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nova
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nova/nova/virt/libvirt/driver.py

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# 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.
# Copyright (c) 2010 Citrix Systems, Inc.
# Copyright (c) 2011 Piston Cloud Computing, Inc
# Copyright (c) 2012 University Of Minho
#
# 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.
"""
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).
: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
"""
import errno
import functools
import glob
import hashlib
import multiprocessing
import os
import shutil
import sys
import tempfile
import uuid
from eventlet import greenthread
from eventlet import tpool
from lxml import etree
from xml.dom import minidom
from nova.api.metadata import base as instance_metadata
from nova import block_device
from nova.compute import instance_types
from nova.compute import power_state
from nova.compute import vm_mode
from nova import context as nova_context
from nova import db
from nova import exception
from nova import flags
from nova.image import glance
from nova.openstack.common import cfg
from nova.openstack.common import excutils
from nova.openstack.common import importutils
from nova.openstack.common import jsonutils
from nova.openstack.common import log as logging
from nova import utils
from nova.virt import configdrive
from nova.virt.disk import api as disk
from nova.virt import driver
from nova.virt import firewall
from nova.virt.libvirt import config
from nova.virt.libvirt import firewall as libvirt_firewall
from nova.virt.libvirt import imagebackend
from nova.virt.libvirt import imagecache
from nova.virt.libvirt import utils as libvirt_utils
from nova.virt import netutils
libvirt = None
LOG = logging.getLogger(__name__)
libvirt_opts = [
cfg.StrOpt('rescue_image_id',
default=None,
help='Rescue ami image'),
cfg.StrOpt('rescue_kernel_id',
default=None,
help='Rescue aki image'),
cfg.StrOpt('rescue_ramdisk_id',
default=None,
help='Rescue ari image'),
cfg.StrOpt('libvirt_type',
default='kvm',
help='Libvirt domain type (valid options are: '
'kvm, lxc, qemu, uml, xen)'),
cfg.StrOpt('libvirt_uri',
default='',
help='Override the default libvirt URI '
'(which is dependent on libvirt_type)'),
cfg.BoolOpt('libvirt_inject_password',
default=False,
help='Inject the admin password at boot time, '
'without an agent.'),
cfg.BoolOpt('libvirt_inject_key',
default=True,
help='Inject the ssh public key at boot time'),
cfg.IntOpt('libvirt_inject_partition',
default=1,
help='The partition to inject to : '
'-1 => inspect (libguestfs only), 0 => not partitioned, '
'>0 => partition number'),
cfg.BoolOpt('use_usb_tablet',
default=True,
help='Sync virtual and real mouse cursors in Windows VMs'),
cfg.StrOpt('live_migration_uri',
default="qemu+tcp://%s/system",
help='Migration target URI '
'(any included "%s" is replaced with '
'the migration target hostname)'),
cfg.StrOpt('live_migration_flag',
default='VIR_MIGRATE_UNDEFINE_SOURCE, VIR_MIGRATE_PEER2PEER',
help='Migration flags to be set for live migration'),
cfg.StrOpt('block_migration_flag',
default='VIR_MIGRATE_UNDEFINE_SOURCE, VIR_MIGRATE_PEER2PEER, '
'VIR_MIGRATE_NON_SHARED_INC',
help='Migration flags to be set for block migration'),
cfg.IntOpt('live_migration_bandwidth',
default=0,
help='Maximum bandwidth to be used during migration, in Mbps'),
cfg.StrOpt('snapshot_image_format',
default=None,
help='Snapshot image format (valid options are : '
'raw, qcow2, vmdk, vdi). '
'Defaults to same as source image'),
cfg.StrOpt('libvirt_vif_driver',
default='nova.virt.libvirt.vif.LibvirtBridgeDriver',
help='The libvirt VIF driver to configure the VIFs.'),
cfg.ListOpt('libvirt_volume_drivers',
default=[
'iscsi=nova.virt.libvirt.volume.LibvirtISCSIVolumeDriver',
'local=nova.virt.libvirt.volume.LibvirtVolumeDriver',
'fake=nova.virt.libvirt.volume.LibvirtFakeVolumeDriver',
'rbd=nova.virt.libvirt.volume.LibvirtNetVolumeDriver',
'sheepdog=nova.virt.libvirt.volume.LibvirtNetVolumeDriver',
'nfs=nova.virt.libvirt.volume_nfs.NfsVolumeDriver'
],
help='Libvirt handlers for remote volumes.'),
cfg.StrOpt('libvirt_disk_prefix',
default=None,
help='Override the default disk prefix for the devices attached'
' to a server, which is dependent on libvirt_type. '
'(valid options are: sd, xvd, uvd, vd)'),
cfg.IntOpt('libvirt_wait_soft_reboot_seconds',
default=120,
help='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.'),
cfg.BoolOpt('libvirt_nonblocking',
default=True,
help='Use a separated OS thread pool to realize non-blocking'
' libvirt calls'),
# force_config_drive is a string option, to allow for future behaviors
# (e.g. use config_drive based on image properties)
cfg.StrOpt('force_config_drive',
default=None,
help='Set to force injection to take place on a config drive '
'(if set, valid options are: always)'),
cfg.StrOpt('libvirt_cpu_mode',
default=None,
help='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 libvirt_type="kvm|qemu", it will default to '
'"host-model", otherwise it will default to "none"'),
cfg.StrOpt('libvirt_cpu_model',
default=None,
help='Set to a named libvirt CPU model (see names listed '
'in /usr/share/libvirt/cpu_map.xml). Only has effect if '
'libvirt_cpu_mode="custom" and libvirt_type="kvm|qemu"'),
cfg.StrOpt('libvirt_snapshots_directory',
default='$instances_path/snapshots',
help='Location where libvirt driver will store snapshots '
'before uploading them to image service'),
]
FLAGS = flags.FLAGS
FLAGS.register_opts(libvirt_opts)
flags.DECLARE('live_migration_retry_count', 'nova.compute.manager')
flags.DECLARE('vncserver_proxyclient_address', 'nova.vnc')
DEFAULT_FIREWALL_DRIVER = "%s.%s" % (
libvirt_firewall.__name__,
libvirt_firewall.IptablesFirewallDriver.__name__)
MAX_CONSOLE_BYTES = 102400
def patch_tpool_proxy():
"""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.
"""
def str_method(self):
return str(self._obj)
def repr_method(self):
return repr(self._obj)
tpool.Proxy.__str__ = str_method
tpool.Proxy.__repr__ = repr_method
patch_tpool_proxy()
