openstack-manuals/doc/config-reference/source/tables/nova-libvirt.rst

Description of Libvirt configuration options

Configuration option = Default value	Description
[DEFAULT]
remove_unused_base_images = True	(Boolean) Should unused base images be removed?
remove_unused_original_minimum_age_seconds = 86400	(Integer) Unused unresized base images younger than this will not be removed
[libvirt]
block_migration_flag = VIR_MIGRATE_UNDEFINE_SOURCE, VIR_MIGRATE_PEER2PEER, VIR_MIGRATE_LIVE, VIR_MIGRATE_TUNNELLED, VIR_MIGRATE_NON_SHARED_INC	(String) DEPRECATED: Migration flags to be set for block migration The correct block migration flags can be inferred from the new live_migration_tunnelled config option. block_migration_flag will be removed to avoid potential misconfiguration.
checksum_base_images = False	(Boolean) Write a checksum for files in _base to disk
checksum_interval_seconds = 3600	(Integer) How frequently to checksum base images
connection_uri =	(String) Override the default libvirt URI (which is dependent on virt_type)
cpu_mode = None	(String) Set to "host-model" to clone the host CPU feature flags; to "host-passthrough" to use the host CPU model exactly; to "custom" to use a named CPU model; to "none" to not set any CPU model. If virt_type="kvm|qemu", it will default to "host-model", otherwise it will default to "none"
cpu_model = None	(String) Set to a named libvirt CPU model (see names listed in /usr/share/libvirt/cpu_map.xml). Only has effect if cpu_mode="custom" and virt_type="kvm|qemu"
disk_cachemodes =	(List) Specific cachemodes to use for different disk types e.g: file=directsync,block=none
disk_prefix = None	(String) Override the default disk prefix for the devices attached to a server, which is dependent on virt_type. (valid options are: sd, xvd, uvd, vd)
gid_maps =	(List) List of guid targets and ranges.Syntax is guest-gid:host-gid:countMaximum of 5 allowed.
hw_disk_discard = None	(String) Discard option for nova managed disks. Need Libvirt(1.0.6) Qemu1.5 (raw format) Qemu1.6(qcow2 format)
hw_machine_type = None	(List) For qemu or KVM guests, set this option to specify a default machine type per host architecture. You can find a list of supported machine types in your environment by checking the output of the "virsh capabilities"command. The format of the value for this config option is host-arch=machine-type. For example: x86_64=machinetype1,armv7l=machinetype2
image_info_filename_pattern = $instances_path/$image_cache_subdirectory_name/%(image)s.info	(String) Allows image information files to be stored in non-standard locations
images_rbd_ceph_conf =	(String) Path to the ceph configuration file to use
images_rbd_pool = rbd	(String) The RADOS pool in which rbd volumes are stored
images_type = default	(String) VM Images format. If default is specified, then use_cow_images flag is used instead of this one.
images_volume_group = None	(String) LVM Volume Group that is used for VM images, when you specify images_type=lvm.
inject_key = False	(Boolean) Inject the ssh public key at boot time
inject_partition = -2	(Integer) The partition to inject to : -2 => disable, -1 => inspect (libguestfs only), 0 => not partitioned, >0 => partition number
inject_password = False	(Boolean) Inject the admin password at boot time, without an agent.
iscsi_iface = None	(String) The iSCSI transport iface to use to connect to target in case offload support is desired. Default format is of the form <transport_name>.<hwaddress> where <transport_name> is one of (be2iscsi, bnx2i, cxgb3i, cxgb4i, qla4xxx, ocs) and <hwaddress> is the MAC address of the interface and can be generated via the iscsiadm -m iface command. Do not confuse the iscsi_iface parameter to be provided here with the actual transport name.
iscsi_use_multipath = False	(Boolean) Use multipath connection of the iSCSI or FC volume
iser_use_multipath = False	(Boolean) Use multipath connection of the iSER volume
mem_stats_period_seconds = 10	(Integer) A number of seconds to memory usage statistics period. Zero or negative value mean to disable memory usage statistics.
realtime_scheduler_priority = 1	(Integer) In a realtime host context vCPUs for guest will run in that scheduling priority. Priority depends on the host kernel (usually 1-99)
remove_unused_kernels = True	(Boolean) DEPRECATED: Should unused kernel images be removed? This is only safe to enable if all compute nodes have been updated to support this option (running Grizzly or newer level compute). This will be the default behavior in the 13.0.0 release.
remove_unused_resized_minimum_age_seconds = 3600	(Integer) Unused resized base images younger than this will not be removed
rescue_image_id = None	(String) Rescue ami image. This will not be used if an image id is provided by the user.
rescue_kernel_id = None	(String) Rescue aki image
rescue_ramdisk_id = None	(String) Rescue ari image
rng_dev_path = None	(String) A path to a device that will be used as source of entropy on the host. Permitted options are: /dev/random or /dev/hwrng
snapshot_compression = False	(Boolean) Compress snapshot images when possible. This currently applies exclusively to qcow2 images
snapshot_image_format = None	(String) Snapshot image format. Defaults to same as source image
snapshots_directory = $instances_path/snapshots	(String) Location where libvirt driver will store snapshots before uploading them to image service
sparse_logical_volumes = False	(Boolean) Create sparse logical volumes (with virtualsize) if this flag is set to True.
sysinfo_serial = auto	(String) The data source used to the populate the host "serial" UUID exposed to guest in the virtual BIOS.
uid_maps =	(List) List of uid targets and ranges.Syntax is guest-uid:host-uid:countMaximum of 5 allowed.
use_usb_tablet = True	(Boolean) Sync virtual and real mouse cursors in Windows VMs
use_virtio_for_bridges = True	(Boolean) Use virtio for bridge interfaces with KVM/QEMU
virt_type = kvm	(String) Libvirt domain type
volume_clear = zero	(String) Method used to wipe old volumes.
volume_clear_size = 0	(Integer) Size in MiB to wipe at start of old volumes. 0 => all
wait_soft_reboot_seconds = 120	(Integer) Number of seconds to wait for instance to shut down after soft reboot request is made. We fall back to hard reboot if instance does not shutdown within this window.