openstack/nova
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Merged with r562

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This commit is contained in:
Hisaharu Ishii 2011-01-14 11:40:50 +09:00
commit f5f0819e1c
5 changed files with 295 additions and 254 deletions
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5
contrib/nova.sh
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@ -83,9 +83,10 @@ if [ "$CMD" == "install" ]; then
sudo /etc/init.d/iscsitarget restart
sudo modprobe kvm
sudo /etc/init.d/libvirt-bin restart
sudo modprobe nbd
sudo apt-get install -y python-twisted python-sqlalchemy python-mox python-greenlet python-carrot
sudo apt-get install -y python-daemon python-eventlet python-gflags python-tornado python-ipy
sudo apt-get install -y python-libvirt python-libxml2 python-routes
sudo apt-get install -y python-daemon python-eventlet python-gflags python-ipy
sudo apt-get install -y python-libvirt python-libxml2 python-routes python-cheetah
#For IPV6
sudo apt-get install -y python-netaddr
sudo apt-get install -y radvd

205
nova/compute/disk.py
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@ -1,205 +0,0 @@
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.
"""
Utility methods to resize, repartition, and modify disk images.
Includes injection of SSH PGP keys into authorized_keys file.
"""
import os
import tempfile
from nova import exception
from nova import flags
from nova import log as logging
LOG = logging.getLogger('nova.compute.disk')
FLAGS = flags.FLAGS
flags.DEFINE_integer('minimum_root_size', 1024 * 1024 * 1024 * 10,
'minimum size in bytes of root partition')
flags.DEFINE_integer('block_size', 1024 * 1024 * 256,
'block_size to use for dd')
def partition(infile, outfile, local_bytes=0, resize=True,
local_type='ext2', execute=None):
"""
Turns a partition (infile) into a bootable drive image (outfile).
The first 63 sectors (0-62) of the resulting image is a master boot record.
Infile becomes the first primary partition.
If local bytes is specified, a second primary partition is created and
formatted as ext2.
::
In the diagram below, dashes represent drive sectors.
+-----+------. . .-------+------. . .------+
| 0 a| b c|d e|
+-----+------. . .-------+------. . .------+
| mbr | primary partiton | local partition |
+-----+------. . .-------+------. . .------+
"""
sector_size = 512
file_size = os.path.getsize(infile)
if resize and file_size < FLAGS.minimum_root_size:
last_sector = FLAGS.minimum_root_size / sector_size - 1
execute('dd if=/dev/zero of=%s count=1 seek=%d bs=%d'
% (infile, last_sector, sector_size))
execute('e2fsck -fp %s' % infile, check_exit_code=False)
execute('resize2fs %s' % infile)
file_size = FLAGS.minimum_root_size
elif file_size % sector_size != 0:
LOG.warn(_("Input partition size not evenly divisible by"
" sector size: %d / %d"), file_size, sector_size)
primary_sectors = file_size / sector_size
if local_bytes % sector_size != 0:
LOG.warn(_("Bytes for local storage not evenly divisible"
" by sector size: %d / %d"), local_bytes, sector_size)
local_sectors = local_bytes / sector_size
mbr_last = 62 # a
primary_first = mbr_last + 1 # b
primary_last = primary_first + primary_sectors - 1 # c
local_first = primary_last + 1 # d
local_last = local_first + local_sectors - 1 # e
last_sector = local_last # e
# create an empty file
execute('dd if=/dev/zero of=%s count=1 seek=%d bs=%d'
% (outfile, mbr_last, sector_size))
# make mbr partition
execute('parted --script %s mklabel msdos' % outfile)
# append primary file
execute('dd if=%s of=%s bs=%s conv=notrunc,fsync oflag=append'
% (infile, outfile, FLAGS.block_size))
# make primary partition
execute('parted --script %s mkpart primary %ds %ds'
% (outfile, primary_first, primary_last))
if local_bytes > 0:
# make the file bigger
execute('dd if=/dev/zero of=%s count=1 seek=%d bs=%d'
% (outfile, last_sector, sector_size))
# make and format local partition
execute('parted --script %s mkpartfs primary %s %ds %ds'
% (outfile, local_type, local_first, local_last))
def extend(image, size, execute):
file_size = os.path.getsize(image)
if file_size >= size:
return
return execute('truncate -s size %s' % (image,))
def inject_data(image, key=None, net=None, partition=None, execute=None):
"""Injects a ssh key and optionally net data into a disk image.
it will mount the image as a fully partitioned disk and attempt to inject
into the specified partition number.