VIR_DOMAIN_NOSTATE = 0
VIR_DOMAIN_RUNNING = 1
VIR_DOMAIN_BLOCKED = 2
VIR_DOMAIN_PAUSED = 3
VIR_DOMAIN_SHUTDOWN = 4
VIR_DOMAIN_SHUTOFF = 5
VIR_DOMAIN_CRASHED = 6
VIR_DOMAIN_PMSUSPENDED = 7
LIBVIRT_POWER_STATE = {
VIR_DOMAIN_NOSTATE: power_state.NOSTATE,
VIR_DOMAIN_RUNNING: power_state.RUNNING,
# NOTE(maoy): The DOMAIN_BLOCKED state is only valid in Xen.
# It means that the VM is running and the vCPU is idle. So,
# we map it to RUNNING
VIR_DOMAIN_BLOCKED: power_state.RUNNING,
VIR_DOMAIN_PAUSED: power_state.PAUSED,
# NOTE(maoy): The libvirt API doc says that DOMAIN_SHUTDOWN
# means the domain is being shut down. So technically the domain
# is still running. SHUTOFF is the real powered off state.
# But we will map both to SHUTDOWN anyway.
# http://libvirt.org/html/libvirt-libvirt.html
VIR_DOMAIN_SHUTDOWN: power_state.SHUTDOWN,
VIR_DOMAIN_SHUTOFF: power_state.SHUTDOWN,
VIR_DOMAIN_CRASHED: power_state.CRASHED,
VIR_DOMAIN_PMSUSPENDED: power_state.SUSPENDED,
}
MIN_LIBVIRT_VERSION = (0, 9, 6)
# When the above version matches/exceeds this version
# delete it & corresponding code using it
MIN_LIBVIRT_HOST_CPU_VERSION = (0, 9, 10)
def _get_eph_disk(ephemeral):
return 'disk.eph' + str(ephemeral['num'])
class LibvirtDriver(driver.ComputeDriver):
def __init__(self, read_only=False):
super(LibvirtDriver, self).__init__()
global libvirt
if libvirt is None:
libvirt = __import__('libvirt')
self._host_state = None
self._initiator = None
self._wrapped_conn = None
self._caps = None
self.read_only = read_only
self.firewall_driver = firewall.load_driver(
default=DEFAULT_FIREWALL_DRIVER,
get_connection=self._get_connection)
self.vif_driver = importutils.import_object(FLAGS.libvirt_vif_driver)
self.volume_drivers = {}
for driver_str in FLAGS.libvirt_volume_drivers:
driver_type, _sep, driver = driver_str.partition('=')
driver_class = importutils.import_class(driver)
self.volume_drivers[driver_type] = driver_class(self)
self._host_state = None
disk_prefix_map = {"lxc": "", "uml": "ubd", "xen": "sd"}
if FLAGS.libvirt_disk_prefix:
self._disk_prefix = FLAGS.libvirt_disk_prefix
else:
self._disk_prefix = disk_prefix_map.get(FLAGS.libvirt_type, 'vd')
self.default_root_device = self._disk_prefix + 'a'
self.default_second_device = self._disk_prefix + 'b'
self.default_third_device = self._disk_prefix + 'c'
self.default_last_device = self._disk_prefix + 'z'
self._disk_cachemode = None
self.image_cache_manager = imagecache.ImageCacheManager()
self.image_backend = imagebackend.Backend(FLAGS.use_cow_images)
@property
def disk_cachemode(self):
if self._disk_cachemode is None:
# We prefer 'none' for consistent performance, host crash
# safety & migration correctness by avoiding host page cache.
# Some filesystems (eg GlusterFS via FUSE) don't support
# O_DIRECT though. For those we fallback to 'writethrough'
# which gives host crash safety, and is safe for migration
# provided the filesystem is cache coherant (cluster filesystems
# typically are, but things like NFS are not).
self._disk_cachemode = "none"
if not self._supports_direct_io(FLAGS.instances_path):
self._disk_cachemode = "writethrough"
return self._disk_cachemode
@property
def host_state(self):
if not self._host_state:
self._host_state = HostState(self.read_only)
return self._host_state
def has_min_version(self, ver):
libvirt_version = self._conn.getLibVersion()
def _munge_version(ver):
return ver[0] * 1000000 + ver[1] * 1000 + ver[2]
if libvirt_version < _munge_version(ver):
return False
return True
def init_host(self, host):
if not self.has_min_version(MIN_LIBVIRT_VERSION):
major = MIN_LIBVIRT_VERSION[0]
minor = MIN_LIBVIRT_VERSION[1]
micro = MIN_LIBVIRT_VERSION[2]
LOG.error(_('Nova requires libvirt version '
'%(major)i.%(minor)i.%(micro)i or greater.') %
locals())
def _get_connection(self):
if not self._wrapped_conn or not self._test_connection():
LOG.debug(_('Connecting to libvirt: %s'), self.uri)
if not FLAGS.libvirt_nonblocking:
self._wrapped_conn = self._connect(self.uri,
self.read_only)
else:
self._wrapped_conn = tpool.proxy_call(
(libvirt.virDomain, libvirt.virConnect),
self._connect, self.uri, self.read_only)
return self._wrapped_conn
_conn = property(_get_connection)
def _test_connection(self):
try:
self._wrapped_conn.getLibVersion()
return True
except libvirt.libvirtError as e:
if (e.get_error_code() == libvirt.VIR_ERR_SYSTEM_ERROR and
e.get_error_domain() in (libvirt.VIR_FROM_REMOTE,
libvirt.VIR_FROM_RPC)):
LOG.debug(_('Connection to libvirt broke'))
return False
raise
@property
def uri(self):
if FLAGS.libvirt_type == 'uml':
uri = FLAGS.libvirt_uri or 'uml:///system'
elif FLAGS.libvirt_type == 'xen':
uri = FLAGS.libvirt_uri or 'xen:///'
elif FLAGS.libvirt_type == 'lxc':
uri = FLAGS.libvirt_uri or 'lxc:///'
else:
uri = FLAGS.libvirt_uri or 'qemu:///system'
return uri
@staticmethod
def _connect(uri, read_only):
def _connect_auth_cb(creds, opaque):
if len(creds) == 0:
return 0
LOG.warning(
_("Can not handle authentication request for %d credentials")
% len(creds))
raise exception.NovaException(
_("Can not handle authentication request for %d credentials")
% len(creds))
auth = [[libvirt.VIR_CRED_AUTHNAME,
libvirt.VIR_CRED_ECHOPROMPT,
libvirt.VIR_CRED_REALM,
libvirt.VIR_CRED_PASSPHRASE,
libvirt.VIR_CRED_NOECHOPROMPT,
libvirt.VIR_CRED_EXTERNAL],
_connect_auth_cb,
None]
if read_only:
return libvirt.openReadOnly(uri)
else:
return libvirt.openAuth(uri, auth, 0)
def get_num_instances(self):
"""Efficient override of base instance_exists method."""
return self._conn.numOfDomains()
def instance_exists(self, instance_id):
"""Efficient override of base instance_exists method."""
try:
self._lookup_by_name(instance_id)
return True
except exception.NovaException:
return False
# TODO(Shrews): Remove when libvirt Bugzilla bug # 836647 is fixed.
def list_instance_ids(self):
if self._conn.numOfDomains() == 0:
return []
return self._conn.listDomainsID()
def list_instances(self):
names = []
for domain_id in self.list_instance_ids():
try:
# We skip domains with ID 0 (hypervisors).
if domain_id != 0:
domain = self._conn.lookupByID(domain_id)
names.append(domain.name())
except libvirt.libvirtError:
# Instance was deleted while listing... ignore it
pass
return names
def plug_vifs(self, instance, network_info):
"""Plug VIFs into networks."""
for (network, mapping) in network_info:
self.vif_driver.plug(instance, (network, mapping))
def unplug_vifs(self, instance, network_info):
"""Unplug VIFs from networks."""
for (network, mapping) in network_info:
self.vif_driver.unplug(instance, (network, mapping))
def _destroy(self, instance):
try:
virt_dom = self._lookup_by_name(instance['name'])
except exception.NotFound:
virt_dom = None
# If the instance is already terminated, we're still happy
# Otherwise, destroy it
if virt_dom is not None:
try:
virt_dom.destroy()
except libvirt.libvirtError as e:
is_okay = False
errcode = e.get_error_code()
if errcode == libvirt.VIR_ERR_OPERATION_INVALID:
# If the instance is already shut off, we get this:
# Code=55 Error=Requested operation is not valid:
# domain is not running
(state, _max_mem, _mem, _cpus, _t) = virt_dom.info()
state = LIBVIRT_POWER_STATE[state]
if state == power_state.SHUTDOWN:
is_okay = True
if not is_okay:
LOG.error(_("Error from libvirt during destroy. "
"Code=%(errcode)s Error=%(e)s") %
locals(), instance=instance)
raise
def _wait_for_destroy():
"""Called at an interval until the VM is gone."""
