password else
utils.generate_password())
network_info = self.network_api.get_instance_nw_info(context, instance)
rescue_image_meta = self._get_rescue_image(context, instance,
rescue_image_ref)
extra_usage_info = {'rescue_image_name':
self._get_image_name(rescue_image_meta)}
self._notify_about_instance_usage(context, instance,
"rescue.start", extra_usage_info=extra_usage_info,
network_info=network_info)
try:
self._power_off_instance(context, instance, clean_shutdown)
self.driver.rescue(context, instance,
network_info,
rescue_image_meta, admin_password)
except Exception as e:
LOG.exception(_LE("Error trying to Rescue Instance"),
instance=instance)
self._set_instance_obj_error_state(context, instance)
raise exception.InstanceNotRescuable(
instance_id=instance.uuid,
reason=_("Driver Error: %s") % e)
compute_utils.notify_usage_exists(self.notifier, context, instance,
current_period=True)
instance.vm_state = vm_states.RESCUED
instance.task_state = None
instance.power_state = self._get_power_state(context, instance)
instance.launched_at = timeutils.utcnow()
instance.save(expected_task_state=task_states.RESCUING)
self._notify_about_instance_usage(context, instance,
"rescue.end", extra_usage_info=extra_usage_info,
network_info=network_info)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def unrescue_instance(self, context, instance):
context = context.elevated()
LOG.info(_LI('Unrescuing'), context=context, instance=instance)
network_info = self.network_api.get_instance_nw_info(context, instance)
self._notify_about_instance_usage(context, instance,
"unrescue.start", network_info=network_info)
with self._error_out_instance_on_exception(context, instance):
self.driver.unrescue(instance,
network_info)
instance.vm_state = vm_states.ACTIVE
instance.task_state = None
instance.power_state = self._get_power_state(context, instance)
instance.save(expected_task_state=task_states.UNRESCUING)
self._notify_about_instance_usage(context,
instance,
"unrescue.end",
network_info=network_info)
@wrap_exception()
@wrap_instance_fault
def change_instance_metadata(self, context, diff, instance):
"""Update the metadata published to the instance."""
LOG.debug("Changing instance metadata according to %r",
diff, instance=instance)
self.driver.change_instance_metadata(context, instance, diff)
@wrap_exception()
@wrap_instance_event
@wrap_instance_fault
def confirm_resize(self, context, instance, reservations, migration):
quotas = objects.Quotas.from_reservations(context,
reservations,
instance=instance)
@utils.synchronized(instance.uuid)
def do_confirm_resize(context, instance, migration_id):
# NOTE(wangpan): Get the migration status from db, if it has been
# confirmed, we do nothing and return here
LOG.debug("Going to confirm migration %s", migration_id,
context=context, instance=instance)
try:
# TODO(russellb) Why are we sending the migration object just
# to turn around and look it up from the db again?
migration = objects.Migration.get_by_id(
context.elevated(), migration_id)
except exception.MigrationNotFound:
LOG.error(_LE("Migration %s is not found during confirmation"),
migration_id, context=context, instance=instance)
quotas.rollback()
return
if migration.status == 'confirmed':
LOG.info(_LI("Migration %s is already confirmed"),
migration_id, context=context, instance=instance)
quotas.rollback()
return
elif migration.status not in ('finished', 'confirming'):
LOG.warning(_LW("Unexpected confirmation status '%(status)s' "
"of migration %(id)s, exit confirmation "
"process"),
{"status": migration.status, "id": migration_id},
context=context, instance=instance)
quotas.rollback()
return
# NOTE(wangpan): Get the instance from db, if it has been
# deleted, we do nothing and return here
expected_attrs = ['metadata', 'system_metadata', 'flavor']
try:
instance = objects.Instance.get_by_uuid(
context, instance.uuid,
expected_attrs=expected_attrs)
except exception.InstanceNotFound:
LOG.info(_LI("Instance is not found during confirmation"),
context=context, instance=instance)
quotas.rollback()
return
self._confirm_resize(context, instance, quotas,
migration=migration)
do_confirm_resize(context, instance, migration.id)
def _confirm_resize(self, context, instance, quotas,
migration=None):
"""Destroys the source instance."""
self._notify_about_instance_usage(context, instance,
"resize.confirm.start")
with self._error_out_instance_on_exception(context, instance,
quotas=quotas):
# NOTE(danms): delete stashed migration information
old_instance_type = instance.old_flavor
instance.old_flavor = None
instance.new_flavor = None
instance.system_metadata.pop('old_vm_state', None)
instance.save()
# NOTE(tr3buchet): tear down networks on source host
self.network_api.setup_networks_on_host(context, instance,
migration.source_compute, teardown=True)
network_info = self.network_api.get_instance_nw_info(context,
instance)
self.driver.confirm_migration(migration, instance,
network_info)
migration.status = 'confirmed'
with migration.obj_as_admin():
migration.save()
rt = self._get_resource_tracker(migration.source_node)
rt.drop_move_claim(context, instance, old_instance_type)
# NOTE(mriedem): The old_vm_state could be STOPPED but the user
# might have manually powered up the instance to confirm the
# resize/migrate, so we need to check the current power state
# on the instance and set the vm_state appropriately. We default
# to ACTIVE because if the power state is not SHUTDOWN, we
# assume _sync_instance_power_state will clean it up.
p_state = instance.power_state
vm_state = None
if p_state == power_state.SHUTDOWN:
vm_state = vm_states.STOPPED
LOG.debug("Resized/migrated instance is powered off. "
"Setting vm_state to '%s'.", vm_state,
instance=instance)
else:
vm_state = vm_states.ACTIVE
instance.vm_state = vm_state
instance.task_state = None
instance.save(expected_task_state=[None, task_states.DELETING])
self._notify_about_instance_usage(
context, instance, "resize.confirm.end",
network_info=network_info)
quotas.commit()
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@errors_out_migration
@wrap_instance_fault
def revert_resize(self, context, instance, migration, reservations):
"""Destroys the new instance on the destination machine.
Reverts the model changes, and powers on the old instance on the
source machine.
"""
quotas = objects.Quotas.from_reservations(context,
reservations,
instance=instance)
# NOTE(comstud): A revert_resize is essentially a resize back to
# the old size, so we need to send a usage event here.
compute_utils.notify_usage_exists(self.notifier, context, instance,
current_period=True)
with self._error_out_instance_on_exception(context, instance,
quotas=quotas):
# NOTE(tr3buchet): tear down networks on destination host
self.network_api.setup_networks_on_host(context, instance,
teardown=True)
migration_p = obj_base.obj_to_primitive(migration)
self.network_api.migrate_instance_start(context,
instance,
migration_p)
network_info = self.network_api.get_instance_nw_info(context,
instance)
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
block_device_info = self._get_instance_block_device_info(
context, instance, bdms=bdms)
destroy_disks = not self._is_instance_storage_shared(
context, instance, host=migration.source_compute)
self.driver.destroy(context, instance, network_info,
block_device_info, destroy_disks)
self._terminate_volume_connections(context, instance, bdms)
migration.status = 'reverted'
with migration.obj_as_admin():
migration.save()
# NOTE(ndipanov): We need to do this here because dropping the
# claim means we lose the migration_context data. We really should
# fix this by moving the drop_move_claim call to the
# finish_revert_resize method as this is racy (revert is dropped,
# but instance resources will be tracked with the new flavor until
# it gets rolled back in finish_revert_resize, which is
# potentially wrong for a period of time).
instance.revert_migration_context()
instance.save()
rt = self._get_resource_tracker(instance.node)
rt.drop_move_claim(context, instance)
self.compute_rpcapi.finish_revert_resize(context, instance,
migration, migration.source_compute,
quotas.reservations)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@errors_out_migration
@wrap_instance_fault
def finish_revert_resize(self, context, instance, reservations, migration):
"""Finishes the second half of reverting a resize.
Bring the original source instance state back (active/shutoff) and
revert the resized attributes in the database.
"""
quotas = objects.Quotas.from_reservations(context,
reservations,
instance=instance)
with self._error_out_instance_on_exception(context, instance,
quotas=quotas):
network_info = self.network_api.get_instance_nw_info(context,
instance)
self._notify_about_instance_usage(
context, instance, "resize.revert.start")
# NOTE(mriedem): delete stashed old_vm_state information; we
# default to ACTIVE for backwards compatibility if old_vm_state
# is not set
old_vm_state = instance.system_metadata.pop('old_vm_state',
vm_states.ACTIVE)
self._set_instance_info(instance, instance.old_flavor)
instance.old_flavor = None
instance.new_flavor = None
instance.host = migration.source_compute
instance.node = migration.source_node
instance.save()
migration.dest_compute = migration.source_compute
with migration.obj_as_admin():
migration.save()
self.network_api.setup_networks_on_host(context, instance,
migration.source_compute)
block_device_info = self._get_instance_block_device_info(
context, instance, refresh_conn_info=True)
power_on = old_vm_state != vm_states.STOPPED
self.driver.finish_revert_migration(context, instance,
network_info,
block_device_info, power_on)
instance.launched_at = timeutils.utcnow()
instance.save(expected_task_state=task_states.RESIZE_REVERTING)
migration_p = obj_base.obj_to_primitive(migration)
self.network_api.migrate_instance_finish(context,
instance,
migration_p)
# if the original vm state was STOPPED, set it back to STOPPED
LOG.info(_LI("Updating instance to original state: '%s'"),
old_vm_state, instance=instance)
if power_on:
instance.vm_state = vm_states.ACTIVE
instance.task_state = None
instance.save()
else:
instance.task_state = task_states.POWERING_OFF
instance.save()
self.stop_instance(context, instance=instance,
clean_shutdown=True)
self._notify_about_instance_usage(
context, instance, "resize.revert.end")
quotas.commit()
def _prep_resize(self, context, image, instance, instance_type,
quotas, request_spec, filter_properties, node,
clean_shutdown=True):
if not filter_properties:
filter_properties = {}
if not instance.host:
self._set_instance_obj_error_state(context, instance)
msg = _('Instance has no source host')
raise exception.MigrationError(reason=msg)
same_host = instance.host == self.host
# if the flavor IDs match, it's migrate; otherwise resize
if same_host and instance_type.id == instance['instance_type_id']:
# check driver whether support migrate to same host
if not self.driver.capabilities['supports_migrate_to_same_host']:
raise exception.UnableToMigrateToSelf(
instance_id=instance.uuid, host=self.host)
# NOTE(danms): Stash the new instance_type to avoid having to
# look it up in the database later
instance.new_flavor = instance_type
# NOTE(mriedem): Stash the old vm_state so we can set the
# resized/reverted instance back to the same state later.
vm_state = instance.vm_state
LOG.debug('Stashing vm_state: %s', vm_state, instance=instance)
instance.system_metadata['old_vm_state'] = vm_state
instance.save()
limits = filter_properties.get('limits', {})
rt = self._get_resource_tracker(node)
with rt.resize_claim(context, instance, instance_type,
image_meta=image, limits=limits) as claim:
LOG.info(_LI('Migrating'), context=context, instance=instance)
self.compute_rpcapi.resize_instance(
context, instance, claim.migration, image,
instance_type, quotas.reservations,
clean_shutdown)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def prep_resize(self, context, image, instance, instance_type,
reservations, request_spec, filter_properties, node,
clean_shutdown):
"""Initiates the process of moving a running instance to another host.
Possibly changes the RAM and disk size in the process.
"""
if node is None:
node = self.driver.get_available_nodes(refresh=True)[0]
LOG.debug("No node specified, defaulting to %s", node,
instance=instance)
# NOTE(melwitt): Remove this in version 5.0 of the RPC API
# Code downstream may expect extra_specs to be populated since it
# is receiving an object, so lookup the flavor to ensure this.
if not isinstance(instance_type, objects.Flavor):
instance_type = objects.Flavor.get_by_id(context,
instance_type['id'])
quotas = objects.Quotas.from_reservations(context,
reservations,
instance=instance)
with self._error_out_instance_on_exception(context, instance,
quotas=quotas):
compute_utils.notify_usage_exists(self.notifier, context, instance,
current_period=True)
self._notify_about_instance_usage(
context, instance, "resize.prep.start")
try:
self._prep_resize(context, image, instance,
instance_type, quotas,
request_spec, filter_properties,
node, clean_shutdown)
# NOTE(dgenin): This is thrown in LibvirtDriver when the
# instance to be migrated is backed by LVM.
# Remove when LVM migration is implemented.
except exception.MigrationPreCheckError:
raise
except Exception:
# try to re-schedule the resize elsewhere:
exc_info = sys.exc_info()
self._reschedule_resize_or_reraise(context, image, instance,
exc_info, instance_type, quotas, request_spec,
filter_properties)
finally:
extra_usage_info = dict(
new_instance_type=instance_type.name,
new_instance_type_id=instance_type.id)
self._notify_about_instance_usage(
context, instance, "resize.prep.end",
extra_usage_info=extra_usage_info)
def _reschedule_resize_or_reraise(self, context, image, instance, exc_info,
instance_type, quotas, request_spec, filter_properties):
"""Try to re-schedule the resize or re-raise the original error to
error out the instance.