If partition is not specified it mounts the image as a single partition.
"""
out, err = execute('sudo losetup --find --show %s' % image)
if err:
raise exception.Error(_('Could not attach image to loopback: %s')
% err)
device = out.strip()
try:
if not partition is None:
# create partition
out, err = execute('sudo kpartx -a %s' % device)
if err:
raise exception.Error(_('Failed to load partition: %s') % err)
mapped_device = '/dev/mapper/%sp%s' % (device.split('/')[-1],
partition)
else:
mapped_device = device
# We can only loopback mount raw images. If the device isn't there,
# it's normally because it's a .vmdk or a .vdi etc
if not os.path.exists(mapped_device):
raise exception.Error('Mapped device was not found (we can'
' only inject raw disk images): %s' %
mapped_device)
# Configure ext2fs so that it doesn't auto-check every N boots
out, err = execute('sudo tune2fs -c 0 -i 0 %s' % mapped_device)
tmpdir = tempfile.mkdtemp()
try:
# mount loopback to dir
out, err = execute(
'sudo mount %s %s' % (mapped_device, tmpdir))
if err:
raise exception.Error(_('Failed to mount filesystem: %s')
% err)
try:
if key:
# inject key file
_inject_key_into_fs(key, tmpdir, execute=execute)
if net:
_inject_net_into_fs(net, tmpdir, execute=execute)
finally:
# unmount device
execute('sudo umount %s' % mapped_device)
finally:
# remove temporary directory
execute('rmdir %s' % tmpdir)
if not partition is None:
# remove partitions
execute('sudo kpartx -d %s' % device)
finally:
# remove loopback
execute('sudo losetup --detach %s' % device)
def _inject_key_into_fs(key, fs, execute=None):
"""Add the given public ssh key to root's authorized_keys.
key is an ssh key string.
fs is the path to the base of the filesystem into which to inject the key.
"""
sshdir = os.path.join(fs, 'root', '.ssh')
execute('sudo mkdir -p %s' % sshdir) # existing dir doesn't matter
execute('sudo chown root %s' % sshdir)
execute('sudo chmod 700 %s' % sshdir)
keyfile = os.path.join(sshdir, 'authorized_keys')
execute('sudo tee -a %s' % keyfile, '\n' + key.strip() + '\n')
def _inject_net_into_fs(net, fs, execute=None):
"""Inject /etc/network/interfaces into the filesystem rooted at fs.
net is the contents of /etc/network/interfaces.
"""
netdir = os.path.join(os.path.join(fs, 'etc'), 'network')
execute('sudo mkdir -p %s' % netdir) # existing dir doesn't matter
execute('sudo chown root:root %s' % netdir)
execute('sudo chmod 755 %s' % netdir)
netfile = os.path.join(netdir, 'interfaces')
execute('sudo tee %s' % netfile, net)

186
nova/virt/disk.py Normal file
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@ -0,0 +1,186 @@
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.
"""
Utility methods to resize, repartition, and modify disk images.
Includes injection of SSH PGP keys into authorized_keys file.
"""
import os
import tempfile
import time
from nova import exception
from nova import flags
from nova import log as logging
from nova import utils
LOG = logging.getLogger('nova.compute.disk')
FLAGS = flags.FLAGS
flags.DEFINE_integer('minimum_root_size', 1024 * 1024 * 1024 * 10,
'minimum size in bytes of root partition')
flags.DEFINE_integer('block_size', 1024 * 1024 * 256,
'block_size to use for dd')
def extend(image, size):
"""Increase image to size"""
file_size = os.path.getsize(image)
if file_size >= size:
return
utils.execute('truncate -s %s %s' % (size, image))
# NOTE(vish): attempts to resize filesystem
utils.execute('e2fsck -fp %s' % image, check_exit_code=False)
utils.execute('resize2fs %s' % image, check_exit_code=False)
def inject_data(image, key=None, net=None, partition=None, nbd=False):
"""Injects a ssh key and optionally net data into a disk image.
it will mount the image as a fully partitioned disk and attempt to inject
into the specified partition number.
If partition is not specified it mounts the image as a single partition.