# NOTE(vish): If the instance disappears during the destroy
# we ignore it so the cleanup can still be
# attempted because we would prefer destroy to
# never fail.
try:
state = self.get_info(instance)['state']
except exception.NotFound:
LOG.error(_("During wait destroy, instance disappeared."),
instance=instance)
raise utils.LoopingCallDone()
if state == power_state.SHUTDOWN:
LOG.info(_("Instance destroyed successfully."),
instance=instance)
raise utils.LoopingCallDone()
timer = utils.LoopingCall(_wait_for_destroy)
timer.start(interval=0.5).wait()
def destroy(self, instance, network_info, block_device_info=None):
self._destroy(instance)
self._cleanup(instance, network_info, block_device_info)
def _undefine_domain(self, instance):
try:
virt_dom = self._lookup_by_name(instance['name'])
except exception.NotFound:
virt_dom = None
if virt_dom:
try:
try:
virt_dom.undefineFlags(
libvirt.VIR_DOMAIN_UNDEFINE_MANAGED_SAVE)
except libvirt.libvirtError:
LOG.debug(_("Error from libvirt during undefineFlags."
" Retrying with undefine"), instance=instance)
virt_dom.undefine()
except AttributeError:
# NOTE(vish): Older versions of libvirt don't support
# undefine flags, so attempt to do the
# right thing.
try:
if virt_dom.hasManagedSaveImage(0):
virt_dom.managedSaveRemove(0)
except AttributeError:
pass
virt_dom.undefine()
except libvirt.libvirtError as e:
errcode = e.get_error_code()
LOG.error(_("Error from libvirt during undefine. "
"Code=%(errcode)s Error=%(e)s") %
locals(), instance=instance)
raise
def _cleanup(self, instance, network_info, block_device_info):
self._undefine_domain(instance)
self.unplug_vifs(instance, network_info)
try:
self.firewall_driver.unfilter_instance(instance,
network_info=network_info)
except libvirt.libvirtError as e:
errcode = e.get_error_code()
LOG.error(_("Error from libvirt during unfilter. "
"Code=%(errcode)s Error=%(e)s") %
locals(), instance=instance)
reason = "Error unfiltering instance."
raise exception.InstanceTerminationFailure(reason=reason)
# NOTE(vish): we disconnect from volumes regardless
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
for vol in block_device_mapping:
connection_info = vol['connection_info']
mount_device = vol['mount_device'].rpartition("/")[2]
self.volume_driver_method('disconnect_volume',
connection_info,
mount_device)
target = os.path.join(FLAGS.instances_path, instance['name'])
LOG.info(_('Deleting instance files %(target)s') % locals(),
instance=instance)
if FLAGS.libvirt_type == 'lxc':
container_dir = os.path.join(FLAGS.instances_path,
instance['name'],
'rootfs')
disk.destroy_container(container_dir=container_dir)
if os.path.exists(target):
# If we fail to get rid of the directory
# tree, this shouldn't block deletion of
# the instance as whole.
try:
shutil.rmtree(target)
except OSError, e:
LOG.error(_("Failed to cleanup directory %(target)s: %(e)s") %
locals())
#NOTE(bfilippov): destroy all LVM disks for this instance
self._cleanup_lvm(instance)
def _cleanup_lvm(self, instance):
"""Delete all LVM disks for given instance object"""
disks = self._lvm_disks(instance)
if disks:
libvirt_utils.remove_logical_volumes(*disks)
def _lvm_disks(self, instance):
"""Returns all LVM disks for given instance object"""
if FLAGS.libvirt_images_volume_group:
vg = os.path.join('/dev', FLAGS.libvirt_images_volume_group)
if not os.path.exists(vg):
return []
pattern = '%s_' % instance['name']
def belongs_to_instance(disk):
return disk.startswith(pattern)
def fullpath(name):
return os.path.join(vg, name)
logical_volumes = libvirt_utils.list_logical_volumes(vg)
disk_names = filter(belongs_to_instance, logical_volumes)
disks = map(fullpath, disk_names)
return disks
return []
def get_volume_connector(self, instance):
if not self._initiator:
self._initiator = libvirt_utils.get_iscsi_initiator()
if not self._initiator:
LOG.warn(_('Could not determine iscsi initiator name'),
instance=instance)
return {
'ip': FLAGS.my_ip,
'initiator': self._initiator,
'host': FLAGS.host
}
def _cleanup_resize(self, instance, network_info):
target = os.path.join(FLAGS.instances_path,
instance['name'] + "_resize")
if os.path.exists(target):
shutil.rmtree(target)
if instance['host'] != FLAGS.host:
self._undefine_domain(instance)
self.unplug_vifs(instance, network_info)
self.firewall_driver.unfilter_instance(instance, network_info)
def volume_driver_method(self, method_name, connection_info,
*args, **kwargs):
driver_type = connection_info.get('driver_volume_type')
if not driver_type in self.volume_drivers:
raise exception.VolumeDriverNotFound(driver_type=driver_type)
driver = self.volume_drivers[driver_type]
method = getattr(driver, method_name)
return method(connection_info, *args, **kwargs)
@exception.wrap_exception()
def attach_volume(self, connection_info, instance_name, mountpoint):
virt_dom = self._lookup_by_name(instance_name)
mount_device = mountpoint.rpartition("/")[2]
conf = self.volume_driver_method('connect_volume',
connection_info,
mount_device)
if FLAGS.libvirt_type == 'lxc':
self._attach_lxc_volume(conf.to_xml(), virt_dom, instance_name)
# TODO(danms) once libvirt has support for LXC hotplug,
# replace this re-define with use of the
# VIR_DOMAIN_AFFECT_LIVE & VIR_DOMAIN_AFFECT_CONFIG flags with
# attachDevice()
domxml = virt_dom.XMLDesc(libvirt.VIR_DOMAIN_XML_SECURE)
self._conn.defineXML(domxml)
else:
try:
# NOTE(vish): We can always affect config because our
# domains are persistent, but we should only
# affect live if the domain is running.
flags = libvirt.VIR_DOMAIN_AFFECT_CONFIG
state = LIBVIRT_POWER_STATE[virt_dom.info()[0]]
if state == power_state.RUNNING:
flags |= libvirt.VIR_DOMAIN_AFFECT_LIVE
virt_dom.attachDeviceFlags(conf.to_xml(), flags)
except Exception, ex:
if isinstance(ex, libvirt.libvirtError):
errcode = ex.get_error_code()
if errcode == libvirt.VIR_ERR_OPERATION_FAILED:
self.volume_driver_method('disconnect_volume',
connection_info,
mount_device)
raise exception.DeviceIsBusy(device=mount_device)
with excutils.save_and_reraise_exception():
self.volume_driver_method('disconnect_volume',
connection_info,
mount_device)
@staticmethod
def _get_disk_xml(xml, device):
"""Returns the xml for the disk mounted at device"""
try:
doc = etree.fromstring(xml)
except Exception:
return None
ret = doc.findall('./devices/disk')
for node in ret:
for child in node.getchildren():
if child.tag == 'target':
if child.get('dev') == device:
return etree.tostring(node)
def _get_domain_xml(self, instance, network_info, block_device_info=None):
try:
virt_dom = self._lookup_by_name(instance['name'])
xml = virt_dom.XMLDesc(0)
except exception.InstanceNotFound:
xml = self.to_xml(instance, network_info,
block_device_info=block_device_info)
return xml
@exception.wrap_exception()
def detach_volume(self, connection_info, instance_name, mountpoint):
mount_device = mountpoint.rpartition("/")[2]
try:
virt_dom = self._lookup_by_name(instance_name)
xml = self._get_disk_xml(virt_dom.XMLDesc(0), mount_device)
if not xml:
raise exception.DiskNotFound(location=mount_device)
if FLAGS.libvirt_type == 'lxc':
self._detach_lxc_volume(xml, virt_dom, instance_name)
# TODO(danms) once libvirt has support for LXC hotplug,
# replace this re-define with use of the
# VIR_DOMAIN_AFFECT_LIVE & VIR_DOMAIN_AFFECT_CONFIG flags with
# detachDevice()
domxml = virt_dom.XMLDesc(libvirt.VIR_DOMAIN_XML_SECURE)
self._conn.defineXML(domxml)
else:
# NOTE(vish): We can always affect config because our
# domains are persistent, but we should only
# affect live if the domain is running.
flags = libvirt.VIR_DOMAIN_AFFECT_CONFIG
state = LIBVIRT_POWER_STATE[virt_dom.info()[0]]
if state == power_state.RUNNING:
flags |= libvirt.VIR_DOMAIN_AFFECT_LIVE
virt_dom.detachDeviceFlags(xml, flags)
except libvirt.libvirtError as ex:
# NOTE(vish): This is called to cleanup volumes after live
# migration, so we should still disconnect even if
# the instance doesn't exist here anymore.
error_code = ex.get_error_code()
if error_code == libvirt.VIR_ERR_NO_DOMAIN:
# NOTE(vish):
LOG.warn(_("During detach_volume, instance disappeared."))