"""
if not request_spec:
request_spec = {}
if not filter_properties:
filter_properties = {}
rescheduled = False
instance_uuid = instance.uuid
try:
reschedule_method = self.compute_task_api.resize_instance
scheduler_hint = dict(filter_properties=filter_properties)
method_args = (instance, None, scheduler_hint, instance_type,
quotas.reservations)
task_state = task_states.RESIZE_PREP
rescheduled = self._reschedule(context, request_spec,
filter_properties, instance, reschedule_method,
method_args, task_state, exc_info)
except Exception as error:
rescheduled = False
LOG.exception(_LE("Error trying to reschedule"),
instance_uuid=instance_uuid)
compute_utils.add_instance_fault_from_exc(context,
instance, error,
exc_info=sys.exc_info())
self._notify_about_instance_usage(context, instance,
'resize.error', fault=error)
if rescheduled:
self._log_original_error(exc_info, instance_uuid)
compute_utils.add_instance_fault_from_exc(context,
instance, exc_info[1], exc_info=exc_info)
self._notify_about_instance_usage(context, instance,
'resize.error', fault=exc_info[1])
else:
# not re-scheduling
six.reraise(*exc_info)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@errors_out_migration
@wrap_instance_fault
def resize_instance(self, context, instance, image,
reservations, migration, instance_type,
clean_shutdown):
"""Starts the migration of a running instance to another host."""
quotas = objects.Quotas.from_reservations(context,
reservations,
instance=instance)
with self._error_out_instance_on_exception(context, instance,
quotas=quotas):
# TODO(chaochin) Remove this until v5 RPC API
# Code downstream may expect extra_specs to be populated since it
# is receiving an object, so lookup the flavor to ensure this.
if (not instance_type or
not isinstance(instance_type, objects.Flavor)):
instance_type = objects.Flavor.get_by_id(
context, migration['new_instance_type_id'])
network_info = self.network_api.get_instance_nw_info(context,
instance)
migration.status = 'migrating'
with migration.obj_as_admin():
migration.save()
instance.task_state = task_states.RESIZE_MIGRATING
instance.save(expected_task_state=task_states.RESIZE_PREP)
self._notify_about_instance_usage(
context, instance, "resize.start", network_info=network_info)
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
block_device_info = self._get_instance_block_device_info(
context, instance, bdms=bdms)
timeout, retry_interval = self._get_power_off_values(context,
instance, clean_shutdown)
disk_info = self.driver.migrate_disk_and_power_off(
context, instance, migration.dest_host,
instance_type, network_info,
block_device_info,
timeout, retry_interval)
self._terminate_volume_connections(context, instance, bdms)
migration_p = obj_base.obj_to_primitive(migration)
self.network_api.migrate_instance_start(context,
instance,
migration_p)
migration.status = 'post-migrating'
with migration.obj_as_admin():
migration.save()
instance.host = migration.dest_compute
instance.node = migration.dest_node
instance.task_state = task_states.RESIZE_MIGRATED
instance.save(expected_task_state=task_states.RESIZE_MIGRATING)
self.compute_rpcapi.finish_resize(context, instance,
migration, image, disk_info,
migration.dest_compute, reservations=quotas.reservations)
self._notify_about_instance_usage(context, instance, "resize.end",
network_info=network_info)
self.instance_events.clear_events_for_instance(instance)
def _terminate_volume_connections(self, context, instance, bdms):
connector = self.driver.get_volume_connector(instance)
for bdm in bdms:
if bdm.is_volume:
self.volume_api.terminate_connection(context, bdm.volume_id,
connector)
@staticmethod
def _set_instance_info(instance, instance_type):
instance.instance_type_id = instance_type.id
instance.memory_mb = instance_type.memory_mb
instance.vcpus = instance_type.vcpus
instance.root_gb = instance_type.root_gb
instance.ephemeral_gb = instance_type.ephemeral_gb
instance.flavor = instance_type
def _finish_resize(self, context, instance, migration, disk_info,
image_meta):
resize_instance = False
old_instance_type_id = migration['old_instance_type_id']
new_instance_type_id = migration['new_instance_type_id']
old_instance_type = instance.get_flavor()
# NOTE(mriedem): Get the old_vm_state so we know if we should
# power on the instance. If old_vm_state is not set we need to default
# to ACTIVE for backwards compatibility
old_vm_state = instance.system_metadata.get('old_vm_state',
vm_states.ACTIVE)
instance.old_flavor = old_instance_type
if old_instance_type_id != new_instance_type_id:
instance_type = instance.get_flavor('new')
self._set_instance_info(instance, instance_type)
for key in ('root_gb', 'swap', 'ephemeral_gb'):
if old_instance_type[key] != instance_type[key]:
resize_instance = True
break
instance.apply_migration_context()
# NOTE(tr3buchet): setup networks on destination host
self.network_api.setup_networks_on_host(context, instance,
migration['dest_compute'])
migration_p = obj_base.obj_to_primitive(migration)
self.network_api.migrate_instance_finish(context,
instance,
migration_p)
network_info = self.network_api.get_instance_nw_info(context, instance)
instance.task_state = task_states.RESIZE_FINISH
instance.save(expected_task_state=task_states.RESIZE_MIGRATED)
self._notify_about_instance_usage(
context, instance, "finish_resize.start",
network_info=network_info)
block_device_info = self._get_instance_block_device_info(
context, instance, refresh_conn_info=True)
# NOTE(mriedem): If the original vm_state was STOPPED, we don't
# automatically power on the instance after it's migrated
power_on = old_vm_state != vm_states.STOPPED
try:
self.driver.finish_migration(context, migration, instance,
disk_info,
network_info,
image_meta, resize_instance,
block_device_info, power_on)
except Exception:
with excutils.save_and_reraise_exception():
if old_instance_type_id != new_instance_type_id:
self._set_instance_info(instance,
old_instance_type)
migration.status = 'finished'
with migration.obj_as_admin():
migration.save()
instance.vm_state = vm_states.RESIZED
instance.task_state = None
instance.launched_at = timeutils.utcnow()
instance.save(expected_task_state=task_states.RESIZE_FINISH)
self._update_scheduler_instance_info(context, instance)
self._notify_about_instance_usage(
context, instance, "finish_resize.end",
network_info=network_info)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@errors_out_migration
@wrap_instance_fault
def finish_resize(self, context, disk_info, image, instance,
reservations, migration):
"""Completes the migration process.
Sets up the newly transferred disk and turns on the instance at its
new host machine.
"""
quotas = objects.Quotas.from_reservations(context,
reservations,
instance=instance)
try:
image_meta = objects.ImageMeta.from_dict(image)
self._finish_resize(context, instance, migration,
disk_info, image_meta)
quotas.commit()
except Exception:
LOG.exception(_LE('Setting instance vm_state to ERROR'),
instance=instance)
with excutils.save_and_reraise_exception():
try:
quotas.rollback()
except Exception:
LOG.exception(_LE("Failed to rollback quota for failed "
"finish_resize"),
instance=instance)
self._set_instance_obj_error_state(context, instance)
@wrap_exception()
@wrap_instance_fault
def add_fixed_ip_to_instance(self, context, network_id, instance):
"""Calls network_api to add new fixed_ip to instance
then injects the new network info and resets instance networking.
"""
self._notify_about_instance_usage(
context, instance, "create_ip.start")
network_info = self.network_api.add_fixed_ip_to_instance(context,
instance,
network_id)
self._inject_network_info(context, instance, network_info)
self.reset_network(context, instance)
# NOTE(russellb) We just want to bump updated_at. See bug 1143466.
instance.updated_at = timeutils.utcnow()
instance.save()
self._notify_about_instance_usage(
context, instance, "create_ip.end", network_info=network_info)
@wrap_exception()
@wrap_instance_fault
def remove_fixed_ip_from_instance(self, context, address, instance):
"""Calls network_api to remove existing fixed_ip from instance
by injecting the altered network info and resetting
instance networking.
"""
self._notify_about_instance_usage(
context, instance, "delete_ip.start")
network_info = self.network_api.remove_fixed_ip_from_instance(context,
instance,
address)
self._inject_network_info(context, instance, network_info)
self.reset_network(context, instance)
# NOTE(russellb) We just want to bump updated_at. See bug 1143466.
instance.updated_at = timeutils.utcnow()
instance.save()
self._notify_about_instance_usage(
context, instance, "delete_ip.end", network_info=network_info)
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def pause_instance(self, context, instance):
"""Pause an instance on this host."""
context = context.elevated()
LOG.info(_LI('Pausing'), context=context, instance=instance)
self._notify_about_instance_usage(context, instance, 'pause.start')
self.driver.pause(instance)
instance.power_state = self._get_power_state(context, instance)
instance.vm_state = vm_states.PAUSED
instance.task_state = None
instance.save(expected_task_state=task_states.PAUSING)
self._notify_about_instance_usage(context, instance, 'pause.end')
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def unpause_instance(self, context, instance):
"""Unpause a paused instance on this host."""
context = context.elevated()
LOG.info(_LI('Unpausing'), context=context, instance=instance)
self._notify_about_instance_usage(context, instance, 'unpause.start')
self.driver.unpause(instance)
instance.power_state = self._get_power_state(context, instance)
instance.vm_state = vm_states.ACTIVE
instance.task_state = None
instance.save(expected_task_state=task_states.UNPAUSING)
self._notify_about_instance_usage(context, instance, 'unpause.end')
@wrap_exception()
def host_power_action(self, context, action):
"""Reboots, shuts down or powers up the host."""
return self.driver.host_power_action(action)
@wrap_exception()
def host_maintenance_mode(self, context, host, mode):
"""Start/Stop host maintenance window. On start, it triggers
guest VMs evacuation.
"""
return self.driver.host_maintenance_mode(host, mode)
@wrap_exception()
def set_host_enabled(self, context, enabled):
"""Sets the specified host's ability to accept new instances."""
return self.driver.set_host_enabled(enabled)
@wrap_exception()
def get_host_uptime(self, context):
"""Returns the result of calling "uptime" on the target host."""
return self.driver.get_host_uptime()
@wrap_exception()
@wrap_instance_fault
def get_diagnostics(self, context, instance):
"""Retrieve diagnostics for an instance on this host."""
current_power_state = self._get_power_state(context, instance)
if current_power_state == power_state.RUNNING:
LOG.info(_LI("Retrieving diagnostics"), context=context,
instance=instance)
return self.driver.get_diagnostics(instance)
else:
raise exception.InstanceInvalidState(
attr='power_state',
instance_uuid=instance.uuid,
state=instance.power_state,
method='get_diagnostics')
@object_compat
@wrap_exception()
@wrap_instance_fault
def get_instance_diagnostics(self, context, instance):
"""Retrieve diagnostics for an instance on this host."""
current_power_state = self._get_power_state(context, instance)
if current_power_state == power_state.RUNNING:
LOG.info(_LI("Retrieving diagnostics"), context=context,
instance=instance)
diags = self.driver.get_instance_diagnostics(instance)
return diags.serialize()
else:
raise exception.InstanceInvalidState(
attr='power_state',
instance_uuid=instance.uuid,
state=instance.power_state,
method='get_diagnostics')
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def suspend_instance(self, context, instance):
"""Suspend the given instance."""
context = context.elevated()
# Store the old state
instance.system_metadata['old_vm_state'] = instance.vm_state
self._notify_about_instance_usage(context, instance, 'suspend.start')
with self._error_out_instance_on_exception(context, instance,
instance_state=instance.vm_state):
self.driver.suspend(context, instance)
instance.power_state = self._get_power_state(context, instance)
instance.vm_state = vm_states.SUSPENDED
instance.task_state = None
instance.save(expected_task_state=task_states.SUSPENDING)
self._notify_about_instance_usage(context, instance, 'suspend.end')
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def resume_instance(self, context, instance):
"""Resume the given suspended instance."""
context = context.elevated()
LOG.info(_LI('Resuming'), context=context, instance=instance)
self._notify_about_instance_usage(context, instance, 'resume.start')
network_info = self.network_api.get_instance_nw_info(context, instance)
block_device_info = self._get_instance_block_device_info(
context, instance)
with self._error_out_instance_on_exception(context, instance,
instance_state=instance.vm_state):
self.driver.resume(context, instance, network_info,
block_device_info)
instance.power_state = self._get_power_state(context, instance)
# We default to the ACTIVE state for backwards compatibility
instance.vm_state = instance.system_metadata.pop('old_vm_state',
vm_states.ACTIVE)
instance.task_state = None
instance.save(expected_task_state=task_states.RESUMING)
self._notify_about_instance_usage(context, instance, 'resume.end')
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def shelve_instance(self, context, instance, image_id,
clean_shutdown):
"""Shelve an instance.
This should be used when you want to take a snapshot of the instance.
It also adds system_metadata that can be used by a periodic task to
offload the shelved instance after a period of time.
:param context: request context
:param instance: an Instance object
:param image_id: an image id to snapshot to.
:param clean_shutdown: give the GuestOS a chance to stop
"""
compute_utils.notify_usage_exists(self.notifier, context, instance,
current_period=True)
self._notify_about_instance_usage(context, instance, 'shelve.start')
def update_task_state(task_state, expected_state=task_states.SHELVING):
shelving_state_map = {
task_states.IMAGE_PENDING_UPLOAD:
task_states.SHELVING_IMAGE_PENDING_UPLOAD,
task_states.IMAGE_UPLOADING:
task_states.SHELVING_IMAGE_UPLOADING,
task_states.SHELVING: task_states.SHELVING}
task_state = shelving_state_map[task_state]
expected_state = shelving_state_map[expected_state]
instance.task_state = task_state
instance.save(expected_task_state=expected_state)
self._power_off_instance(context, instance, clean_shutdown)
self.driver.snapshot(context, instance, image_id, update_task_state)
instance.system_metadata['shelved_at'] = timeutils.utcnow().isoformat()
instance.system_metadata['shelved_image_id'] = image_id
instance.system_metadata['shelved_host'] = self.host
instance.vm_state = vm_states.SHELVED
instance.task_state = None
if CONF.shelved_offload_time == 0:
instance.task_state = task_states.SHELVING_OFFLOADING
instance.power_state = self._get_power_state(context, instance)
instance.save(expected_task_state=[
task_states.SHELVING,
task_states.SHELVING_IMAGE_UPLOADING])
self._notify_about_instance_usage(context, instance, 'shelve.end')
if CONF.shelved_offload_time == 0:
self.shelve_offload_instance(context, instance,
clean_shutdown=False)
@wrap_exception()
@reverts_task_state
@wrap_instance_fault
def shelve_offload_instance(self, context, instance, clean_shutdown):
"""Remove a shelved instance from the hypervisor.