"""
device = _link_device(image, nbd)
try:
if not partition is None:
# create partition
out, err = utils.execute('sudo kpartx -a %s' % device)
if err:
raise exception.Error(_('Failed to load partition: %s') % err)
mapped_device = '/dev/mapper/%sp%s' % (device.split('/')[-1],
partition)
else:
mapped_device = device
# We can only loopback mount raw images. If the device isn't there,
# it's normally because it's a .vmdk or a .vdi etc
if not os.path.exists(mapped_device):
raise exception.Error('Mapped device was not found (we can'
' only inject raw disk images): %s' %
mapped_device)
# Configure ext2fs so that it doesn't auto-check every N boots
out, err = utils.execute('sudo tune2fs -c 0 -i 0 %s' % mapped_device)
tmpdir = tempfile.mkdtemp()
try:
# mount loopback to dir
out, err = utils.execute(
'sudo mount %s %s' % (mapped_device, tmpdir))
if err:
raise exception.Error(_('Failed to mount filesystem: %s')
% err)
try:
if key:
# inject key file
_inject_key_into_fs(key, tmpdir)
if net:
_inject_net_into_fs(net, tmpdir)
finally:
# unmount device
utils.execute('sudo umount %s' % mapped_device)
finally:
# remove temporary directory
utils.execute('rmdir %s' % tmpdir)
if not partition is None:
# remove partitions
utils.execute('sudo kpartx -d %s' % device)
finally:
_unlink_device(device, nbd)
def _link_device(image, nbd):
"""Link image to device using loopback or nbd"""
if nbd:
device = _allocate_device()
utils.execute('sudo qemu-nbd -c %s %s' % (device, image))
# NOTE(vish): this forks into another process, so give it a chance
# to set up before continuuing
for i in xrange(10):
if os.path.exists("/sys/block/%s/pid" % os.path.basename(device)):
return device
time.sleep(1)
raise exception.Error(_('nbd device %s did not show up') % device)
else:
out, err = utils.execute('sudo losetup --find --show %s' % image)
if err:
raise exception.Error(_('Could not attach image to loopback: %s')
% err)
return out.strip()
def _unlink_device(device, nbd):
"""Unlink image from device using loopback or nbd"""
if nbd:
utils.execute('sudo qemu-nbd -d %s' % device)
_free_device(device)
else:
utils.execute('sudo losetup --detach %s' % device)
_DEVICES = ['/dev/nbd%s' % i for i in xrange(16)]
def _allocate_device():
# NOTE(vish): This assumes no other processes are allocating nbd devices.
# It may race cause a race condition if multiple
# workers are running on a given machine.
while True:
if not _DEVICES:
raise exception.Error(_('No free nbd devices'))
device = _DEVICES.pop()
if not os.path.exists("/sys/block/%s/pid" % os.path.basename(device)):
break
return device
def _free_device(device):
_DEVICES.append(device)
def _inject_key_into_fs(key, fs):
"""Add the given public ssh key to root's authorized_keys.
key is an ssh key string.
fs is the path to the base of the filesystem into which to inject the key.
"""
sshdir = os.path.join(fs, 'root', '.ssh')
utils.execute('sudo mkdir -p %s' % sshdir) # existing dir doesn't matter
utils.execute('sudo chown root %s' % sshdir)
utils.execute('sudo chmod 700 %s' % sshdir)
keyfile = os.path.join(sshdir, 'authorized_keys')
utils.execute('sudo tee -a %s' % keyfile, '\n' + key.strip() + '\n')
def _inject_net_into_fs(net, fs):
"""Inject /etc/network/interfaces into the filesystem rooted at fs.
net is the contents of /etc/network/interfaces.