else:
raise
self.volume_driver_method('disconnect_volume',
connection_info,
mount_device)
@exception.wrap_exception()
def _attach_lxc_volume(self, xml, virt_dom, instance_name):
LOG.info(_('attaching LXC block device'))
lxc_container_root = self.get_lxc_container_root(virt_dom)
lxc_host_volume = self.get_lxc_host_device(xml)
lxc_container_device = self.get_lxc_container_target(xml)
lxc_container_target = "%s/%s" % (lxc_container_root,
lxc_container_device)
if lxc_container_target:
disk.bind(lxc_host_volume, lxc_container_target, instance_name)
@exception.wrap_exception()
def _detach_lxc_volume(self, xml, virt_dom, instance_name):
LOG.info(_('detaching LXC block device'))
lxc_container_root = self.get_lxc_container_root(virt_dom)
lxc_container_device = self.get_lxc_container_target(xml)
lxc_container_target = "%s/%s" % (lxc_container_root,
lxc_container_device)
if lxc_container_target:
disk.unbind(lxc_container_target)
@staticmethod
def get_lxc_container_root(virt_dom):
xml = virt_dom.XMLDesc(0)
doc = etree.fromstring(xml)
filesystem_block = doc.findall('./devices/filesystem')
for cnt, filesystem_nodes in enumerate(filesystem_block):
return filesystem_nodes[cnt].get('dir')
@staticmethod
def get_lxc_host_device(xml):
dom = minidom.parseString(xml)
for device in dom.getElementsByTagName('source'):
return device.getAttribute('dev')
@staticmethod
def get_lxc_container_target(xml):
dom = minidom.parseString(xml)
for device in dom.getElementsByTagName('target'):
filesystem = device.getAttribute('dev')
return 'dev/%s' % filesystem
@exception.wrap_exception()
def snapshot(self, context, instance, image_href):
"""Create snapshot from a running VM instance.
This command only works with qemu 0.14+
"""
try:
virt_dom = self._lookup_by_name(instance['name'])
except exception.InstanceNotFound:
raise exception.InstanceNotRunning()
(image_service, image_id) = glance.get_remote_image_service(
context, instance['image_ref'])
try:
base = image_service.show(context, image_id)
except exception.ImageNotFound:
base = {}
_image_service = glance.get_remote_image_service(context, image_href)
snapshot_image_service, snapshot_image_id = _image_service
snapshot = snapshot_image_service.show(context, snapshot_image_id)
metadata = {'is_public': False,
'status': 'active',
'name': snapshot['name'],
'properties': {
'kernel_id': instance['kernel_id'],
'image_location': 'snapshot',
'image_state': 'available',
'owner_id': instance['project_id'],
'ramdisk_id': instance['ramdisk_id'],
}
}
if 'architecture' in base.get('properties', {}):
arch = base['properties']['architecture']
metadata['properties']['architecture'] = arch
source_format = base.get('disk_format') or 'raw'
if source_format == 'ami':
# NOTE(vish): assume amis are raw
source_format = 'raw'
image_format = FLAGS.snapshot_image_format or source_format
use_qcow2 = ((FLAGS.libvirt_images_type == 'default' and
FLAGS.use_cow_images) or
FLAGS.libvirt_images_type == 'qcow2')
if use_qcow2:
source_format = 'qcow2'
# NOTE(vish): glance forces ami disk format to be ami
if base.get('disk_format') == 'ami':
metadata['disk_format'] = 'ami'
else:
metadata['disk_format'] = image_format
metadata['container_format'] = base.get('container_format', 'bare')
# Find the disk
xml_desc = virt_dom.XMLDesc(0)
domain = etree.fromstring(xml_desc)
source = domain.find('devices/disk/source')
disk_path = source.get('file')
snapshot_name = uuid.uuid4().hex
(state, _max_mem, _mem, _cpus, _t) = virt_dom.info()
state = LIBVIRT_POWER_STATE[state]
# NOTE(dkang): managedSave does not work for LXC
if FLAGS.libvirt_type != 'lxc':
if state == power_state.RUNNING:
virt_dom.managedSave(0)
# Make the snapshot
libvirt_utils.create_snapshot(disk_path, snapshot_name)
# Export the snapshot to a raw image
snapshot_directory = FLAGS.libvirt_snapshots_directory
utils.ensure_tree(snapshot_directory)
with utils.tempdir(dir=snapshot_directory) as tmpdir:
try:
out_path = os.path.join(tmpdir, snapshot_name)
libvirt_utils.extract_snapshot(disk_path, source_format,
snapshot_name, out_path,
image_format)
finally:
libvirt_utils.delete_snapshot(disk_path, snapshot_name)
# NOTE(dkang): because previous managedSave is not called
# for LXC, _create_domain must not be called.
if FLAGS.libvirt_type != 'lxc':
if state == power_state.RUNNING:
self._create_domain(domain=virt_dom)
# Upload that image to the image service
with libvirt_utils.file_open(out_path) as image_file:
image_service.update(context,
image_href,
metadata,
image_file)
@exception.wrap_exception()
def reboot(self, instance, network_info, reboot_type='SOFT',
block_device_info=None):
"""Reboot a virtual machine, given an instance reference."""
if reboot_type == 'SOFT':
# NOTE(vish): This will attempt to do a graceful shutdown/restart.
if self._soft_reboot(instance):
LOG.info(_("Instance soft rebooted successfully."),
instance=instance)
return
else:
LOG.warn(_("Failed to soft reboot instance."),
instance=instance)
return self._hard_reboot(instance, network_info,
block_device_info=block_device_info)
def _soft_reboot(self, instance):
"""Attempt to shutdown and restart the instance gracefully.
We use shutdown and create here so we can return if the guest
responded and actually rebooted. Note that this method only
succeeds if the guest responds to acpi. Therefore we return
success or failure so we can fall back to a hard reboot if
necessary.
:returns: True if the reboot succeeded
"""
dom = self._lookup_by_name(instance["name"])
(state, _max_mem, _mem, _cpus, _t) = dom.info()
state = LIBVIRT_POWER_STATE[state]
old_domid = dom.ID()
# NOTE(vish): This check allows us to reboot an instance that
# is already shutdown.
if state == power_state.RUNNING:
dom.shutdown()
# NOTE(vish): This actually could take slighty longer than the
# FLAG defines depending on how long the get_info
# call takes to return.
for x in xrange(FLAGS.libvirt_wait_soft_reboot_seconds):
dom = self._lookup_by_name(instance["name"])
(state, _max_mem, _mem, _cpus, _t) = dom.info()
state = LIBVIRT_POWER_STATE[state]
new_domid = dom.ID()
if state in [power_state.SHUTDOWN,
power_state.CRASHED]:
LOG.info(_("Instance shutdown successfully."),
instance=instance)
self._create_domain(domain=dom)
timer = utils.LoopingCall(self._wait_for_running, instance)
timer.start(interval=0.5).wait()
return True
elif old_domid != new_domid:
LOG.info(_("Instance may have been rebooted during soft "
"reboot, so return now."), instance=instance)
return True
greenthread.sleep(1)
return False
def _hard_reboot(self, instance, network_info, xml=None,
block_device_info=None):
"""Reboot a virtual machine, given an instance reference.