This frees up those resources for use by other instances, but may lead
to slower unshelve times for this instance. This method is used by
volume backed instances since restoring them doesn't involve the
potentially large download of an image.
:param context: request context
:param instance: nova.objects.instance.Instance
:param clean_shutdown: give the GuestOS a chance to stop
"""
self._notify_about_instance_usage(context, instance,
'shelve_offload.start')
self._power_off_instance(context, instance, clean_shutdown)
current_power_state = self._get_power_state(context, instance)
self.network_api.cleanup_instance_network_on_host(context, instance,
instance.host)
network_info = self.network_api.get_instance_nw_info(context, instance)
block_device_info = self._get_instance_block_device_info(context,
instance)
self.driver.destroy(context, instance, network_info,
block_device_info)
instance.power_state = current_power_state
instance.host = None
instance.node = None
instance.vm_state = vm_states.SHELVED_OFFLOADED
instance.task_state = None
instance.save(expected_task_state=[task_states.SHELVING,
task_states.SHELVING_OFFLOADING])
self._delete_scheduler_instance_info(context, instance.uuid)
self._notify_about_instance_usage(context, instance,
'shelve_offload.end')
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def unshelve_instance(self, context, instance, image,
filter_properties, node):
"""Unshelve the instance.
:param context: request context
:param instance: a nova.objects.instance.Instance object
:param image: an image to build from. If None we assume a
volume backed instance.
:param filter_properties: dict containing limits, retry info etc.
:param node: target compute node
"""
if filter_properties is None:
filter_properties = {}
@utils.synchronized(instance.uuid)
def do_unshelve_instance():
self._unshelve_instance(context, instance, image,
filter_properties, node)
do_unshelve_instance()
def _unshelve_instance_key_scrub(self, instance):
"""Remove data from the instance that may cause side effects."""
cleaned_keys = dict(
key_data=instance.key_data,
auto_disk_config=instance.auto_disk_config)
instance.key_data = None
instance.auto_disk_config = False
return cleaned_keys
def _unshelve_instance_key_restore(self, instance, keys):
"""Restore previously scrubbed keys before saving the instance."""
instance.update(keys)
def _unshelve_instance(self, context, instance, image, filter_properties,
node):
self._notify_about_instance_usage(context, instance, 'unshelve.start')
instance.task_state = task_states.SPAWNING
instance.save()
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
block_device_info = self._prep_block_device(context, instance, bdms,
do_check_attach=False)
scrubbed_keys = self._unshelve_instance_key_scrub(instance)
if node is None:
node = self.driver.get_available_nodes()[0]
LOG.debug('No node specified, defaulting to %s', node,
instance=instance)
rt = self._get_resource_tracker(node)
limits = filter_properties.get('limits', {})
shelved_image_ref = instance.image_ref
if image:
instance.image_ref = image['id']
image_meta = objects.ImageMeta.from_dict(image)
else:
image_meta = objects.ImageMeta.from_dict(
utils.get_image_from_system_metadata(
instance.system_metadata))
self.network_api.setup_instance_network_on_host(context, instance,
self.host)
network_info = self.network_api.get_instance_nw_info(context, instance)
try:
with rt.instance_claim(context, instance, limits):
self.driver.spawn(context, instance, image_meta,
injected_files=[],
admin_password=None,
network_info=network_info,
block_device_info=block_device_info)
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_LE('Instance failed to spawn'),
instance=instance)
if image:
instance.image_ref = shelved_image_ref
self._delete_snapshot_of_shelved_instance(context, instance,
image['id'])
self._unshelve_instance_key_restore(instance, scrubbed_keys)
self._update_instance_after_spawn(context, instance)
# Delete system_metadata for a shelved instance
compute_utils.remove_shelved_keys_from_system_metadata(instance)
instance.save(expected_task_state=task_states.SPAWNING)
self._update_scheduler_instance_info(context, instance)
self._notify_about_instance_usage(context, instance, 'unshelve.end')
@messaging.expected_exceptions(NotImplementedError)
@wrap_instance_fault
def reset_network(self, context, instance):
"""Reset networking on the given instance."""
LOG.debug('Reset network', context=context, instance=instance)
self.driver.reset_network(instance)
def _inject_network_info(self, context, instance, network_info):
"""Inject network info for the given instance."""
LOG.debug('Inject network info', context=context, instance=instance)
LOG.debug('network_info to inject: |%s|', network_info,
instance=instance)
self.driver.inject_network_info(instance,
network_info)
@wrap_instance_fault
def inject_network_info(self, context, instance):
"""Inject network info, but don't return the info."""
network_info = self.network_api.get_instance_nw_info(context, instance)
self._inject_network_info(context, instance, network_info)
@messaging.expected_exceptions(NotImplementedError,
exception.InstanceNotFound)
@wrap_exception()
@wrap_instance_fault
def get_console_output(self, context, instance, tail_length):
"""Send the console output for the given instance."""
context = context.elevated()
LOG.info(_LI("Get console output"), context=context,
instance=instance)
output = self.driver.get_console_output(context, instance)
if type(output) is six.text_type:
# the console output will be bytes.
output = six.b(output)
if tail_length is not None:
output = self._tail_log(output, tail_length)
return output.decode('utf-8', 'replace').encode('ascii', 'replace')
def _tail_log(self, log, length):
try:
length = int(length)
except ValueError:
length = 0
if length == 0:
return b''
else:
return b'\n'.join(log.split(b'\n')[-int(length):])
@messaging.expected_exceptions(exception.ConsoleTypeInvalid,
exception.InstanceNotReady,
exception.InstanceNotFound,
exception.ConsoleTypeUnavailable,
NotImplementedError)
@wrap_exception()
@wrap_instance_fault
def get_vnc_console(self, context, console_type, instance):
"""Return connection information for a vnc console."""
context = context.elevated()
LOG.debug("Getting vnc console", instance=instance)
token = str(uuid.uuid4())
if not CONF.vnc.enabled:
raise exception.ConsoleTypeUnavailable(console_type=console_type)
if console_type == 'novnc':
# For essex, novncproxy_base_url must include the full path
# including the html file (like http://myhost/vnc_auto.html)
access_url = '%s?token=%s' % (CONF.vnc.novncproxy_base_url, token)
elif console_type == 'xvpvnc':
access_url = '%s?token=%s' % (CONF.vnc.xvpvncproxy_base_url, token)
else:
raise exception.ConsoleTypeInvalid(console_type=console_type)
try:
# Retrieve connect info from driver, and then decorate with our
# access info token
console = self.driver.get_vnc_console(context, instance)
connect_info = console.get_connection_info(token, access_url)
except exception.InstanceNotFound:
if instance.vm_state != vm_states.BUILDING:
raise
raise exception.InstanceNotReady(instance_id=instance.uuid)
return connect_info
@messaging.expected_exceptions(exception.ConsoleTypeInvalid,
exception.InstanceNotReady,
exception.InstanceNotFound,
exception.ConsoleTypeUnavailable,
NotImplementedError)
@wrap_exception()
@wrap_instance_fault
def get_spice_console(self, context, console_type, instance):
"""Return connection information for a spice console."""
context = context.elevated()
LOG.debug("Getting spice console", instance=instance)
token = str(uuid.uuid4())
if not CONF.spice.enabled:
raise exception.ConsoleTypeUnavailable(console_type=console_type)
if console_type == 'spice-html5':
# For essex, spicehtml5proxy_base_url must include the full path
# including the html file (like http://myhost/spice_auto.html)
access_url = '%s?token=%s' % (CONF.spice.html5proxy_base_url,
token)
else:
raise exception.ConsoleTypeInvalid(console_type=console_type)
try:
# Retrieve connect info from driver, and then decorate with our
# access info token
console = self.driver.get_spice_console(context, instance)
connect_info = console.get_connection_info(token, access_url)
except exception.InstanceNotFound:
if instance.vm_state != vm_states.BUILDING:
raise
raise exception.InstanceNotReady(instance_id=instance.uuid)
return connect_info
@messaging.expected_exceptions(exception.ConsoleTypeInvalid,
exception.InstanceNotReady,
exception.InstanceNotFound,
exception.ConsoleTypeUnavailable,
NotImplementedError)
@wrap_exception()
@wrap_instance_fault
def get_rdp_console(self, context, console_type, instance):
"""Return connection information for a RDP console."""
context = context.elevated()
LOG.debug("Getting RDP console", instance=instance)
token = str(uuid.uuid4())
if not CONF.rdp.enabled:
raise exception.ConsoleTypeUnavailable(console_type=console_type)
if console_type == 'rdp-html5':
access_url = '%s?token=%s' % (CONF.rdp.html5_proxy_base_url,
token)
else:
raise exception.ConsoleTypeInvalid(console_type=console_type)
try:
# Retrieve connect info from driver, and then decorate with our
# access info token
console = self.driver.get_rdp_console(context, instance)
connect_info = console.get_connection_info(token, access_url)
except exception.InstanceNotFound:
if instance.vm_state != vm_states.BUILDING:
raise
raise exception.InstanceNotReady(instance_id=instance.uuid)
return connect_info
@messaging.expected_exceptions(exception.ConsoleTypeInvalid,
exception.InstanceNotReady,
exception.InstanceNotFound,
exception.ConsoleTypeUnavailable,
NotImplementedError)
@wrap_exception()
@wrap_instance_fault
def get_mks_console(self, context, console_type, instance):
"""Return connection information for a MKS console."""
context = context.elevated()
LOG.debug("Getting MKS console", instance=instance)
token = str(uuid.uuid4())
if not CONF.mks.enabled:
raise exception.ConsoleTypeUnavailable(console_type=console_type)
if console_type == 'webmks':
access_url = '%s?token=%s' % (CONF.mks.mksproxy_base_url,
token)
else:
raise exception.ConsoleTypeInvalid(console_type=console_type)
try:
# Retrieve connect info from driver, and then decorate with our
# access info token
console = self.driver.get_mks_console(context, instance)
connect_info = console.get_connection_info(token, access_url)
except exception.InstanceNotFound:
if instance.vm_state != vm_states.BUILDING:
raise
raise exception.InstanceNotReady(instance_id=instance.uuid)
return connect_info
@messaging.expected_exceptions(
exception.ConsoleTypeInvalid,
exception.InstanceNotReady,
exception.InstanceNotFound,
exception.ConsoleTypeUnavailable,
exception.SocketPortRangeExhaustedException,
exception.ImageSerialPortNumberInvalid,
exception.ImageSerialPortNumberExceedFlavorValue,
NotImplementedError)
@wrap_exception()
@wrap_instance_fault
def get_serial_console(self, context, console_type, instance):
"""Returns connection information for a serial console."""
LOG.debug("Getting serial console", instance=instance)
if not CONF.serial_console.enabled:
raise exception.ConsoleTypeUnavailable(console_type=console_type)
context = context.elevated()
token = str(uuid.uuid4())
access_url = '%s?token=%s' % (CONF.serial_console.base_url, token)
try:
# Retrieve connect info from driver, and then decorate with our
# access info token
console = self.driver.get_serial_console(context, instance)
connect_info = console.get_connection_info(token, access_url)
except exception.InstanceNotFound:
if instance.vm_state != vm_states.BUILDING:
raise
raise exception.InstanceNotReady(instance_id=instance.uuid)
return connect_info
@messaging.expected_exceptions(exception.ConsoleTypeInvalid,
exception.InstanceNotReady,
exception.InstanceNotFound)
@wrap_exception()
@wrap_instance_fault
def validate_console_port(self, ctxt, instance, port, console_type):
if console_type == "spice-html5":
console_info = self.driver.get_spice_console(ctxt, instance)
elif console_type == "rdp-html5":
console_info = self.driver.get_rdp_console(ctxt, instance)
elif console_type == "serial":
console_info = self.driver.get_serial_console(ctxt, instance)
elif console_type == "webmks":
console_info = self.driver.get_mks_console(ctxt, instance)
else:
console_info = self.driver.get_vnc_console(ctxt, instance)
return console_info.port == port
@wrap_exception()
@reverts_task_state
@wrap_instance_fault
def reserve_block_device_name(self, context, instance, device,
volume_id, disk_bus, device_type):
@utils.synchronized(instance.uuid)
def do_reserve():
bdms = (
objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid))
# NOTE(ndipanov): We need to explicitly set all the fields on the
# object so that obj_load_attr does not fail
new_bdm = objects.BlockDeviceMapping(
context=context,
source_type='volume', destination_type='volume',
instance_uuid=instance.uuid, boot_index=None,
volume_id=volume_id,
device_name=device, guest_format=None,
disk_bus=disk_bus, device_type=device_type)
new_bdm.device_name = self._get_device_name_for_instance(
instance, bdms, new_bdm)
# NOTE(vish): create bdm here to avoid race condition
new_bdm.create()
return new_bdm
return do_reserve()
@wrap_exception()
@wrap_instance_fault
def attach_volume(self, context, instance, bdm):
"""Attach a volume to an instance."""