"""
netdir = os.path.join(os.path.join(fs, 'etc'), 'network')
utils.execute('sudo mkdir -p %s' % netdir) # existing dir doesn't matter
utils.execute('sudo chown root:root %s' % netdir)
utils.execute('sudo chmod 755 %s' % netdir)
netfile = os.path.join(netdir, 'interfaces')
utils.execute('sudo tee %s' % netfile, net)

16
nova/virt/libvirt.xml.template
View File

@ -7,13 +7,13 @@
#set $disk_bus = 'uml'
<type>uml</type>
<kernel>/usr/bin/linux</kernel>
<root>/dev/ubda1</root>
<root>/dev/ubda</root>
#else
#if $type == 'xen'
#set $disk_prefix = 'sd'
#set $disk_bus = 'scsi'
<type>linux</type>
<root>/dev/xvda1</root>
<root>/dev/xvda</root>
#else
#set $disk_prefix = 'vd'
#set $disk_bus = 'virtio'
@ -28,7 +28,7 @@
#if $type == 'xen'
<cmdline>ro</cmdline>
#else
<cmdline>root=/dev/vda1 console=ttyS0</cmdline>
<cmdline>root=/dev/vda console=ttyS0</cmdline>
#end if
#if $getVar('ramdisk', None)
<initrd>${ramdisk}</initrd>
@ -46,18 +46,28 @@
<devices>
#if $getVar('rescue', False)
<disk type='file'>
<driver type='${driver_type}'/>
<source file='${basepath}/rescue-disk'/>
<target dev='${disk_prefix}a' bus='${disk_bus}'/>
</disk>
<disk type='file'>
<driver type='${driver_type}'/>
<source file='${basepath}/disk'/>
<target dev='${disk_prefix}b' bus='${disk_bus}'/>
</disk>
#else
<disk type='file'>
<driver type='${driver_type}'/>
<source file='${basepath}/disk'/>
<target dev='${disk_prefix}a' bus='${disk_bus}'/>
</disk>
#if $getVar('local', False)
<disk type='file'>
<driver type='${driver_type}'/>
<source file='${basepath}/local'/>
<target dev='${disk_prefix}b' bus='${disk_bus}'/>
</disk>
#end if
#end if
<interface type='bridge'>
<source bridge='${bridge_name}'/>

137
nova/virt/libvirt_conn.py
View File

@ -58,9 +58,9 @@ from nova import log as logging
from nova import utils
#from nova.api import context
from nova.auth import manager
from nova.compute import disk
from nova.compute import instance_types
from nova.compute import power_state
from nova.virt import disk
from nova.virt import images
libvirt = None
@ -91,6 +91,9 @@ flags.DEFINE_string('libvirt_uri',
flags.DEFINE_bool('allow_project_net_traffic',
True,
'Whether to allow in project network traffic')
flags.DEFINE_bool('use_cow_images',
True,
'Whether to use cow images')
flags.DEFINE_string('ajaxterm_portrange',
'10000-12000',
'Range of ports that ajaxterm should randomly try to bind')
@ -489,19 +492,57 @@ class LibvirtConnection(object):
subprocess.Popen(cmd, shell=True)
return {'token': token, 'host': host, 'port': port}
def _cache_image(self, fn, target, fname, cow=False, *args, **kwargs):
"""Wrapper for a method that creates an image that caches the image.
This wrapper will save the image into a common store and create a
copy for use by the hypervisor.
The underlying method should specify a kwarg of target representing
where the image will be saved.
fname is used as the filename of the base image. The filename needs
to be unique to a given image.
If cow is True, it will make a CoW image instead of a copy.
"""
if not os.path.exists(target):
base_dir = os.path.join(FLAGS.instances_path, '_base')
if not os.path.exists(base_dir):
os.mkdir(base_dir)
os.chmod(base_dir, 0777)
base = os.path.join(base_dir, fname)
if not os.path.exists(base):
fn(target=base, *args, **kwargs)
if cow:
utils.execute('qemu-img create -f qcow2 -o '
'cluster_size=2M,backing_file=%s %s'
% (base, target))
else:
utils.execute('cp %s %s' % (base, target))
def _fetch_image(self, target, image_id, user, project, size=None):
"""Grab image and optionally attempt to resize it"""
images.fetch(image_id, target, user, project)
if size:
disk.extend(target, size)
def _create_local(self, target, local_gb):
"""Create a blank image of specified size"""
utils.execute('truncate %s -s %dG' % (target, local_gb))
# TODO(vish): should we format disk by default?
def _create_image(self, inst, libvirt_xml, prefix='', disk_images=None):
# syntactic nicety
basepath = lambda fname = '', prefix = prefix: os.path.join(
FLAGS.instances_path,
inst['name'],
prefix + fname)
def basepath(fname='', prefix=prefix):
return os.path.join(FLAGS.instances_path,
inst['name'],
prefix + fname)
# ensure directories exist and are writable
utils.execute('mkdir -p %s' % basepath(prefix=''))
utils.execute('chmod 0777 %s' % basepath(prefix=''))