Performs a Libvirt reset (if supported) on the domain.
If Libvirt reset is unavailable this method actually destroys and
re-creates the domain to ensure the reboot happens, as the guest
OS cannot ignore this action.
If xml is set, it uses the passed in xml in place of the xml from the
existing domain.
"""
if not xml:
xml = self._get_domain_xml(instance, network_info,
block_device_info)
self._destroy(instance)
self._create_domain_and_network(xml, instance, network_info,
block_device_info)
def _wait_for_reboot():
"""Called at an interval until the VM is running again."""
state = self.get_info(instance)['state']
if state == power_state.RUNNING:
LOG.info(_("Instance rebooted successfully."),
instance=instance)
raise utils.LoopingCallDone()
timer = utils.LoopingCall(_wait_for_reboot)
timer.start(interval=0.5).wait()
@exception.wrap_exception()
def pause(self, instance):
"""Pause VM instance"""
dom = self._lookup_by_name(instance['name'])
dom.suspend()
@exception.wrap_exception()
def unpause(self, instance):
"""Unpause paused VM instance"""
dom = self._lookup_by_name(instance['name'])
dom.resume()
@exception.wrap_exception()
def power_off(self, instance):
"""Power off the specified instance"""
self._destroy(instance)
@exception.wrap_exception()
def power_on(self, instance):
"""Power on the specified instance"""
dom = self._lookup_by_name(instance['name'])
self._create_domain(domain=dom)
timer = utils.LoopingCall(self._wait_for_running, instance)
timer.start(interval=0.5).wait()
@exception.wrap_exception()
def suspend(self, instance):
"""Suspend the specified instance"""
dom = self._lookup_by_name(instance['name'])
dom.managedSave(0)
@exception.wrap_exception()
def resume(self, instance):
"""resume the specified instance"""
dom = self._lookup_by_name(instance['name'])
self._create_domain(domain=dom)
@exception.wrap_exception()
def resume_state_on_host_boot(self, context, instance, network_info,
block_device_info=None):
"""resume guest state when a host is booted"""
xml = self._get_domain_xml(instance, network_info, block_device_info)
self._create_domain_and_network(xml, instance, network_info,
block_device_info)
@exception.wrap_exception()
def rescue(self, context, instance, network_info, image_meta,
rescue_password):
"""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.
"""
unrescue_xml = self._get_domain_xml(instance, network_info)
unrescue_xml_path = os.path.join(FLAGS.instances_path,
instance['name'],
'unrescue.xml')
libvirt_utils.write_to_file(unrescue_xml_path, unrescue_xml)
rescue_images = {
'image_id': FLAGS.rescue_image_id or instance['image_ref'],
'kernel_id': FLAGS.rescue_kernel_id or instance['kernel_id'],
'ramdisk_id': FLAGS.rescue_ramdisk_id or instance['ramdisk_id'],
}
xml = self.to_xml(instance, network_info, image_meta,
rescue=rescue_images)
self._create_image(context, instance, xml, '.rescue', rescue_images,
network_info=network_info,
admin_pass=rescue_password)
self._destroy(instance)
self._create_domain(xml)
@exception.wrap_exception()
def unrescue(self, instance, network_info):
"""Reboot the VM which is being rescued back into primary images.
"""
unrescue_xml_path = os.path.join(FLAGS.instances_path,
instance['name'],
'unrescue.xml')
xml = libvirt_utils.load_file(unrescue_xml_path)
virt_dom = self._lookup_by_name(instance['name'])
self._destroy(instance)
self._create_domain(xml, virt_dom)
libvirt_utils.file_delete(unrescue_xml_path)
rescue_files = os.path.join(FLAGS.instances_path, instance['name'],
"*.rescue")
for rescue_file in glob.iglob(rescue_files):
libvirt_utils.file_delete(rescue_file)
@exception.wrap_exception()
def poll_rebooting_instances(self, timeout):
pass
@exception.wrap_exception()
def poll_rescued_instances(self, timeout):
pass
def _enable_hairpin(self, xml):
interfaces = self.get_interfaces(xml)
for interface in interfaces:
utils.execute('tee',
'/sys/class/net/%s/brport/hairpin_mode' % interface,
process_input='1',
run_as_root=True,
check_exit_code=[0, 1])
# NOTE(ilyaalekseyev): Implementation like in multinics
# for xenapi(tr3buchet)
@exception.wrap_exception()
def spawn(self, context, instance, image_meta, injected_files,
admin_password, network_info=None, block_device_info=None):
xml = self.to_xml(instance, network_info, image_meta,
block_device_info=block_device_info)
self._create_image(context, instance, xml, network_info=network_info,
block_device_info=block_device_info,
files=injected_files,
admin_pass=admin_password)
self._create_domain_and_network(xml, instance, network_info,
block_device_info)
LOG.debug(_("Instance is running"), instance=instance)
def _wait_for_boot():
"""Called at an interval until the VM is running."""
state = self.get_info(instance)['state']
if state == power_state.RUNNING:
LOG.info(_("Instance spawned successfully."),
instance=instance)
raise utils.LoopingCallDone()
timer = utils.LoopingCall(_wait_for_boot)
timer.start(interval=0.5).wait()
def _flush_libvirt_console(self, pty):
out, err = utils.execute('dd',
'if=%s' % pty,
'iflag=nonblock',
run_as_root=True,
check_exit_code=False)
return out
def _append_to_file(self, data, fpath):
LOG.info(_('data: %(data)r, fpath: %(fpath)r') % locals())
fp = open(fpath, 'a+')
fp.write(data)
return fpath
@exception.wrap_exception()
def get_console_output(self, instance):
virt_dom = self._lookup_by_name(instance['name'])
xml = virt_dom.XMLDesc(0)
tree = etree.fromstring(xml)