driver_bdm = driver_block_device.convert_volume(bdm)
@utils.synchronized(instance.uuid)
def do_attach_volume(context, instance, driver_bdm):
try:
return self._attach_volume(context, instance, driver_bdm)
except Exception:
with excutils.save_and_reraise_exception():
bdm.destroy()
do_attach_volume(context, instance, driver_bdm)
def _attach_volume(self, context, instance, bdm):
context = context.elevated()
LOG.info(_LI('Attaching volume %(volume_id)s to %(mountpoint)s'),
{'volume_id': bdm.volume_id,
'mountpoint': bdm['mount_device']},
context=context, instance=instance)
try:
bdm.attach(context, instance, self.volume_api, self.driver,
do_check_attach=False, do_driver_attach=True)
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_LE("Failed to attach %(volume_id)s "
"at %(mountpoint)s"),
{'volume_id': bdm.volume_id,
'mountpoint': bdm['mount_device']},
context=context, instance=instance)
self.volume_api.unreserve_volume(context, bdm.volume_id)
info = {'volume_id': bdm.volume_id}
self._notify_about_instance_usage(
context, instance, "volume.attach", extra_usage_info=info)
def _driver_detach_volume(self, context, instance, bdm):
"""Do the actual driver detach using block device mapping."""
mp = bdm.device_name
volume_id = bdm.volume_id
LOG.info(_LI('Detach volume %(volume_id)s from mountpoint %(mp)s'),
{'volume_id': volume_id, 'mp': mp},
context=context, instance=instance)
connection_info = jsonutils.loads(bdm.connection_info)
# NOTE(vish): We currently don't use the serial when disconnecting,
# but added for completeness in case we ever do.
if connection_info and 'serial' not in connection_info:
connection_info['serial'] = volume_id
try:
if not self.driver.instance_exists(instance):
LOG.warning(_LW('Detaching volume from unknown instance'),
context=context, instance=instance)
encryption = encryptors.get_encryption_metadata(
context, self.volume_api, volume_id, connection_info)
self.driver.detach_volume(connection_info,
instance,
mp,
encryption=encryption)
except exception.DiskNotFound as err:
LOG.warning(_LW('Ignoring DiskNotFound exception while detaching '
'volume %(volume_id)s from %(mp)s: %(err)s'),
{'volume_id': volume_id, 'mp': mp, 'err': err},
instance=instance)
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_LE('Failed to detach volume %(volume_id)s '
'from %(mp)s'),
{'volume_id': volume_id, 'mp': mp},
context=context, instance=instance)
self.volume_api.roll_detaching(context, volume_id)
def _detach_volume(self, context, volume_id, instance, destroy_bdm=True,
attachment_id=None):
"""Detach a volume from an instance.
:param context: security context
:param volume_id: the volume id
:param instance: the Instance object to detach the volume from
:param destroy_bdm: if True, the corresponding BDM entry will be marked
as deleted. Disabling this is useful for operations
like rebuild, when we don't want to destroy BDM
"""
bdm = objects.BlockDeviceMapping.get_by_volume_and_instance(
context, volume_id, instance.uuid)
if CONF.volume_usage_poll_interval > 0:
vol_stats = []
mp = bdm.device_name
# Handle bootable volumes which will not contain /dev/
if '/dev/' in mp:
mp = mp[5:]
try:
vol_stats = self.driver.block_stats(instance, mp)
except NotImplementedError:
pass
if vol_stats:
LOG.debug("Updating volume usage cache with totals",
instance=instance)
rd_req, rd_bytes, wr_req, wr_bytes, flush_ops = vol_stats
vol_usage = objects.VolumeUsage(context)
vol_usage.volume_id = volume_id
vol_usage.instance_uuid = instance.uuid
vol_usage.project_id = instance.project_id
vol_usage.user_id = instance.user_id
vol_usage.availability_zone = instance.availability_zone
vol_usage.curr_reads = rd_req
vol_usage.curr_read_bytes = rd_bytes
vol_usage.curr_writes = wr_req
vol_usage.curr_write_bytes = wr_bytes
vol_usage.save(update_totals=True)
self.notifier.info(context, 'volume.usage',
compute_utils.usage_volume_info(vol_usage))
self._driver_detach_volume(context, instance, bdm)
connector = self.driver.get_volume_connector(instance)
self.volume_api.terminate_connection(context, volume_id, connector)
if destroy_bdm:
bdm.destroy()
info = dict(volume_id=volume_id)
self._notify_about_instance_usage(
context, instance, "volume.detach", extra_usage_info=info)
self.volume_api.detach(context.elevated(), volume_id, instance.uuid,
attachment_id)
@wrap_exception()
@wrap_instance_fault
def detach_volume(self, context, volume_id, instance, attachment_id=None):
"""Detach a volume from an instance."""
self._detach_volume(context, volume_id, instance,
attachment_id=attachment_id)
def _init_volume_connection(self, context, new_volume_id,
old_volume_id, connector, instance, bdm):
new_cinfo = self.volume_api.initialize_connection(context,
new_volume_id,
connector)
old_cinfo = jsonutils.loads(bdm['connection_info'])
if old_cinfo and 'serial' not in old_cinfo:
old_cinfo['serial'] = old_volume_id
new_cinfo['serial'] = old_cinfo['serial']
return (old_cinfo, new_cinfo)
def _swap_volume(self, context, instance, bdm, connector,
old_volume_id, new_volume_id, resize_to):
mountpoint = bdm['device_name']
failed = False
new_cinfo = None
try:
old_cinfo, new_cinfo = self._init_volume_connection(context,
new_volume_id,
old_volume_id,
connector,
instance,
bdm)
LOG.debug("swap_volume: Calling driver volume swap with "
"connection infos: new: %(new_cinfo)s; "
"old: %(old_cinfo)s",
{'new_cinfo': new_cinfo, 'old_cinfo': old_cinfo},
contex=context, instance=instance)
self.driver.swap_volume(old_cinfo, new_cinfo, instance, mountpoint,
resize_to)
except Exception:
failed = True
with excutils.save_and_reraise_exception():
if new_cinfo:
msg = _LE("Failed to swap volume %(old_volume_id)s "
"for %(new_volume_id)s")
LOG.exception(msg, {'old_volume_id': old_volume_id,
'new_volume_id': new_volume_id},
context=context,
instance=instance)
else:
msg = _LE("Failed to connect to volume %(volume_id)s "
"with volume at %(mountpoint)s")
LOG.exception(msg, {'volume_id': new_volume_id,
'mountpoint': bdm['device_name']},
context=context,
instance=instance)
self.volume_api.roll_detaching(context, old_volume_id)
self.volume_api.unreserve_volume(context, new_volume_id)
finally:
conn_volume = new_volume_id if failed else old_volume_id
if new_cinfo:
LOG.debug("swap_volume: calling Cinder terminate_connection "
"for %(volume)s", {'volume': conn_volume},
context=context, instance=instance)
self.volume_api.terminate_connection(context,
conn_volume,
connector)
# If Cinder initiated the swap, it will keep
# the original ID
comp_ret = self.volume_api.migrate_volume_completion(
context,
old_volume_id,
new_volume_id,
error=failed)
LOG.debug("swap_volume: Cinder migrate_volume_completion "
"returned: %(comp_ret)s", {'comp_ret': comp_ret},
context=context, instance=instance)
return (comp_ret, new_cinfo)
@wrap_exception()
@reverts_task_state
@wrap_instance_fault
def swap_volume(self, context, old_volume_id, new_volume_id, instance):
"""Swap volume for an instance."""
context = context.elevated()
bdm = objects.BlockDeviceMapping.get_by_volume_and_instance(
context, old_volume_id, instance.uuid)
connector = self.driver.get_volume_connector(instance)
resize_to = 0
old_vol_size = self.volume_api.get(context, old_volume_id)['size']
new_vol_size = self.volume_api.get(context, new_volume_id)['size']
if new_vol_size > old_vol_size:
resize_to = new_vol_size
LOG.info(_LI('Swapping volume %(old_volume)s for %(new_volume)s'),
{'old_volume': old_volume_id, 'new_volume': new_volume_id},
context=context, instance=instance)
comp_ret, new_cinfo = self._swap_volume(context, instance,
bdm,
connector,
old_volume_id,
new_volume_id,
resize_to)
save_volume_id = comp_ret['save_volume_id']
# Update bdm
values = {
'connection_info': jsonutils.dumps(new_cinfo),
'delete_on_termination': False,
'source_type': 'volume',
'destination_type': 'volume',
'snapshot_id': None,
'volume_id': save_volume_id,
'no_device': None}
if resize_to:
values['volume_size'] = resize_to
LOG.debug("swap_volume: Updating volume %(volume_id)s BDM record with "
"%(updates)s", {'volume_id': bdm.volume_id,
'updates': values},
context=context, instance=instance)
bdm.update(values)
bdm.save()
@wrap_exception()
def remove_volume_connection(self, context, volume_id, instance):
"""Remove a volume connection using the volume api."""
# NOTE(vish): We don't want to actually mark the volume
# detached, or delete the bdm, just remove the
# connection from this host.
try:
bdm = objects.BlockDeviceMapping.get_by_volume_and_instance(
context, volume_id, instance.uuid)
self._driver_detach_volume(context, instance, bdm)
connector = self.driver.get_volume_connector(instance)
self.volume_api.terminate_connection(context, volume_id, connector)
except exception.NotFound:
pass
@wrap_exception()
@wrap_instance_fault
def attach_interface(self, context, instance, network_id, port_id,
requested_ip):
"""Use hotplug to add an network adapter to an instance."""
bind_host_id = self.driver.network_binding_host_id(context, instance)
network_info = self.network_api.allocate_port_for_instance(
context, instance, port_id, network_id, requested_ip,
bind_host_id=bind_host_id)
if len(network_info) != 1:
LOG.error(_LE('allocate_port_for_instance returned %(ports)s '
'ports'), {'ports': len(network_info)})
raise exception.InterfaceAttachFailed(
instance_uuid=instance.uuid)
image_meta = objects.ImageMeta.from_instance(instance)
try:
self.driver.attach_interface(instance, image_meta, network_info[0])
except exception.NovaException as ex:
port_id = network_info[0].get('id')
LOG.warn(_LW("attach interface failed , try to deallocate "
"port %(port_id)s, reason: %(msg)s"),
{'port_id': port_id, 'msg': ex},
instance=instance)
try:
self.network_api.deallocate_port_for_instance(
context, instance, port_id)
except Exception:
LOG.warn(_LW("deallocate port %(port_id)s failed"),
{'port_id': port_id}, instance=instance)
raise exception.InterfaceAttachFailed(
instance_uuid=instance.uuid)
return network_info[0]
@wrap_exception()
@wrap_instance_fault
def detach_interface(self, context, instance, port_id):
"""Detach an network adapter from an instance."""
network_info = instance.info_cache.network_info
condemned = None
for vif in network_info:
if vif['id'] == port_id:
condemned = vif
break
if condemned is None:
raise exception.PortNotFound(_("Port %s is not "
"attached") % port_id)
try:
self.driver.detach_interface(instance, condemned)
except exception.NovaException as ex:
LOG.warning(_LW("Detach interface failed, port_id=%(port_id)s,"
" reason: %(msg)s"),
{'port_id': port_id, 'msg': ex}, instance=instance)
raise exception.InterfaceDetachFailed(instance_uuid=instance.uuid)
else:
try:
self.network_api.deallocate_port_for_instance(
context, instance, port_id)
except Exception as ex:
with excutils.save_and_reraise_exception():
# Since this is a cast operation, log the failure for
# triage.
LOG.warning(_LW('Failed to deallocate port %(port_id)s '
'for instance. Error: %(error)s'),
{'port_id': port_id, 'error': ex},
instance=instance)
def _get_compute_info(self, context, host):
return objects.ComputeNode.get_first_node_by_host_for_old_compat(
context, host)
@wrap_exception()
def check_instance_shared_storage(self, ctxt, instance, data):
"""Check if the instance files are shared
:param ctxt: security context
:param instance: dict of instance data
:param data: result of driver.check_instance_shared_storage_local
Returns True if instance disks located on shared storage and
False otherwise.
"""
return self.driver.check_instance_shared_storage_remote(ctxt, data)
@wrap_exception()
@wrap_instance_event
@wrap_instance_fault
def check_can_live_migrate_destination(self, ctxt, instance,
block_migration, disk_over_commit):
"""Check if it is possible to execute live migration.
This runs checks on the destination host, and then calls
back to the source host to check the results.
:param context: security context
:param instance: dict of instance data
:param block_migration: if true, prepare for block migration
:param disk_over_commit: if true, allow disk over commit
:returns: a dict containing migration info
"""
return self._do_check_can_live_migrate_destination(ctxt, instance,
block_migration,
disk_over_commit)
def _do_check_can_live_migrate_destination(self, ctxt, instance,
block_migration,
disk_over_commit):
src_compute_info = obj_base.obj_to_primitive(
self._get_compute_info(ctxt, instance.host))
dst_compute_info = obj_base.obj_to_primitive(
self._get_compute_info(ctxt, CONF.host))
dest_check_data = self.driver.check_can_live_migrate_destination(ctxt,
instance, src_compute_info, dst_compute_info,
block_migration, disk_over_commit)
LOG.debug('destination check data is %s', dest_check_data)
try:
migrate_data = self.compute_rpcapi.\
check_can_live_migrate_source(ctxt, instance,
dest_check_data)
finally:
self.driver.check_can_live_migrate_destination_cleanup(ctxt,
dest_check_data)
return migrate_data
@wrap_exception()
@wrap_instance_event
@wrap_instance_fault
def check_can_live_migrate_source(self, ctxt, instance, dest_check_data):
"""Check if it is possible to execute live migration.
