A connection to a hypervisor through libvirt.
Supports KVM, LXC, QEMU, UML, and XEN.
Related Flags
libvirt_type: | Libvirt domain type. Can be kvm, qemu, uml, xen (default: kvm). |
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libvirt_uri: | Override for the default libvirt URI (depends on libvirt_type). |
libvirt_disk_prefix: | |
Override the default disk prefix for the devices attached to a server. | |
rescue_image_id: | |
Rescue ami image (None = original image). | |
rescue_kernel_id: | |
Rescue aki image (None = original image). | |
rescue_ramdisk_id: | |
Rescue ari image (None = original image). | |
injected_network_template: | |
Template file for injected network | |
allow_same_net_traffic: | |
Whether to allow in project network traffic |
Bases: object
Manages information about the compute node through libvirt
Return the current state of the host.
If ‘refresh’ is True, run update the stats first.
Retrieve status info from libvirt.
Bases: nova.virt.driver.ComputeDriver
Note that this function takes an instance name.
Checks the host cpu is compatible to a cpu given by xml.
“xml” must be a part of libvirt.openReadonly().getCapabilities(). return values follows by virCPUCompareResult. if 0 > return value, do live migration. ‘http://libvirt.org/html/libvirt-libvirt.html#virCPUCompareResult‘
Parameters: | cpu_info – json string that shows cpu feature(see get_cpu_info()) |
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Returns: | None. if given cpu info is not compatible to this server, raise exception. |
Confirms a resize, destroying the source VM
Setting up filtering rules and waiting for its completion.
To migrate an instance, filtering rules to hypervisors and firewalls are inevitable on destination host. ( Waiting only for filterling rules to hypervisor, since filtering rules to firewall rules can be set faster).
Concretely, the below method must be called. - setup_basic_filtering (for nova-basic, etc.) - prepare_instance_filter(for nova-instance-instance-xxx, etc.)
to_xml may have to be called since it defines PROJNET, PROJMASK. but libvirt migrates those value through migrateToURI(), so , no need to be called.
Don’t use thread for this method since migration should not be started when setting-up filtering rules operations are not completed.
Params instance_ref: | |
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nova.db.sqlalchemy.models.Instance object |
Return all block devices in use on this node.
Get cpuinfo information.
Obtains cpu feature from virConnect.getCapabilities, and returns as a json string.
Returns: | see above description |
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Return disk available least size.
The size of available disk, when block_migration command given disk_over_commit param is FALSE.
The size that deducted real nstance disk size from the total size of the virtual disk of all instances.
Note that this function takes an instance name.
Returns a list of all block devices for this domain.
Return the current state of the host.
If ‘refresh’ is True, run update the stats first.
Returns the hostname of the hypervisor.
Get hypervisor type.
Returns: | hypervisor type (ex. qemu) |
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Get hypervisor version.
Returns: | hypervisor version (ex. 12003) |
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Retrieve information from libvirt for a specific instance name.
If a libvirt error is encountered during lookup, we might raise a NotFound exception or Error exception depending on how severe the libvirt error is.
Preparation block migration.
Params ctxt: | security context |
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Params instance_ref: | |
nova.db.sqlalchemy.models.Instance object instance object that is migrated. | |
Returns: | json strings with below format:"[{'path':'disk', 'type':'raw',
'virt_disk_size':'10737418240',
'backing_file':'backing_file',
'disk_size':'83886080'},...]"
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Note that this function takes an instance name.
Returns a list of all network interfaces for this instance.
Get the total hdd size(GB) of physical computer.
Returns: | The total amount of HDD(GB). Note that this value shows a partition where NOVA-INST-DIR/instances mounts. |
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Get the free hdd size(GB) of physical computer.
Returns: | The total usage of HDD(GB). Note that this value shows a partition where NOVA-INST-DIR/instances mounts. |
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Get the total memory size(MB) of physical computer.
Returns: | the total amount of memory(MB). |
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Get the free memory size(MB) of physical computer.
Returns: | the total usage of memory(MB). |
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Efficient override of base instance_exists method.
Get vcpu number of physical computer.
Returns: | the number of cpu core. |
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Get vcpu usage number of physical computer.
Returns: | The total number of vcpu that currently used. |
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Start/Stop host maintenance window. On start, it triggers guest VMs evacuation.
Reboots, shuts down or powers up the host.
Efficient override of base instance_exists method.
Note that this function takes an instance name.
Spawning live_migration operation for distributing high-load.
Params ctxt: | security context |
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Params instance_ref: | |
nova.db.sqlalchemy.models.Instance object instance object that is migrated. | |
Params dest: | destination host |
Params block_migration: | |
destination host | |
Params post_method: | |
post operation method. expected nova.compute.manager.post_live_migration. | |
Params recover_method: | |
recovery method when any exception occurs. expected nova.compute.manager.recover_live_migration. | |
Params block_migration: | |
if true, do block migration. |
Manage the local cache of images.
Pause VM instance
Plug VIFs into networks.
Post operation of live migration at destination host.
Parameters: |
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Preparation block migration.
Params ctxt: | security context |
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Params instance_ref: | |
nova.db.sqlalchemy.models.Instance object instance object that is migrated. | |
Params disk_info_json: | |
json strings specified in get_instance_disk_info |
Preparation live migration.
Params block_device_info: | |
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It must be the result of _get_instance_volume_bdms() at compute manager. |
Reboot a virtual machine, given an instance reference.
Loads a VM using rescue images.
A rescue is normally performed when something goes wrong with the primary images and data needs to be corrected/recovered. Rescuing should not edit or over-ride the original image, only allow for data recovery.
resume the specified instance
Sets the specified host’s ability to accept new instances.
Create snapshot from a running VM instance.
This command only works with qemu 0.14+
Suspend the specified instance
See comments of same method in firewall_driver.
Unpause paused VM instance
Unplug VIFs from networks.
Reboot the VM which is being rescued back into primary images.
Because reboot destroys and re-creates instances, unresue should simply call reboot.
Updates compute manager resource info on ComputeNode table.
This method is called as a periodic task and is used only in live migration currently.
Parameters: |
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Retrieve status info from libvirt.
Query libvirt to get the state of the compute node, such as memory and disk usage.
eventlet.tpool.Proxy doesn’t work with old-style class in __str__() or __repr__() calls. See bug #962840 for details. We perform a monkey patch to replace those two instance methods.