console_types = {}
# NOTE(comstud): We want to try 'file' types first, then try 'pty'
# types. We can't use Python 2.7 syntax of:
# tree.find("./devices/console[@type='file']/source")
# because we need to support 2.6.
console_nodes = tree.findall('./devices/console')
for console_node in console_nodes:
console_type = console_node.get('type')
console_types.setdefault(console_type, [])
console_types[console_type].append(console_node)
# If the guest has a console logging to a file prefer to use that
if console_types.get('file'):
for file_console in console_types.get('file'):
source_node = file_console.find('./source')
if source_node is None:
continue
path = source_node.get("path")
if not path:
continue
libvirt_utils.chown(path, os.getuid())
with libvirt_utils.file_open(path, 'rb') as fp:
log_data, remaining = utils.last_bytes(fp,
MAX_CONSOLE_BYTES)
if remaining > 0:
LOG.info(_('Truncated console log returned, %d bytes '
'ignored'), remaining, instance=instance)
return log_data
# Try 'pty' types
if console_types.get('pty'):
for pty_console in console_types.get('pty'):
source_node = pty_console.find('./source')
if source_node is None:
continue
pty = source_node.get("path")
if not pty:
continue
break
else:
msg = _("Guest does not have a console available")
raise exception.NovaException(msg)
self._chown_console_log_for_instance(instance['name'])
data = self._flush_libvirt_console(pty)
console_log = self._get_console_log_path(instance['name'])
fpath = self._append_to_file(data, console_log)
with libvirt_utils.file_open(fpath, 'rb') as fp:
log_data, remaining = utils.last_bytes(fp, MAX_CONSOLE_BYTES)
if remaining > 0:
LOG.info(_('Truncated console log returned, %d bytes ignored'),
remaining, instance=instance)
return log_data
@staticmethod
def get_host_ip_addr():
return FLAGS.my_ip
@exception.wrap_exception()
def get_vnc_console(self, instance):
def get_vnc_port_for_instance(instance_name):
virt_dom = self._lookup_by_name(instance_name)
xml = virt_dom.XMLDesc(0)
# TODO(sleepsonthefloor): use etree instead of minidom
dom = minidom.parseString(xml)
for graphic in dom.getElementsByTagName('graphics'):
if graphic.getAttribute('type') == 'vnc':
return graphic.getAttribute('port')
port = get_vnc_port_for_instance(instance['name'])
host = FLAGS.vncserver_proxyclient_address
return {'host': host, 'port': port, 'internal_access_path': None}
@staticmethod
def _supports_direct_io(dirpath):
if not hasattr(os, 'O_DIRECT'):
LOG.debug("This python runtime does not support direct I/O")
return False
testfile = os.path.join(dirpath, ".directio.test")
hasDirectIO = True
try:
f = os.open(testfile, os.O_CREAT | os.O_WRONLY | os.O_DIRECT)
os.close(f)
LOG.debug(_("Path '%(path)s' supports direct I/O") %
{'path': dirpath})
except OSError, e:
if e.errno == errno.EINVAL:
LOG.debug(_("Path '%(path)s' does not support direct I/O: "
"'%(ex)s'") % {'path': dirpath, 'ex': str(e)})
hasDirectIO = False
else:
LOG.error(_("Error on '%(path)s' while checking direct I/O: "
"'%(ex)s'") % {'path': dirpath, 'ex': str(e)})
raise e
except Exception, e:
LOG.error(_("Error on '%(path)s' while checking direct I/O: "
"'%(ex)s'") % {'path': dirpath, 'ex': str(e)})
raise e
finally:
try:
os.unlink(testfile)
except Exception:
pass
return hasDirectIO
@staticmethod
def _create_local(target, local_size, unit='G',
fs_format=None, label=None):
"""Create a blank image of specified size"""
if not fs_format:
fs_format = FLAGS.default_ephemeral_format
libvirt_utils.create_image('raw', target,
'%d%c' % (local_size, unit))
if fs_format:
libvirt_utils.mkfs(fs_format, target, label)
def _create_ephemeral(self, target, ephemeral_size, fs_label, os_type):
self._create_local(target, ephemeral_size)
disk.mkfs(os_type, fs_label, target)
@staticmethod
def _create_swap(target, swap_mb):
"""Create a swap file of specified size"""
libvirt_utils.create_image('raw', target, '%dM' % swap_mb)
libvirt_utils.mkfs('swap', target)
@staticmethod
def _get_console_log_path(instance_name):
return os.path.join(FLAGS.instances_path, instance_name,
'console.log')
def _chown_console_log_for_instance(self, instance_name):
console_log = self._get_console_log_path(instance_name)
if os.path.exists(console_log):
libvirt_utils.chown(console_log, os.getuid())
def _create_image(self, context, instance, libvirt_xml, suffix='',
disk_images=None, network_info=None,
block_device_info=None, files=None, admin_pass=None):
if not suffix:
suffix = ''
# Are we using a config drive?
using_config_drive = False
if (instance.get('config_drive') or
FLAGS.force_config_drive):
LOG.info(_('Using config drive'), instance=instance)
using_config_drive = True
# syntactic nicety
def basepath(fname='', suffix=suffix):
return os.path.join(FLAGS.instances_path,
instance['name'],
fname + suffix)
def image(fname, image_type=FLAGS.libvirt_images_type):
return self.image_backend.image(instance['name'],
fname + suffix, image_type)
def raw(fname):
return image(fname, image_type='raw')
# ensure directories exist and are writable
utils.ensure_tree(basepath(suffix=''))
LOG.info(_('Creating image'), instance=instance)
libvirt_utils.write_to_file(basepath('libvirt.xml'), libvirt_xml)
if FLAGS.libvirt_type == 'lxc':
container_dir = os.path.join(FLAGS.instances_path,
instance['name'],
'rootfs')
utils.ensure_tree(container_dir)
# NOTE(dprince): for rescue console.log may already exist... chown it.
self._chown_console_log_for_instance(instance['name'])
# NOTE(vish): No need add the suffix to console.log
libvirt_utils.write_to_file(basepath('console.log', ''), '', 007)
if not disk_images:
disk_images = {'image_id': instance['image_ref'],
'kernel_id': instance['kernel_id'],
'ramdisk_id': instance['ramdisk_id']}
if disk_images['kernel_id']:
fname = disk_images['kernel_id']
raw('kernel').cache(fetch_func=libvirt_utils.fetch_image,
context=context,
filename=fname,
image_id=disk_images['kernel_id'],
user_id=instance['user_id'],
project_id=instance['project_id'])
if disk_images['ramdisk_id']:
fname = disk_images['ramdisk_id']
raw('ramdisk').cache(fetch_func=libvirt_utils.fetch_image,
context=context,
filename=fname,
image_id=disk_images['ramdisk_id'],
user_id=instance['user_id'],
project_id=instance['project_id'])
root_fname = hashlib.sha1(str(disk_images['image_id'])).hexdigest()
size = instance['root_gb'] * 1024 * 1024 * 1024
inst_type_id = instance['instance_type_id']
inst_type = instance_types.get_instance_type(inst_type_id)
if size == 0 or suffix == '.rescue':
size = None
if not self._volume_in_mapping(self.default_root_device,
block_device_info):
image('disk').cache(fetch_func=libvirt_utils.fetch_image,
context=context,
filename=root_fname,
size=size,
image_id=disk_images['image_id'],
user_id=instance['user_id'],
project_id=instance['project_id'])
ephemeral_gb = instance['ephemeral_gb']
if ephemeral_gb and not self._volume_in_mapping(
self.default_second_device, block_device_info):
swap_device = self.default_third_device
fn = functools.partial(self._create_ephemeral,
fs_label='ephemeral0',
os_type=instance["os_type"])
fname = "ephemeral_%s_%s_%s" % ("0",
ephemeral_gb,
instance["os_type"])
size = ephemeral_gb * 1024 * 1024 * 1024
image('disk.local').cache(fetch_func=fn,
filename=fname,
size=size,
ephemeral_size=ephemeral_gb)
else:
swap_device = self.default_second_device
for eph in driver.block_device_info_get_ephemerals(block_device_info):
fn = functools.partial(self._create_ephemeral,
fs_label='ephemeral%d' % eph['num'],
os_type=instance["os_type"])
size = eph['size'] * 1024 * 1024 * 1024
fname = "ephemeral_%s_%s_%s" % (eph['num'],
eph['size'],
instance["os_type"])
image(_get_eph_disk(eph)).cache(fetch_func=fn,
filename=fname,
size=size,
ephemeral_size=eph['size'])
swap_mb = 0
swap = driver.block_device_info_get_swap(block_device_info)
if driver.swap_is_usable(swap):
swap_mb = swap['swap_size']
elif (inst_type['swap'] > 0 and
not self._volume_in_mapping(swap_device, block_device_info)):
swap_mb = inst_type['swap']
if swap_mb > 0:
size = swap_mb * 1024 * 1024
image('disk.swap').cache(fetch_func=self._create_swap,
filename="swap_%s" % swap_mb,
size=size,
swap_mb=swap_mb)
# target partition for file injection
target_partition = None
if not instance['kernel_id']:
target_partition = FLAGS.libvirt_inject_partition