This checks if the live migration can succeed, based on the
results from check_can_live_migrate_destination.
:param ctxt: security context
:param instance: dict of instance data
:param dest_check_data: result of check_can_live_migrate_destination
:returns: a dict containing migration info
"""
is_volume_backed = self.compute_api.is_volume_backed_instance(ctxt,
instance)
got_migrate_data_object = isinstance(dest_check_data,
migrate_data_obj.LiveMigrateData)
if not got_migrate_data_object:
dest_check_data = \
migrate_data_obj.LiveMigrateData.detect_implementation(
dest_check_data)
dest_check_data.is_volume_backed = is_volume_backed
block_device_info = self._get_instance_block_device_info(
ctxt, instance, refresh_conn_info=True)
result = self.driver.check_can_live_migrate_source(ctxt, instance,
dest_check_data,
block_device_info)
if not got_migrate_data_object:
result = result.to_legacy_dict()
LOG.debug('source check data is %s', result)
return result
@wrap_exception()
@wrap_instance_event
@wrap_instance_fault
def pre_live_migration(self, context, instance, block_migration, disk,
migrate_data):
"""Preparations for live migration at dest host.
:param context: security context
:param instance: dict of instance data
:param block_migration: if true, prepare for block migration
:param migrate_data: if not None, it is a dict which holds data
required for live migration without shared
storage.
"""
LOG.debug('pre_live_migration data is %s', migrate_data)
got_migrate_data_object = isinstance(migrate_data,
migrate_data_obj.LiveMigrateData)
if not got_migrate_data_object:
migrate_data = \
migrate_data_obj.LiveMigrateData.detect_implementation(
migrate_data)
block_device_info = self._get_instance_block_device_info(
context, instance, refresh_conn_info=True)
network_info = self.network_api.get_instance_nw_info(context, instance)
self._notify_about_instance_usage(
context, instance, "live_migration.pre.start",
network_info=network_info)
migrate_data = self.driver.pre_live_migration(context,
instance,
block_device_info,
network_info,
disk,
migrate_data)
LOG.debug('driver pre_live_migration data is %s' % migrate_data)
# NOTE(tr3buchet): setup networks on destination host
self.network_api.setup_networks_on_host(context, instance,
self.host)
# Creating filters to hypervisors and firewalls.
# An example is that nova-instance-instance-xxx,
# which is written to libvirt.xml(Check "virsh nwfilter-list")
# This nwfilter is necessary on the destination host.
# In addition, this method is creating filtering rule
# onto destination host.
self.driver.ensure_filtering_rules_for_instance(instance,
network_info)
self._notify_about_instance_usage(
context, instance, "live_migration.pre.end",
network_info=network_info)
if not got_migrate_data_object and migrate_data:
migrate_data = migrate_data.to_legacy_dict(
pre_migration_result=True)
migrate_data = migrate_data['pre_live_migration_result']
LOG.debug('pre_live_migration result data is %s', migrate_data)
return migrate_data
def _do_live_migration(self, context, dest, instance, block_migration,
migration, migrate_data):
# NOTE(danms): We should enhance the RT to account for migrations
# and use the status field to denote when the accounting has been
# done on source/destination. For now, this is just here for status
# reporting
self._set_migration_status(migration, 'preparing')
got_migrate_data_object = isinstance(migrate_data,
migrate_data_obj.LiveMigrateData)
if not got_migrate_data_object:
migrate_data = \
migrate_data_obj.LiveMigrateData.detect_implementation(
migrate_data)
try:
if block_migration:
block_device_info = self._get_instance_block_device_info(
context, instance)
disk = self.driver.get_instance_disk_info(
instance, block_device_info=block_device_info)
else:
disk = None
migrate_data = self.compute_rpcapi.pre_live_migration(
context, instance,
block_migration, disk, dest, migrate_data)
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_LE('Pre live migration failed at %s'),
dest, instance=instance)
self._set_migration_status(migration, 'failed')
self._rollback_live_migration(context, instance, dest,
block_migration, migrate_data)
self._set_migration_status(migration, 'running')
if migrate_data:
migrate_data.migration = migration
LOG.debug('live_migration data is %s', migrate_data)
try:
self.driver.live_migration(context, instance, dest,
self._post_live_migration,
self._rollback_live_migration,
block_migration, migrate_data)
except Exception:
# Executing live migration
# live_migration might raises exceptions, but
# nothing must be recovered in this version.
LOG.exception(_LE('Live migration failed.'), instance=instance)
with excutils.save_and_reraise_exception():
self._set_migration_status(migration, 'failed')
@wrap_exception()
@wrap_instance_event
@wrap_instance_fault
def live_migration(self, context, dest, instance, block_migration,
migration, migrate_data):
"""Executing live migration.
:param context: security context
:param dest: destination host
:param instance: a nova.objects.instance.Instance object
:param block_migration: if true, prepare for block migration
:param migration: an nova.objects.Migration object
:param migrate_data: implementation specific params
"""
self._set_migration_status(migration, 'queued')
def dispatch_live_migration(*args, **kwargs):
with self._live_migration_semaphore:
self._do_live_migration(*args, **kwargs)
# NOTE(danms): We spawn here to return the RPC worker thread back to
# the pool. Since what follows could take a really long time, we don't
# want to tie up RPC workers.
utils.spawn_n(dispatch_live_migration,
context, dest, instance,
block_migration, migration,
migrate_data)
@wrap_exception()
@wrap_instance_fault
def live_migration_force_complete(self, context, instance, migration_id):
"""Force live migration to complete.
:param context: Security context
:param instance: The instance that is being migrated
:param migration_id: ID of ongoing migration
"""
migration = objects.Migration.get_by_id(context, migration_id)
if migration.status != 'running':
raise exception.InvalidMigrationState(migration_id=migration_id,
instance_uuid=instance.uuid,
state=migration.status,
method='force complete')
self._notify_about_instance_usage(
context, instance, 'live.migration.force.complete.start')
self.driver.live_migration_force_complete(instance)
self._notify_about_instance_usage(
context, instance, 'live.migration.force.complete.end')
def _live_migration_cleanup_flags(self, block_migration, migrate_data):
"""Determine whether disks or instance path need to be cleaned up after
live migration (at source on success, at destination on rollback)
Block migration needs empty image at destination host before migration
starts, so if any failure occurs, any empty images has to be deleted.
Also Volume backed live migration w/o shared storage needs to delete
newly created instance-xxx dir on the destination as a part of its
rollback process
:param block_migration: if true, it was a block migration
:param migrate_data: implementation specific data
:returns: (bool, bool) -- do_cleanup, destroy_disks
"""
# NOTE(angdraug): block migration wouldn't have been allowed if either
# block storage or instance path were shared
is_shared_block_storage = not block_migration
is_shared_instance_path = not block_migration
if isinstance(migrate_data, migrate_data_obj.LibvirtLiveMigrateData):
is_shared_block_storage = migrate_data.is_shared_block_storage
is_shared_instance_path = migrate_data.is_shared_instance_path
# No instance booting at source host, but instance dir
# must be deleted for preparing next block migration
# must be deleted for preparing next live migration w/o shared storage
do_cleanup = block_migration or not is_shared_instance_path
destroy_disks = not is_shared_block_storage
return (do_cleanup, destroy_disks)
@wrap_exception()
@wrap_instance_fault
def _post_live_migration(self, ctxt, instance,
dest, block_migration=False, migrate_data=None):
"""Post operations for live migration.
This method is called from live_migration
and mainly updating database record.
:param ctxt: security context
:param instance: instance dict
:param dest: destination host
:param block_migration: if true, prepare for block migration
:param migrate_data: if not None, it is a dict which has data
required for live migration without shared storage
"""
LOG.info(_LI('_post_live_migration() is started..'),
instance=instance)
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
ctxt, instance.uuid)
# Cleanup source host post live-migration
block_device_info = self._get_instance_block_device_info(
ctxt, instance, bdms=bdms)
self.driver.post_live_migration(ctxt, instance, block_device_info,
migrate_data)
# Detaching volumes.
connector = self.driver.get_volume_connector(instance)
for bdm in bdms:
# NOTE(vish): We don't want to actually mark the volume
# detached, or delete the bdm, just remove the
# connection from this host.
# remove the volume connection without detaching from hypervisor
# because the instance is not running anymore on the current host
if bdm.is_volume:
self.volume_api.terminate_connection(ctxt, bdm.volume_id,
connector)
# Releasing vlan.
# (not necessary in current implementation?)
network_info = self.network_api.get_instance_nw_info(ctxt, instance)
self._notify_about_instance_usage(ctxt, instance,
"live_migration._post.start",
network_info=network_info)
# Releasing security group ingress rule.
LOG.debug('Calling driver.unfilter_instance from _post_live_migration',
instance=instance)
self.driver.unfilter_instance(instance,
network_info)
migration = {'source_compute': self.host,
'dest_compute': dest, }
self.network_api.migrate_instance_start(ctxt,
instance,
migration)
destroy_vifs = False
try:
self.driver.post_live_migration_at_source(ctxt, instance,
network_info)
except NotImplementedError as ex:
LOG.debug(ex, instance=instance)
# For all hypervisors other than libvirt, there is a possibility
# they are unplugging networks from source node in the cleanup
# method
destroy_vifs = True
# Define domain at destination host, without doing it,
# pause/suspend/terminate do not work.
self.compute_rpcapi.post_live_migration_at_destination(ctxt,
instance, block_migration, dest)
do_cleanup, destroy_disks = self._live_migration_cleanup_flags(
block_migration, migrate_data)
if do_cleanup:
LOG.debug('Calling driver.cleanup from _post_live_migration',
instance=instance)
self.driver.cleanup(ctxt, instance, network_info,
destroy_disks=destroy_disks,
migrate_data=migrate_data,
destroy_vifs=destroy_vifs)
self.instance_events.clear_events_for_instance(instance)
# NOTE(timello): make sure we update available resources on source
# host even before next periodic task.
self.update_available_resource(ctxt)
self._update_scheduler_instance_info(ctxt, instance)
self._notify_about_instance_usage(ctxt, instance,
"live_migration._post.end",
network_info=network_info)
LOG.info(_LI('Migrating instance to %s finished successfully.'),
dest, instance=instance)
LOG.info(_LI("You may see the error \"libvirt: QEMU error: "
"Domain not found: no domain with matching name.\" "
"This error can be safely ignored."),
instance=instance)
self._clean_instance_console_tokens(ctxt, instance)
if migrate_data and migrate_data.obj_attr_is_set('migration'):
migrate_data.migration.status = 'completed'
migrate_data.migration.save()
def _consoles_enabled(self):
"""Returns whether a console is enable."""
return (CONF.vnc.enabled or CONF.spice.enabled or
CONF.rdp.enabled or CONF.serial_console.enabled or
CONF.mks.enabled)
def _clean_instance_console_tokens(self, ctxt, instance):
"""Clean console tokens stored for an instance."""
if self._consoles_enabled():
if CONF.cells.enable:
self.cells_rpcapi.consoleauth_delete_tokens(
ctxt, instance.uuid)
else:
self.consoleauth_rpcapi.delete_tokens_for_instance(
ctxt, instance.uuid)
@wrap_exception()
@wrap_instance_event
@wrap_instance_fault
def post_live_migration_at_destination(self, context, instance,
block_migration):
"""Post operations for live migration .
:param context: security context
:param instance: Instance dict
:param block_migration: if true, prepare for block migration
"""
LOG.info(_LI('Post operation of migration started'),
instance=instance)
# NOTE(tr3buchet): setup networks on destination host
# this is called a second time because
# multi_host does not create the bridge in
# plug_vifs
self.network_api.setup_networks_on_host(context, instance,
self.host)
migration = {'source_compute': instance.host,
'dest_compute': self.host, }
self.network_api.migrate_instance_finish(context,
instance,
migration)
network_info = self.network_api.get_instance_nw_info(context, instance)
self._notify_about_instance_usage(
context, instance, "live_migration.post.dest.start",
network_info=network_info)
block_device_info = self._get_instance_block_device_info(context,
instance)
self.driver.post_live_migration_at_destination(context, instance,
network_info,
block_migration, block_device_info)
# Restore instance state
current_power_state = self._get_power_state(context, instance)
node_name = None
prev_host = instance.host
try:
compute_node = self._get_compute_info(context, self.host)
node_name = compute_node.hypervisor_hostname
except exception.ComputeHostNotFound:
LOG.exception(_LE('Failed to get compute_info for %s'), self.host)
finally:
instance.host = self.host
instance.power_state = current_power_state
instance.task_state = None
instance.node = node_name
instance.save(expected_task_state=task_states.MIGRATING)
# NOTE(tr3buchet): tear down networks on source host
self.network_api.setup_networks_on_host(context, instance,
prev_host, teardown=True)
# NOTE(vish): this is necessary to update dhcp
self.network_api.setup_networks_on_host(context, instance, self.host)
self._notify_about_instance_usage(
context, instance, "live_migration.post.dest.end",
network_info=network_info)
@wrap_exception()
@wrap_instance_fault
def _rollback_live_migration(self, context, instance,
dest, block_migration, migrate_data=None):
"""Recovers Instance/volume state from migrating -> running.
:param context: security context
:param instance: nova.objects.instance.Instance object
:param dest:
This method is called from live migration src host.
This param specifies destination host.
:param block_migration: if true, prepare for block migration
:param migrate_data:
if not none, contains implementation specific data.