# TODO(termie): these are blocking calls, it would be great
# if they weren't.
LOG.info(_('instance %s: Creating image'), inst['name'])
f = open(basepath('libvirt.xml'), 'w')
f.write(libvirt_xml)
@ -518,23 +559,44 @@ class LibvirtConnection(object):
disk_images = {'image_id': inst['image_id'],
'kernel_id': inst['kernel_id'],
'ramdisk_id': inst['ramdisk_id']}
if not os.path.exists(basepath('disk')):
images.fetch(inst.image_id, basepath('disk-raw'), user,
project)
if inst['kernel_id']:
if not os.path.exists(basepath('kernel')):
images.fetch(inst['kernel_id'], basepath('kernel'),
user, project)
if inst['ramdisk_id']:
if not os.path.exists(basepath('ramdisk')):
images.fetch(inst['ramdisk_id'], basepath('ramdisk'),
user, project)
if disk_images['kernel_id']:
self._cache_image(fn=self._fetch_image,
target=basepath('kernel'),
fname=disk_images['kernel_id'],
image_id=disk_images['kernel_id'],
user=user,
project=project)
if disk_images['ramdisk_id']:
self._cache_image(fn=self._fetch_image,
target=basepath('ramdisk'),
fname=disk_images['ramdisk_id'],
image_id=disk_images['ramdisk_id'],
user=user,
project=project)
def execute(cmd, process_input=None, check_exit_code=True):
return utils.execute(cmd=cmd,
process_input=process_input,
check_exit_code=check_exit_code)
root_fname = disk_images['image_id']
size = FLAGS.minimum_root_size
if inst['instance_type'] == 'm1.tiny' or prefix == 'rescue-':
size = None
root_fname += "_sm"
self._cache_image(fn=self._fetch_image,
target=basepath('disk'),
fname=root_fname,
cow=FLAGS.use_cow_images,
image_id=disk_images['image_id'],
user=user,
project=project,
size=size)
type_data = instance_types.INSTANCE_TYPES[inst['instance_type']]
if type_data['local_gb']:
self._cache_image(fn=self._create_local,
target=basepath('local'),
fname="local_%s" % type_data['local_gb'],
cow=FLAGS.use_cow_images,
local_gb=type_data['local_gb'])
# For now, we assume that if we're not using a kernel, we're using a
# partitioned disk image where the target partition is the first
@ -568,34 +630,15 @@ class LibvirtConnection(object):
LOG.info(_('instance %s: injecting net into image %s'),
inst['name'], inst.image_id)
try:
disk.inject_data(basepath('disk-raw'), key, net,
disk.inject_data(basepath('disk'), key, net,
partition=target_partition,
execute=execute)
nbd=FLAGS.use_cow_images)
except Exception as e:
# This could be a windows image, or a vmdk format disk
LOG.warn(_('instance %s: ignoring error injecting data'
' into image %s (%s)'),
inst['name'], inst.image_id, e)
if inst['kernel_id']:
if os.path.exists(basepath('disk')):
utils.execute('rm -f %s' % basepath('disk'))
local_bytes = (instance_types.INSTANCE_TYPES[inst.instance_type]
['local_gb']
* 1024 * 1024 * 1024)
resize = True
if inst['instance_type'] == 'm1.tiny' or prefix == 'rescue-':
resize = False
if inst['kernel_id']:
disk.partition(basepath('disk-raw'), basepath('disk'),
local_bytes, resize, execute=execute)
else:
os.rename(basepath('disk-raw'), basepath('disk'))
disk.extend(basepath('disk'), local_bytes, execute=execute)
if FLAGS.libvirt_type == 'uml':
utils.execute('sudo chown root %s' % basepath('disk'))
@ -640,6 +683,10 @@ class LibvirtConnection(object):
(net, mask)
else:
extra_params = "\n"
if FLAGS.use_cow_images:
driver_type = 'qcow2'
else:
driver_type = 'raw'
xml_info = {'type': FLAGS.libvirt_type,
'name': instance['name'],
@ -653,7 +700,9 @@ class LibvirtConnection(object):
'dhcp_server': dhcp_server,
'ra_server': ra_server,
'extra_params': extra_params,
'rescue': rescue}
'rescue': rescue,
'local': instance_type['local_gb'],
'driver_type': driver_type}
if not rescue:
if instance['kernel_id']:
xml_info['kernel'] = xml_info['basepath'] + "/kernel"