if target_partition == 0:
target_partition = None
if FLAGS.libvirt_type == 'lxc':
target_partition = None
if FLAGS.libvirt_inject_key and instance['key_data']:
key = str(instance['key_data'])
else:
key = None
# File injection
metadata = instance.get('metadata')
if not FLAGS.libvirt_inject_password:
admin_pass = None
net = netutils.get_injected_network_template(network_info)
# Config drive
if using_config_drive:
extra_md = {}
if admin_pass:
extra_md['admin_pass'] = admin_pass
inst_md = instance_metadata.InstanceMetadata(instance,
content=files, extra_md=extra_md)
cdb = configdrive.ConfigDriveBuilder(instance_md=inst_md)
try:
configdrive_path = basepath(fname='disk.config')
LOG.info(_('Creating config drive at %(path)s'),
{'path': configdrive_path}, instance=instance)
cdb.make_drive(configdrive_path)
finally:
cdb.cleanup()
elif any((key, net, metadata, admin_pass, files)):
# If we're not using config_drive, inject into root fs
injection_path = image('disk').path
img_id = instance['image_ref']
for injection in ('metadata', 'key', 'net', 'admin_pass',
'files'):
if locals()[injection]:
LOG.info(_('Injecting %(injection)s into image'
' %(img_id)s'), locals(), instance=instance)
try:
disk.inject_data(injection_path,
key, net, metadata, admin_pass, files,
partition=target_partition,
use_cow=FLAGS.use_cow_images)
except Exception as e:
# This could be a windows image, or a vmdk format disk
LOG.warn(_('Ignoring error injecting data into image '
'%(img_id)s (%(e)s)') % locals(),
instance=instance)
if FLAGS.libvirt_type == 'lxc':
disk.setup_container(image('disk').path,
container_dir=container_dir,
use_cow=FLAGS.use_cow_images)
if FLAGS.libvirt_type == 'uml':
libvirt_utils.chown(image('disk').path, 'root')
@staticmethod
def _volume_in_mapping(mount_device, block_device_info):
block_device_list = [block_device.strip_dev(vol['mount_device'])
for vol in
driver.block_device_info_get_mapping(
block_device_info)]
swap = driver.block_device_info_get_swap(block_device_info)
if driver.swap_is_usable(swap):
block_device_list.append(
block_device.strip_dev(swap['device_name']))
block_device_list += [block_device.strip_dev(ephemeral['device_name'])
for ephemeral in
driver.block_device_info_get_ephemerals(
block_device_info)]
LOG.debug(_("block_device_list %s"), block_device_list)
return block_device.strip_dev(mount_device) in block_device_list
def get_host_capabilities(self):
"""Returns an instance of config.LibvirtConfigCaps representing
the capabilities of the host"""
if not self._caps:
xmlstr = self._conn.getCapabilities()
self._caps = config.LibvirtConfigCaps()
self._caps.parse_str(xmlstr)
return self._caps
def get_host_cpu_for_guest(self):
"""Returns an instance of config.LibvirtConfigGuestCPU
representing the host's CPU model & topology with
policy for configuring a guest to match"""
caps = self.get_host_capabilities()
hostcpu = caps.host.cpu
guestcpu = config.LibvirtConfigGuestCPU()
guestcpu.model = hostcpu.model
guestcpu.vendor = hostcpu.vendor
guestcpu.arch = hostcpu.arch
guestcpu.match = "exact"
for hostfeat in hostcpu.features:
guestfeat = config.LibvirtConfigGuestCPUFeature(hostfeat.name)
guestfeat.policy = "require"
guestcpu.features.append(guestfeat)
return guestcpu
def get_guest_cpu_config(self):
mode = FLAGS.libvirt_cpu_mode
model = FLAGS.libvirt_cpu_model
if mode is None:
if FLAGS.libvirt_type == "kvm" or FLAGS.libvirt_type == "qemu":
mode = "host-model"
else:
mode = "none"
if mode == "none":
return None
if FLAGS.libvirt_type != "kvm" and FLAGS.libvirt_type != "qemu":
msg = _("Config requested an explicit CPU model, but "
"the current libvirt hypervisor '%s' does not "
"support selecting CPU models") % FLAGS.libvirt_type
raise exception.Invalid(msg)
if mode == "custom" and model is None:
msg = _("Config requested a custom CPU model, but no "
"model name was provided")
raise exception.Invalid(msg)
elif mode != "custom" and model is not None:
msg = _("A CPU model name should not be set when a "
"host CPU model is requested")
raise exception.Invalid(msg)
LOG.debug(_("CPU mode '%(mode)s' model '%(model)s' was chosen")
% {'mode': mode, 'model': (model or "")})
# TODO(berrange): in the future, when MIN_LIBVIRT_VERSION is
# updated to be at least this new, we can kill off the elif
# blocks here
if self.has_min_version(MIN_LIBVIRT_HOST_CPU_VERSION):
cpu = config.LibvirtConfigGuestCPU()
cpu.mode = mode
cpu.model = model
elif mode == "custom":
cpu = config.LibvirtConfigGuestCPU()
cpu.model = model
elif mode == "host-model":
cpu = self.get_host_cpu_for_guest()
elif mode == "host-passthrough":
msg = _("Passthrough of the host CPU was requested but "
"this libvirt version does not support this feature")
raise exception.NovaException(msg)
return cpu
def get_guest_storage_config(self, instance, image_meta,
rescue, block_device_info,
inst_type,
root_device_name, root_device):
devices = []
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
if FLAGS.libvirt_type == "lxc":
fs = config.LibvirtConfigGuestFilesys()
fs.source_type = "mount"
fs.source_dir = os.path.join(FLAGS.instances_path,
instance['name'],
'rootfs')
devices.append(fs)
else:
if image_meta and image_meta.get('disk_format') == 'iso':
root_device_type = 'cdrom'
root_device = 'hda'
else:
root_device_type = 'disk'
if FLAGS.libvirt_type == "uml":
default_disk_bus = "uml"
elif FLAGS.libvirt_type == "xen":
default_disk_bus = "xen"
else:
default_disk_bus = "virtio"
def disk_info(name, disk_dev, disk_bus=default_disk_bus,
device_type="disk"):
image = self.image_backend.image(instance['name'],
name)
return image.libvirt_info(disk_bus,
disk_dev,
device_type,
self.disk_cachemode)
if rescue:
diskrescue = disk_info('disk.rescue',
self.default_root_device,
device_type=root_device_type)
devices.append(diskrescue)
diskos = disk_info('disk',
self.default_second_device)
devices.append(diskos)
else:
ebs_root = self._volume_in_mapping(self.default_root_device,
block_device_info)
if not ebs_root:
if root_device_type == "cdrom":
bus = "ide"
else:
bus = default_disk_bus
diskos = disk_info('disk',
root_device,
bus,
root_device_type)
devices.append(diskos)
ephemeral_device = None
if not (self._volume_in_mapping(self.default_second_device,
block_device_info) or
0 in [eph['num'] for eph in
driver.block_device_info_get_ephemerals(
block_device_info)]):
if instance['ephemeral_gb'] > 0:
ephemeral_device = self.default_second_device
if ephemeral_device is not None:
disklocal = disk_info('disk.local', ephemeral_device)
devices.append(disklocal)
if ephemeral_device is not None:
swap_device = self.default_third_device
db.instance_update(
nova_context.get_admin_context(), instance['uuid'],
{'default_ephemeral_device':
'/dev/' + self.default_second_device})
else:
swap_device = self.default_second_device
for eph in driver.block_device_info_get_ephemerals(
block_device_info):
diskeph = disk_info(_get_eph_disk(eph),
block_device.strip_dev(
eph['device_name']))
devices.append(diskeph)
swap = driver.block_device_info_get_swap(block_device_info)
if driver.swap_is_usable(swap):
diskswap = disk_info('disk.swap',
block_device.strip_dev(
swap['device_name']))
devices.append(diskswap)
elif (inst_type['swap'] > 0 and
not self._volume_in_mapping(swap_device,
block_device_info)):
diskswap = disk_info('disk.swap', swap_device)
devices.append(diskswap)
db.instance_update(
nova_context.get_admin_context(), instance['uuid'],
{'default_swap_device': '/dev/' + swap_device})
for vol in block_device_mapping:
connection_info = vol['connection_info']
mount_device = vol['mount_device'].rpartition("/")[2]
cfg = self.volume_driver_method('connect_volume',
connection_info,
mount_device)
devices.append(cfg)
if (instance.get('config_drive') or
instance.get('config_drive_id') or
FLAGS.force_config_drive):
diskconfig = config.LibvirtConfigGuestDisk()
diskconfig.source_type = "file"
diskconfig.driver_format = "raw"
diskconfig.driver_cache = self.disk_cachemode
diskconfig.source_path = os.path.join(FLAGS.instances_path,
instance['name'],
"disk.config")
diskconfig.target_dev = self.default_last_device
diskconfig.target_bus = default_disk_bus
devices.append(diskconfig)
return devices
def get_guest_config(self, instance, network_info, image_meta, rescue=None,
block_device_info=None):
"""Get config data for parameters.