"""
instance.task_state = None
instance.save(expected_task_state=[task_states.MIGRATING])
if isinstance(migrate_data, dict):
migration = migrate_data.pop('migration', None)
migrate_data = \
migrate_data_obj.LiveMigrateData.detect_implementation(
migrate_data)
elif (isinstance(migrate_data, migrate_data_obj.LiveMigrateData) and
migrate_data.obj_attr_is_set('migration')):
migration = migrate_data.migration
else:
migration = None
# NOTE(tr3buchet): setup networks on source host (really it's re-setup)
self.network_api.setup_networks_on_host(context, instance, self.host)
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
for bdm in bdms:
if bdm.is_volume:
self.compute_rpcapi.remove_volume_connection(
context, instance, bdm.volume_id, dest)
self._notify_about_instance_usage(context, instance,
"live_migration._rollback.start")
do_cleanup, destroy_disks = self._live_migration_cleanup_flags(
block_migration, migrate_data)
if do_cleanup:
self.compute_rpcapi.rollback_live_migration_at_destination(
context, instance, dest, destroy_disks=destroy_disks,
migrate_data=migrate_data)
self._notify_about_instance_usage(context, instance,
"live_migration._rollback.end")
self._set_migration_status(migration, 'error')
@wrap_exception()
@wrap_instance_event
@wrap_instance_fault
def rollback_live_migration_at_destination(self, context, instance,
destroy_disks,
migrate_data):
"""Cleaning up image directory that is created pre_live_migration.
:param context: security context
:param instance: a nova.objects.instance.Instance object sent over rpc
"""
network_info = self.network_api.get_instance_nw_info(context, instance)
self._notify_about_instance_usage(
context, instance, "live_migration.rollback.dest.start",
network_info=network_info)
try:
# NOTE(tr3buchet): tear down networks on destination host
self.network_api.setup_networks_on_host(context, instance,
self.host, teardown=True)
except Exception:
with excutils.save_and_reraise_exception():
# NOTE(tdurakov): even if teardown networks fails driver
# should try to rollback live migration on destination.
LOG.exception(
_LE('An error occurred while deallocating network.'),
instance=instance)
finally:
# always run this even if setup_networks_on_host fails
# NOTE(vish): The mapping is passed in so the driver can disconnect
# from remote volumes if necessary
block_device_info = self._get_instance_block_device_info(context,
instance)
if isinstance(migrate_data, dict):
migrate_data = \
migrate_data_obj.LiveMigrateData.detect_implementation(
migrate_data)
self.driver.rollback_live_migration_at_destination(
context, instance, network_info, block_device_info,
destroy_disks=destroy_disks, migrate_data=migrate_data)
self._notify_about_instance_usage(
context, instance, "live_migration.rollback.dest.end",
network_info=network_info)
@periodic_task.periodic_task(
spacing=CONF.heal_instance_info_cache_interval)
def _heal_instance_info_cache(self, context):
"""Called periodically. On every call, try to update the
info_cache's network information for another instance by
calling to the network manager.
This is implemented by keeping a cache of uuids of instances
that live on this host. On each call, we pop one off of a
list, pull the DB record, and try the call to the network API.
If anything errors don't fail, as it's possible the instance
has been deleted, etc.
"""
heal_interval = CONF.heal_instance_info_cache_interval
if not heal_interval:
return
instance_uuids = getattr(self, '_instance_uuids_to_heal', [])
instance = None
LOG.debug('Starting heal instance info cache')
if not instance_uuids:
# The list of instances to heal is empty so rebuild it
LOG.debug('Rebuilding the list of instances to heal')
db_instances = objects.InstanceList.get_by_host(
context, self.host, expected_attrs=[], use_slave=True)
for inst in db_instances:
# We don't want to refresh the cache for instances
# which are building or deleting so don't put them
# in the list. If they are building they will get
# added to the list next time we build it.
if (inst.vm_state == vm_states.BUILDING):
LOG.debug('Skipping network cache update for instance '
'because it is Building.', instance=inst)
continue
if (inst.task_state == task_states.DELETING):
LOG.debug('Skipping network cache update for instance '
'because it is being deleted.', instance=inst)
continue
if not instance:
# Save the first one we find so we don't
# have to get it again
instance = inst
else:
instance_uuids.append(inst['uuid'])
self._instance_uuids_to_heal = instance_uuids
else:
# Find the next valid instance on the list
while instance_uuids:
try:
inst = objects.Instance.get_by_uuid(
context, instance_uuids.pop(0),
expected_attrs=['system_metadata', 'info_cache',
'flavor'],
use_slave=True)
except exception.InstanceNotFound:
# Instance is gone. Try to grab another.
continue
# Check the instance hasn't been migrated
if inst.host != self.host:
LOG.debug('Skipping network cache update for instance '
'because it has been migrated to another '
'host.', instance=inst)
# Check the instance isn't being deleting
elif inst.task_state == task_states.DELETING:
LOG.debug('Skipping network cache update for instance '
'because it is being deleted.', instance=inst)
else:
instance = inst
break
if instance:
# We have an instance now to refresh
try:
# Call to network API to get instance info.. this will
# force an update to the instance's info_cache
self.network_api.get_instance_nw_info(context, instance)
LOG.debug('Updated the network info_cache for instance',
instance=instance)
except exception.InstanceNotFound:
# Instance is gone.
LOG.debug('Instance no longer exists. Unable to refresh',
instance=instance)
return
except exception.InstanceInfoCacheNotFound:
# InstanceInfoCache is gone.
LOG.debug('InstanceInfoCache no longer exists. '
'Unable to refresh', instance=instance)
except Exception:
LOG.error(_LE('An error occurred while refreshing the network '
'cache.'), instance=instance, exc_info=True)
else:
LOG.debug("Didn't find any instances for network info cache "
"update.")
@periodic_task.periodic_task
def _poll_rebooting_instances(self, context):
if CONF.reboot_timeout > 0:
filters = {'task_state':
[task_states.REBOOTING,
task_states.REBOOT_STARTED,
task_states.REBOOT_PENDING],
'host': self.host}
rebooting = objects.InstanceList.get_by_filters(
context, filters, expected_attrs=[], use_slave=True)
to_poll = []
for instance in rebooting:
if timeutils.is_older_than(instance.updated_at,
CONF.reboot_timeout):
to_poll.append(instance)
self.driver.poll_rebooting_instances(CONF.reboot_timeout, to_poll)
@periodic_task.periodic_task
def _poll_rescued_instances(self, context):
if CONF.rescue_timeout > 0:
filters = {'vm_state': vm_states.RESCUED,
'host': self.host}
rescued_instances = objects.InstanceList.get_by_filters(
context, filters, expected_attrs=["system_metadata"],
use_slave=True)
to_unrescue = []
for instance in rescued_instances:
if timeutils.is_older_than(instance.launched_at,
CONF.rescue_timeout):
to_unrescue.append(instance)
for instance in to_unrescue:
self.compute_api.unrescue(context, instance)
@periodic_task.periodic_task
def _poll_unconfirmed_resizes(self, context):
if CONF.resize_confirm_window == 0:
return
migrations = objects.MigrationList.get_unconfirmed_by_dest_compute(
context, CONF.resize_confirm_window, self.host,
use_slave=True)
migrations_info = dict(migration_count=len(migrations),
confirm_window=CONF.resize_confirm_window)
if migrations_info["migration_count"] > 0:
LOG.info(_LI("Found %(migration_count)d unconfirmed migrations "
"older than %(confirm_window)d seconds"),
migrations_info)
def _set_migration_to_error(migration, reason, **kwargs):
LOG.warning(_LW("Setting migration %(migration_id)s to error: "
"%(reason)s"),
{'migration_id': migration['id'], 'reason': reason},
**kwargs)
migration.status = 'error'
with migration.obj_as_admin():
migration.save()
for migration in migrations:
instance_uuid = migration.instance_uuid
LOG.info(_LI("Automatically confirming migration "
"%(migration_id)s for instance %(instance_uuid)s"),
{'migration_id': migration.id,
'instance_uuid': instance_uuid})
expected_attrs = ['metadata', 'system_metadata']
try:
instance = objects.Instance.get_by_uuid(context,
instance_uuid, expected_attrs=expected_attrs,
use_slave=True)
except exception.InstanceNotFound:
reason = (_("Instance %s not found") %
instance_uuid)
_set_migration_to_error(migration, reason)
continue
if instance.vm_state == vm_states.ERROR:
reason = _("In ERROR state")
_set_migration_to_error(migration, reason,
instance=instance)
continue
# race condition: The instance in DELETING state should not be
# set the migration state to error, otherwise the instance in
# to be deleted which is in RESIZED state
# will not be able to confirm resize
if instance.task_state in [task_states.DELETING,
task_states.SOFT_DELETING]:
msg = ("Instance being deleted or soft deleted during resize "
"confirmation. Skipping.")
LOG.debug(msg, instance=instance)
continue
# race condition: This condition is hit when this method is
# called between the save of the migration record with a status of
# finished and the save of the instance object with a state of
# RESIZED. The migration record should not be set to error.
if instance.task_state == task_states.RESIZE_FINISH:
msg = ("Instance still resizing during resize "
"confirmation. Skipping.")
LOG.debug(msg, instance=instance)
continue
vm_state = instance.vm_state
task_state = instance.task_state
if vm_state != vm_states.RESIZED or task_state is not None:
reason = (_("In states %(vm_state)s/%(task_state)s, not "
"RESIZED/None") %
{'vm_state': vm_state,
'task_state': task_state})
_set_migration_to_error(migration, reason,
instance=instance)
continue
try:
self.compute_api.confirm_resize(context, instance,
migration=migration)
except Exception as e:
LOG.info(_LI("Error auto-confirming resize: %s. "
"Will retry later."),
e, instance=instance)
@periodic_task.periodic_task(spacing=CONF.shelved_poll_interval)
def _poll_shelved_instances(self, context):
if CONF.shelved_offload_time <= 0:
return
filters = {'vm_state': vm_states.SHELVED,
'task_state': None,
'host': self.host}
shelved_instances = objects.InstanceList.get_by_filters(
context, filters=filters, expected_attrs=['system_metadata'],
use_slave=True)
to_gc = []
for instance in shelved_instances:
sys_meta = instance.system_metadata
shelved_at = timeutils.parse_strtime(sys_meta['shelved_at'])
if timeutils.is_older_than(shelved_at, CONF.shelved_offload_time):
to_gc.append(instance)
for instance in to_gc:
try:
instance.task_state = task_states.SHELVING_OFFLOADING
instance.save(expected_task_state=(None,))
self.shelve_offload_instance(context, instance,
clean_shutdown=False)
except Exception:
LOG.exception(_LE('Periodic task failed to offload instance.'),
instance=instance)
@periodic_task.periodic_task
def _instance_usage_audit(self, context):
if not CONF.instance_usage_audit:
return
begin, end = utils.last_completed_audit_period()
if objects.TaskLog.get(context, 'instance_usage_audit', begin, end,
self.host):
return
instances = objects.InstanceList.get_active_by_window_joined(
context, begin, end, host=self.host,
expected_attrs=['system_metadata', 'info_cache', 'metadata'],
use_slave=True)
num_instances = len(instances)
errors = 0
successes = 0
LOG.info(_LI("Running instance usage audit for"
" host %(host)s from %(begin_time)s to "
"%(end_time)s. %(number_instances)s"
" instances."),
{'host': self.host,
'begin_time': begin,
'end_time': end,
'number_instances': num_instances})
start_time = time.time()
task_log = objects.TaskLog(context)
task_log.task_name = 'instance_usage_audit'
task_log.period_beginning = begin
task_log.period_ending = end
task_log.host = self.host
task_log.task_items = num_instances
task_log.message = 'Instance usage audit started...'
task_log.begin_task()
for instance in instances:
try:
compute_utils.notify_usage_exists(
self.notifier, context, instance,
ignore_missing_network_data=False)
successes += 1
except Exception:
LOG.exception(_LE('Failed to generate usage '
'audit for instance '
'on host %s'), self.host,
instance=instance)
errors += 1
task_log.errors = errors
task_log.message = (
'Instance usage audit ran for host %s, %s instances in %s seconds.'
% (self.host, num_instances, time.time() - start_time))
task_log.end_task()
@periodic_task.periodic_task(spacing=CONF.bandwidth_poll_interval)
def _poll_bandwidth_usage(self, context):
if not self._bw_usage_supported:
return
prev_time, start_time = utils.last_completed_audit_period()
curr_time = time.time()
if (curr_time - self._last_bw_usage_poll >
CONF.bandwidth_poll_interval):
self._last_bw_usage_poll = curr_time
LOG.info(_LI("Updating bandwidth usage cache"))
cells_update_interval = CONF.cells.bandwidth_update_interval
if (cells_update_interval > 0 and
curr_time - self._last_bw_usage_cell_update >
cells_update_interval):
self._last_bw_usage_cell_update = curr_time
update_cells = True
else:
update_cells = False
instances = objects.InstanceList.get_by_host(context,
self.host,
use_slave=True)
try:
bw_counters = self.driver.get_all_bw_counters(instances)
except NotImplementedError:
# NOTE(mdragon): Not all hypervisors have bandwidth polling
# implemented yet. If they don't it doesn't break anything,
# they just don't get the info in the usage events.
# NOTE(PhilDay): Record that its not supported so we can
# skip fast on future calls rather than waste effort getting
# the list of instances.
LOG.info(_LI("Bandwidth usage not supported by "
"hypervisor."))
self._bw_usage_supported = False
return
refreshed = timeutils.utcnow()
for bw_ctr in bw_counters:
# Allow switching of greenthreads between queries.
greenthread.sleep(0)
bw_in = 0
bw_out = 0
last_ctr_in = None
last_ctr_out = None
usage = objects.BandwidthUsage.get_by_instance_uuid_and_mac(
context, bw_ctr['uuid'], bw_ctr['mac_address'],
start_period=start_time, use_slave=True)
if usage:
bw_in = usage.bw_in
bw_out = usage.bw_out
last_ctr_in = usage.last_ctr_in
last_ctr_out = usage.last_ctr_out
else:
usage = (objects.BandwidthUsage.
get_by_instance_uuid_and_mac(
context, bw_ctr['uuid'], bw_ctr['mac_address'],
start_period=prev_time, use_slave=True))
if usage:
last_ctr_in = usage.last_ctr_in
last_ctr_out = usage.last_ctr_out
if last_ctr_in is not None:
if bw_ctr['bw_in'] < last_ctr_in:
# counter rollover
bw_in += bw_ctr['bw_in']
else:
bw_in += (bw_ctr['bw_in'] - last_ctr_in)
if last_ctr_out is not None:
if bw_ctr['bw_out'] < last_ctr_out:
# counter rollover
bw_out += bw_ctr['bw_out']
else:
bw_out += (bw_ctr['bw_out'] - last_ctr_out)
objects.BandwidthUsage(context=context).create(
bw_ctr['uuid'],
bw_ctr['mac_address'],
bw_in,
bw_out,
bw_ctr['bw_in'],
bw_ctr['bw_out'],
start_period=start_time,
last_refreshed=refreshed,
update_cells=update_cells)
def _get_host_volume_bdms(self, context, use_slave=False):
"""Return all block device mappings on a compute host."""
compute_host_bdms = []
instances = objects.InstanceList.get_by_host(context, self.host,
use_slave=use_slave)
for instance in instances:
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid, use_slave=use_slave)
instance_bdms = [bdm for bdm in bdms if bdm.is_volume]
compute_host_bdms.append(dict(instance=instance,
instance_bdms=instance_bdms))
return compute_host_bdms
def _update_volume_usage_cache(self, context, vol_usages):
"""Updates the volume usage cache table with a list of stats."""
for usage in vol_usages:
# Allow switching of greenthreads between queries.
greenthread.sleep(0)
vol_usage = objects.VolumeUsage(context)
vol_usage.volume_id = usage['volume']
vol_usage.instance_uuid = usage['instance'].uuid
vol_usage.project_id = usage['instance'].project_id
vol_usage.user_id = usage['instance'].user_id
vol_usage.availability_zone = usage['instance'].availability_zone
vol_usage.curr_reads = usage['rd_req']
vol_usage.curr_read_bytes = usage['rd_bytes']
vol_usage.curr_writes = usage['wr_req']
vol_usage.curr_write_bytes = usage['wr_bytes']
vol_usage.save()
self.notifier.info(context, 'volume.usage',
compute_utils.usage_volume_info(vol_usage))
@periodic_task.periodic_task(spacing=CONF.volume_usage_poll_interval)
def _poll_volume_usage(self, context):
if CONF.volume_usage_poll_interval == 0:
return
compute_host_bdms = self._get_host_volume_bdms(context,
use_slave=True)
if not compute_host_bdms:
return
LOG.debug("Updating volume usage cache")
try:
vol_usages = self.driver.get_all_volume_usage(context,
compute_host_bdms)
except NotImplementedError:
return
self._update_volume_usage_cache(context, vol_usages)
@periodic_task.periodic_task(spacing=CONF.sync_power_state_interval,
run_immediately=True)
def _sync_power_states(self, context):
"""Align power states between the database and the hypervisor.
To sync power state data we make a DB call to get the number of
virtual machines known by the hypervisor and if the number matches the
number of virtual machines known by the database, we proceed in a lazy
loop, one database record at a time, checking if the hypervisor has the
same power state as is in the database.
"""
db_instances = objects.InstanceList.get_by_host(context, self.host,
expected_attrs=[],
use_slave=True)
num_vm_instances = self.driver.get_num_instances()
num_db_instances = len(db_instances)
if num_vm_instances != num_db_instances:
LOG.warning(_LW("While synchronizing instance power states, found "
"%(num_db_instances)s instances in the database "
"and %(num_vm_instances)s instances on the "
"hypervisor."),
{'num_db_instances': num_db_instances,
'num_vm_instances': num_vm_instances})
def _sync(db_instance):
# NOTE(melwitt): This must be synchronized as we query state from
# two separate sources, the driver and the database.
# They are set (in stop_instance) and read, in sync.
@utils.synchronized(db_instance.uuid)
def query_driver_power_state_and_sync():
self._query_driver_power_state_and_sync(context, db_instance)
try:
query_driver_power_state_and_sync()
except Exception:
LOG.exception(_LE("Periodic sync_power_state task had an "
"error while processing an instance."),
instance=db_instance)
self._syncs_in_progress.pop(db_instance.uuid)
for db_instance in db_instances:
# process syncs asynchronously - don't want instance locking to
# block entire periodic task thread
uuid = db_instance.uuid
if uuid in self._syncs_in_progress:
LOG.debug('Sync already in progress for %s' % uuid)
else:
LOG.debug('Triggering sync for uuid %s' % uuid)
self._syncs_in_progress[uuid] = True
self._sync_power_pool.spawn_n(_sync, db_instance)
def _query_driver_power_state_and_sync(self, context, db_instance):
if db_instance.task_state is not None:
LOG.info(_LI("During sync_power_state the instance has a "
"pending task (%(task)s). Skip."),
{'task': db_instance.task_state}, instance=db_instance)
return
# No pending tasks. Now try to figure out the real vm_power_state.
try:
vm_instance = self.driver.get_info(db_instance)
vm_power_state = vm_instance.state
except exception.InstanceNotFound:
vm_power_state = power_state.NOSTATE
# Note(maoy): the above get_info call might take a long time,
# for example, because of a broken libvirt driver.
try:
self._sync_instance_power_state(context,
db_instance,
vm_power_state,
use_slave=True)
except exception.InstanceNotFound:
# NOTE(hanlind): If the instance gets deleted during sync,
# silently ignore.
pass
def _sync_instance_power_state(self, context, db_instance, vm_power_state,
use_slave=False):
"""Align instance power state between the database and hypervisor.
If the instance is not found on the hypervisor, but is in the database,
then a stop() API will be called on the instance.
"""
# We re-query the DB to get the latest instance info to minimize
# (not eliminate) race condition.
db_instance.refresh(use_slave=use_slave)
db_power_state = db_instance.power_state
vm_state = db_instance.vm_state
if self.host != db_instance.host:
# on the sending end of nova-compute _sync_power_state
# may have yielded to the greenthread performing a live
# migration; this in turn has changed the resident-host
# for the VM; However, the instance is still active, it
# is just in the process of migrating to another host.
# This implies that the compute source must relinquish
# control to the compute destination.
LOG.info(_LI("During the sync_power process the "
"instance has moved from "
"host %(src)s to host %(dst)s"),
{'src': db_instance.host,
'dst': self.host},
instance=db_instance)
return
elif db_instance.task_state is not None:
# on the receiving end of nova-compute, it could happen
# that the DB instance already report the new resident
# but the actual VM has not showed up on the hypervisor
# yet. In this case, let's allow the loop to continue
# and run the state sync in a later round
LOG.info(_LI("During sync_power_state the instance has a "
"pending task (%(task)s). Skip."),
{'task': db_instance.task_state},
instance=db_instance)
return
orig_db_power_state = db_power_state
if vm_power_state != db_power_state:
LOG.info(_LI('During _sync_instance_power_state the DB '
'power_state (%(db_power_state)s) does not match '
'the vm_power_state from the hypervisor '
'(%(vm_power_state)s). Updating power_state in the '
'DB to match the hypervisor.'),
{'db_power_state': db_power_state,
'vm_power_state': vm_power_state},
instance=db_instance)
# power_state is always updated from hypervisor to db
db_instance.power_state = vm_power_state
db_instance.save()
db_power_state = vm_power_state
# Note(maoy): Now resolve the discrepancy between vm_state and
# vm_power_state. We go through all possible vm_states.
if vm_state in (vm_states.BUILDING,
vm_states.RESCUED,
vm_states.RESIZED,
vm_states.SUSPENDED,
vm_states.ERROR):
# TODO(maoy): we ignore these vm_state for now.
pass
elif vm_state == vm_states.ACTIVE:
# The only rational power state should be RUNNING
if vm_power_state in (power_state.SHUTDOWN,
power_state.CRASHED):
LOG.warning(_LW("Instance shutdown by itself. Calling the "
"stop API. Current vm_state: %(vm_state)s, "
"current task_state: %(task_state)s, "
"original DB power_state: %(db_power_state)s, "
"current VM power_state: %(vm_power_state)s"),
{'vm_state': vm_state,
'task_state': db_instance.task_state,
'db_power_state': orig_db_power_state,
'vm_power_state': vm_power_state},
instance=db_instance)
try:
# Note(maoy): here we call the API instead of
# brutally updating the vm_state in the database
# to allow all the hooks and checks to be performed.
if db_instance.shutdown_terminate:
self.compute_api.delete(context, db_instance)
else:
self.compute_api.stop(context, db_instance)
except Exception:
# Note(maoy): there is no need to propagate the error
# because the same power_state will be retrieved next
# time and retried.
# For example, there might be another task scheduled.
LOG.exception(_LE("error during stop() in "
"sync_power_state."),
instance=db_instance)
elif vm_power_state == power_state.SUSPENDED:
LOG.warning(_LW("Instance is suspended unexpectedly. Calling "
"the stop API."), instance=db_instance)
try:
self.compute_api.stop(context, db_instance)
except Exception:
LOG.exception(_LE("error during stop() in "
"sync_power_state."),
instance=db_instance)
elif vm_power_state == power_state.PAUSED:
# Note(maoy): a VM may get into the paused state not only
# because the user request via API calls, but also
# due to (temporary) external instrumentations.
# Before the virt layer can reliably report the reason,
# we simply ignore the state discrepancy. In many cases,
# the VM state will go back to running after the external
# instrumentation is done. See bug 1097806 for details.
LOG.warning(_LW("Instance is paused unexpectedly. Ignore."),
instance=db_instance)
elif vm_power_state == power_state.NOSTATE:
# Occasionally, depending on the status of the hypervisor,
# which could be restarting for example, an instance may
# not be found. Therefore just log the condition.
LOG.warning(_LW("Instance is unexpectedly not found. Ignore."),
instance=db_instance)
elif vm_state == vm_states.STOPPED:
if vm_power_state not in (power_state.NOSTATE,
power_state.SHUTDOWN,
power_state.CRASHED):
LOG.warning(_LW("Instance is not stopped. Calling "
"the stop API. Current vm_state: %(vm_state)s,"
" current task_state: %(task_state)s, "
"original DB power_state: %(db_power_state)s, "
"current VM power_state: %(vm_power_state)s"),
{'vm_state': vm_state,
'task_state': db_instance.task_state,
'db_power_state': orig_db_power_state,
'vm_power_state': vm_power_state},
instance=db_instance)
try:
# NOTE(russellb) Force the stop, because normally the
# compute API would not allow an attempt to stop a stopped
# instance.
self.compute_api.force_stop(context, db_instance)
except Exception:
LOG.exception(_LE("error during stop() in "
"sync_power_state."),
instance=db_instance)
elif vm_state == vm_states.PAUSED:
if vm_power_state in (power_state.SHUTDOWN,
power_state.CRASHED):
LOG.warning(_LW("Paused instance shutdown by itself. Calling "
"the stop API."), instance=db_instance)
try:
self.compute_api.force_stop(context, db_instance)
except Exception:
LOG.exception(_LE("error during stop() in "
"sync_power_state."),
instance=db_instance)
elif vm_state in (vm_states.SOFT_DELETED,
vm_states.DELETED):
if vm_power_state not in (power_state.NOSTATE,
power_state.SHUTDOWN):
# Note(maoy): this should be taken care of periodically in
# _cleanup_running_deleted_instances().
LOG.warning(_LW("Instance is not (soft-)deleted."),
instance=db_instance)
@periodic_task.periodic_task
def _reclaim_queued_deletes(self, context):
"""Reclaim instances that are queued for deletion."""
interval = CONF.reclaim_instance_interval
if interval <= 0:
LOG.debug("CONF.reclaim_instance_interval <= 0, skipping...")
return
# TODO(comstud, jichenjc): Dummy quota object for now See bug 1296414.
# The only case that the quota might be inconsistent is
# the compute node died between set instance state to SOFT_DELETED
# and quota commit to DB. When compute node starts again
# it will have no idea the reservation is committed or not or even
# expired, since it's a rare case, so marked as todo.
quotas = objects.Quotas.from_reservations(context, None)
filters = {'vm_state': vm_states.SOFT_DELETED,
'task_state': None,
'host': self.host}
instances = objects.InstanceList.get_by_filters(
context, filters,
expected_attrs=objects.instance.INSTANCE_DEFAULT_FIELDS,
use_slave=True)
for instance in instances:
if self._deleted_old_enough(instance, interval):
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
LOG.info(_LI('Reclaiming deleted instance'), instance=instance)
try:
self._delete_instance(context, instance, bdms, quotas)
except Exception as e:
LOG.warning(_LW("Periodic reclaim failed to delete "
"instance: %s"),
e, instance=instance)
@periodic_task.periodic_task(spacing=CONF.update_resources_interval)
def update_available_resource(self, context):
"""See driver.get_available_resource()
Periodic process that keeps that the compute host's understanding of
resource availability and usage in sync with the underlying hypervisor.
:param context: security context
"""
new_resource_tracker_dict = {}
compute_nodes_in_db = self._get_compute_nodes_in_db(context,
use_slave=True)
nodenames = set(self.driver.get_available_nodes())
for nodename in nodenames:
rt = self._get_resource_tracker(nodename)
try:
rt.update_available_resource(context)
except exception.ComputeHostNotFound:
# NOTE(comstud): We can get to this case if a node was
# marked 'deleted' in the DB and then re-added with a
# different auto-increment id. The cached resource
# tracker tried to update a deleted record and failed.
# Don't add this resource tracker to the new dict, so
# that this will resolve itself on the next run.
LOG.info(_LI("Compute node '%s' not found in "
"update_available_resource."), nodename)
continue
except Exception:
LOG.exception(_LE("Error updating resources for node "
"%(node)s."), {'node': nodename})
new_resource_tracker_dict[nodename] = rt
# NOTE(comstud): Replace the RT cache before looping through
# compute nodes to delete below, as we can end up doing greenthread
# switches there. Best to have everyone using the newest cache
# ASAP.
self._resource_tracker_dict = new_resource_tracker_dict
# Delete orphan compute node not reported by driver but still in db
for cn in compute_nodes_in_db:
if cn.hypervisor_hostname not in nodenames:
LOG.info(_LI("Deleting orphan compute node %s") % cn.id)
cn.destroy()
def _get_compute_nodes_in_db(self, context, use_slave=False):
try:
return objects.ComputeNodeList.get_all_by_host(context, self.host,
use_slave=use_slave)
except exception.NotFound:
LOG.error(_LE("No compute node record for host %s"), self.host)
return []
@periodic_task.periodic_task(
spacing=CONF.running_deleted_instance_poll_interval)
def _cleanup_running_deleted_instances(self, context):
"""Cleanup any instances which are erroneously still running after
having been deleted.
Valid actions to take are:
1. noop - do nothing
2. log - log which instances are erroneously running
3. reap - shutdown and cleanup any erroneously running instances
4. shutdown - power off *and disable* any erroneously running
instances
The use-case for this cleanup task is: for various reasons, it may be
possible for the database to show an instance as deleted but for that
instance to still be running on a host machine (see bug
https://bugs.launchpad.net/nova/+bug/911366).
This cleanup task is a cross-hypervisor utility for finding these
zombied instances and either logging the discrepancy (likely what you
should do in production), or automatically reaping the instances (more
appropriate for dev environments).
"""
action = CONF.running_deleted_instance_action
if action == "noop":
return
# NOTE(sirp): admin contexts don't ordinarily return deleted records
with utils.temporary_mutation(context, read_deleted="yes"):
for instance in self._running_deleted_instances(context):
if action == "log":
LOG.warning(_LW("Detected instance with name label "
"'%s' which is marked as "
"DELETED but still present on host."),
instance.name, instance=instance)
elif action == 'shutdown':
LOG.info(_LI("Powering off instance with name label "
"'%s' which is marked as "
"DELETED but still present on host."),
instance.name, instance=instance)
try:
try:
# disable starting the instance
self.driver.set_bootable(instance, False)
except NotImplementedError:
LOG.debug("set_bootable is not implemented "
"for the current driver")
# and power it off
self.driver.power_off(instance)
except Exception:
msg = _LW("Failed to power off instance")
LOG.warn(msg, instance=instance, exc_info=True)
elif action == 'reap':
LOG.info(_LI("Destroying instance with name label "
"'%s' which is marked as "
"DELETED but still present on host."),
instance.name, instance=instance)
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid, use_slave=True)
self.instance_events.clear_events_for_instance(instance)
try:
self._shutdown_instance(context, instance, bdms,
notify=False)
self._cleanup_volumes(context, instance.uuid, bdms)
except Exception as e:
LOG.warning(_LW("Periodic cleanup failed to delete "
"instance: %s"),
e, instance=instance)
else:
raise Exception(_("Unrecognized value '%s'"
" for CONF.running_deleted_"
"instance_action") % action)
def _running_deleted_instances(self, context):
"""Returns a list of instances nova thinks is deleted,
but the hypervisor thinks is still running.
"""
timeout = CONF.running_deleted_instance_timeout
filters = {'deleted': True,
'soft_deleted': False,
'host': self.host}
instances = self._get_instances_on_driver(context, filters)
return [i for i in instances if self._deleted_old_enough(i, timeout)]
def _deleted_old_enough(self, instance, timeout):
deleted_at = instance.deleted_at
if deleted_at:
deleted_at = deleted_at.replace(tzinfo=None)
return (not deleted_at or timeutils.is_older_than(deleted_at, timeout))
@contextlib.contextmanager
def _error_out_instance_on_exception(self, context, instance,
quotas=None,
instance_state=vm_states.ACTIVE):
instance_uuid = instance.uuid
try:
yield
except NotImplementedError as error:
with excutils.save_and_reraise_exception():
if quotas:
quotas.rollback()
LOG.info(_LI("Setting instance back to %(state)s after: "
"%(error)s"),
{'state': instance_state, 'error': error},
instance_uuid=instance_uuid)
self._instance_update(context, instance,
vm_state=instance_state,
task_state=None)
except exception.InstanceFaultRollback as error:
if quotas:
quotas.rollback()
LOG.info(_LI("Setting instance back to ACTIVE after: %s"),
error, instance_uuid=instance_uuid)
self._instance_update(context, instance,
vm_state=vm_states.ACTIVE,
task_state=None)
raise error.inner_exception
except Exception:
LOG.exception(_LE('Setting instance vm_state to ERROR'),
instance_uuid=instance_uuid)
with excutils.save_and_reraise_exception():
if quotas:
quotas.rollback()
self._set_instance_obj_error_state(context, instance)
@wrap_exception()
def add_aggregate_host(self, context, aggregate, host, slave_info):
"""Notify hypervisor of change (for hypervisor pools)."""
try:
self.driver.add_to_aggregate(context, aggregate, host,
slave_info=slave_info)
except NotImplementedError:
LOG.debug('Hypervisor driver does not support '
'add_aggregate_host')
except exception.AggregateError:
with excutils.save_and_reraise_exception():
self.driver.undo_aggregate_operation(
context,
aggregate.delete_host,
aggregate, host)
@wrap_exception()
def remove_aggregate_host(self, context, host, slave_info, aggregate):
"""Removes a host from a physical hypervisor pool."""
try:
self.driver.remove_from_aggregate(context, aggregate, host,
slave_info=slave_info)
except NotImplementedError:
LOG.debug('Hypervisor driver does not support '
'remove_aggregate_host')
except (exception.AggregateError,
exception.InvalidAggregateAction) as e:
with excutils.save_and_reraise_exception():
self.driver.undo_aggregate_operation(
context,
aggregate.add_host,
aggregate, host,
isinstance(e, exception.AggregateError))
def _process_instance_event(self, instance, event):
_event = self.instance_events.pop_instance_event(instance, event)
if _event:
LOG.debug('Processing event %(event)s',
{'event': event.key}, instance=instance)
_event.send(event)
def _process_instance_vif_deleted_event(self, context, instance,
deleted_vif_id):
# If an attached port is deleted by neutron, it needs to
# be detached from the instance.
# And info cache needs to be updated.
network_info = instance.info_cache.network_info
for index, vif in enumerate(network_info):
if vif['id'] == deleted_vif_id:
LOG.info(_LI('Neutron deleted interface %(intf)s; '
'detaching it from the instance and '
'deleting it from the info cache'),
{'intf': vif['id']},
instance=instance)
del network_info[index]
base_net_api.update_instance_cache_with_nw_info(
self.network_api, context,
instance,
nw_info=network_info)
try:
self.driver.detach_interface(instance, vif)
except exception.NovaException as ex:
LOG.warning(_LW("Detach interface failed, "
"port_id=%(port_id)s, reason: %(msg)s"),
{'port_id': deleted_vif_id, 'msg': ex},
instance=instance)
break
@wrap_exception()
def external_instance_event(self, context, instances, events):
# NOTE(danms): Some event types are handled by the manager, such
# as when we're asked to update the instance's info_cache. If it's
# not one of those, look for some thread(s) waiting for the event and
# unblock them if so.
for event in events:
instance = [inst for inst in instances
if inst.uuid == event.instance_uuid][0]
LOG.debug('Received event %(event)s',
{'event': event.key},
instance=instance)
if event.name == 'network-changed':
try:
self.network_api.get_instance_nw_info(context, instance)
except exception.NotFound as e:
LOG.info(_LI('Failed to process external instance event '
'%(event)s due to: %(error)s'),
{'event': event.key, 'error': six.text_type(e)},
instance=instance)
elif event.name == 'network-vif-deleted':
self._process_instance_vif_deleted_event(context,
instance,
event.tag)
else:
self._process_instance_event(instance, event)
@periodic_task.periodic_task(spacing=CONF.image_cache_manager_interval,
external_process_ok=True)
def _run_image_cache_manager_pass(self, context):
"""Run a single pass of the image cache manager."""
if not self.driver.capabilities["has_imagecache"]:
return
# Determine what other nodes use this storage
storage_users.register_storage_use(CONF.instances_path, CONF.host)
nodes = storage_users.get_storage_users(CONF.instances_path)
# Filter all_instances to only include those nodes which share this
# storage path.
# TODO(mikal): this should be further refactored so that the cache
# cleanup code doesn't know what those instances are, just a remote
# count, and then this logic should be pushed up the stack.
filters = {'deleted': False,
'soft_deleted': True,
'host': nodes}
filtered_instances = objects.InstanceList.get_by_filters(context,
filters, expected_attrs=[], use_slave=True)
self.driver.manage_image_cache(context, filtered_instances)
@periodic_task.periodic_task(spacing=CONF.instance_delete_interval)
def _run_pending_deletes(self, context):
"""Retry any pending instance file deletes."""
LOG.debug('Cleaning up deleted instances')
filters = {'deleted': True,
'soft_deleted': False,
'host': CONF.host,
'cleaned': False}
attrs = ['info_cache', 'security_groups', 'system_metadata']
with utils.temporary_mutation(context, read_deleted='yes'):
instances = objects.InstanceList.get_by_filters(
context, filters, expected_attrs=attrs, use_slave=True)
LOG.debug('There are %d instances to clean', len(instances))
for instance in instances:
attempts = int(instance.system_metadata.get('clean_attempts', '0'))
LOG.debug('Instance has had %(attempts)s of %(max)s '
'cleanup attempts',
{'attempts': attempts,
'max': CONF.maximum_instance_delete_attempts},
instance=instance)
if attempts < CONF.maximum_instance_delete_attempts:
success = self.driver.delete_instance_files(instance)
instance.system_metadata['clean_attempts'] = str(attempts + 1)
if success:
instance.cleaned = True
with utils.temporary_mutation(context, read_deleted='yes'):
instance.save()
@periodic_task.periodic_task(spacing=CONF.instance_delete_interval)
def _cleanup_incomplete_migrations(self, context):
"""Delete instance files on failed resize/revert-resize operation
During resize/revert-resize operation, if that instance gets deleted
in-between then instance files might remain either on source or
destination compute node because of race condition.
"""
LOG.debug('Cleaning up deleted instances with incomplete migration ')
migration_filters = {'host': CONF.host,
'status': 'error'}
migrations = objects.MigrationList.get_by_filters(context,
migration_filters)
if not migrations:
return
inst_uuid_from_migrations = set([migration.instance_uuid for migration
in migrations])
inst_filters = {'deleted': True, 'soft_deleted': False,
'uuid': inst_uuid_from_migrations, 'host': CONF.host}
attrs = ['info_cache', 'security_groups', 'system_metadata']
with utils.temporary_mutation(context, read_deleted='yes'):
instances = objects.InstanceList.get_by_filters(
context, inst_filters, expected_attrs=attrs, use_slave=True)
for instance in instances:
for migration in migrations:
if instance.uuid == migration.instance_uuid:
# Delete instance files if not cleanup properly either
# from the source or destination compute nodes when
# the instance is deleted during resizing.
self.driver.delete_instance_files(instance)
try:
migration.status = 'failed'
with migration.obj_as_admin():
migration.save()
except exception.MigrationNotFound:
LOG.warning(_LW("Migration %s is not found."),
migration.id, context=context,
instance=instance)
break
@messaging.expected_exceptions(exception.InstanceQuiesceNotSupported,
exception.QemuGuestAgentNotEnabled,
exception.NovaException,
NotImplementedError)
@wrap_exception()
def quiesce_instance(self, context, instance):
"""Quiesce an instance on this host."""
context = context.elevated()
image_meta = objects.ImageMeta.from_instance(instance)
self.driver.quiesce(context, instance, image_meta)
def _wait_for_snapshots_completion(self, context, mapping):
for mapping_dict in mapping:
if mapping_dict.get('source_type') == 'snapshot':
def _wait_snapshot():
snapshot = self.volume_api.get_snapshot(
context, mapping_dict['snapshot_id'])
if snapshot.get('status') != 'creating':
raise loopingcall.LoopingCallDone()
timer = loopingcall.FixedIntervalLoopingCall(_wait_snapshot)
timer.start(interval=0.5).wait()
@messaging.expected_exceptions(exception.InstanceQuiesceNotSupported,
exception.QemuGuestAgentNotEnabled,
exception.NovaException,
NotImplementedError)
@wrap_exception()
def unquiesce_instance(self, context, instance, mapping=None):
"""Unquiesce an instance on this host.
If snapshots' image mapping is provided, it waits until snapshots are
completed before unqueiscing.
"""
context = context.elevated()
if mapping:
try:
self._wait_for_snapshots_completion(context, mapping)
except Exception as error:
LOG.exception(_LE("Exception while waiting completion of "
"volume snapshots: %s"),
error, instance=instance)
image_meta = objects.ImageMeta.from_instance(instance)
self.driver.unquiesce(context, instance, image_meta)
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