:param rescue: optional dictionary that should contain the key
'ramdisk_id' if a ramdisk is needed for the rescue image and
'kernel_id' if a kernel is needed for the rescue image.
"""
# FIXME(vish): stick this in db
inst_type_id = instance['instance_type_id']
inst_type = instance_types.get_instance_type(inst_type_id,
inactive=True)
guest = config.LibvirtConfigGuest()
guest.virt_type = FLAGS.libvirt_type
guest.name = instance['name']
guest.uuid = instance['uuid']
guest.memory = inst_type['memory_mb'] * 1024
guest.vcpus = inst_type['vcpus']
guest.cpu = self.get_guest_cpu_config()
root_device_name = driver.block_device_info_get_root(block_device_info)
if root_device_name:
root_device = block_device.strip_dev(root_device_name)
else:
# NOTE(yamahata):
# for nova.api.ec2.cloud.CloudController.get_metadata()
root_device = self.default_root_device
db.instance_update(
nova_context.get_admin_context(), instance['uuid'],
{'root_device_name': '/dev/' + self.default_root_device})
guest.os_type = vm_mode.get_from_instance(instance)
if guest.os_type is None:
if FLAGS.libvirt_type == "lxc":
guest.os_type = vm_mode.EXE
elif FLAGS.libvirt_type == "uml":
guest.os_type = vm_mode.UML
elif FLAGS.libvirt_type == "xen":
guest.os_type = vm_mode.XEN
else:
guest.os_type = vm_mode.HVM
if FLAGS.libvirt_type == "xen" and guest.os_type == vm_mode.HVM:
guest.os_loader = '/usr/lib/xen/boot/hvmloader'
if FLAGS.libvirt_type == "lxc":
guest.os_type = vm_mode.EXE
guest.os_init_path = "/sbin/init"
guest.os_cmdline = "console=ttyS0"
elif FLAGS.libvirt_type == "uml":
guest.os_type = vm_mode.UML
guest.os_kernel = "/usr/bin/linux"
guest.os_root = root_device_name or "/dev/ubda"
else:
if FLAGS.libvirt_type == "xen" and guest.os_type == vm_mode.XEN:
guest.os_root = root_device_name or "/dev/xvda"
else:
guest.os_type = vm_mode.HVM
if rescue:
if rescue.get('kernel_id'):
guest.os_kernel = os.path.join(FLAGS.instances_path,
instance['name'],
"kernel.rescue")
if rescue.get('ramdisk_id'):
guest.os_initrd = os.path.join(FLAGS.instances_path,
instance['name'],
"ramdisk.rescue")
elif instance['kernel_id']:
guest.os_kernel = os.path.join(FLAGS.instances_path,
instance['name'],
"kernel")
if FLAGS.libvirt_type == "xen":
guest.os_cmdline = "ro"
else:
guest.os_cmdline = "root=%s console=ttyS0" % (
root_device_name or "/dev/vda",)
if instance['ramdisk_id']:
guest.os_initrd = os.path.join(FLAGS.instances_path,
instance['name'],
"ramdisk")
else:
guest.os_boot_dev = "hd"
if FLAGS.libvirt_type != "lxc" and FLAGS.libvirt_type != "uml":
guest.acpi = True
guest.apic = True
# NOTE(mikal): Microsoft Windows expects the clock to be in
# "localtime". If the clock is set to UTC, then you can use a
# registry key to let windows know, but Microsoft says this is
# buggy in http://support.microsoft.com/kb/2687252
clk = config.LibvirtConfigGuestClock()
if instance['os_type'] == 'windows':
LOG.info(_('Configuring timezone for windows instance to '
'localtime'), instance=instance)
clk.offset = 'localtime'
else:
clk.offset = 'utc'
guest.set_clock(clk)
if FLAGS.libvirt_type == "kvm":
# TODO(berrange) One day this should be per-guest
# OS type configurable
tmpit = config.LibvirtConfigGuestTimer()
tmpit.name = "pit"
tmpit.tickpolicy = "delay"
tmrtc = config.LibvirtConfigGuestTimer()
tmrtc.name = "rtc"
tmrtc.tickpolicy = "catchup"
clk.add_timer(tmpit)
clk.add_timer(tmrtc)
for cfg in self.get_guest_storage_config(instance,
image_meta,
rescue,
block_device_info,
inst_type,
root_device_name,
root_device):
guest.add_device(cfg)
for (network, mapping) in network_info:
cfg = self.vif_driver.plug(instance, (network, mapping))
guest.add_device(cfg)
if FLAGS.libvirt_type == "qemu" or FLAGS.libvirt_type == "kvm":
# The QEMU 'pty' driver throws away any data if no
# client app is connected. Thus we can't get away
# with a single type=pty console. Instead we have
# to configure two separate consoles.
consolelog = config.LibvirtConfigGuestSerial()
consolelog.type = "file"
consolelog.source_path = os.path.join(FLAGS.instances_path,
instance['name'],
"console.log")
guest.add_device(consolelog)
consolepty = config.LibvirtConfigGuestSerial()
consolepty.type = "pty"
guest.add_device(consolepty)
else:
consolepty = config.LibvirtConfigGuestConsole()
consolepty.type = "pty"
guest.add_device(consolepty)
if FLAGS.vnc_enabled and FLAGS.libvirt_type not in ('lxc', 'uml'):
if FLAGS.use_usb_tablet and guest.os_type == vm_mode.HVM:
tablet = config.LibvirtConfigGuestInput()
tablet.type = "tablet"
tablet.bus = "usb"
guest.add_device(tablet)
graphics = config.LibvirtConfigGuestGraphics()
graphics.type = "vnc"
graphics.keymap = FLAGS.vnc_keymap
graphics.listen = FLAGS.vncserver_listen
guest.add_device(graphics)
return guest
def to_xml(self, instance, network_info, image_meta=None, rescue=None,
block_device_info=None):
LOG.debug(_('Starting toXML method'), instance=instance)
conf = self.get_guest_config(instance, network_info, image_meta,
rescue, block_device_info)
xml = conf.to_xml()
LOG.debug(_('Finished toXML method'), instance=instance)
return xml
def _lookup_by_name(self, instance_name):
"""Retrieve libvirt domain object given an instance name.
All libvirt error handling should be handled in this method and
relevant nova exceptions should be raised in response.
"""
try:
return self._conn.lookupByName(instance_name)
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
if error_code == libvirt.VIR_ERR_NO_DOMAIN:
raise exception.InstanceNotFound(instance_id=instance_name)
msg = _("Error from libvirt while looking up %(instance_name)s: "
"[Error Code %(error_code)s] %(ex)s") % locals()
raise exception.NovaException(msg)
def get_info(self, instance):
"""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.
"""
virt_dom = self._lookup_by_name(instance['name'])
(state, max_mem, mem, num_cpu, cpu_time) = virt_dom.info()
return {'state': LIBVIRT_POWER_STATE[state],
'max_mem': max_mem,
'mem': mem,
'num_cpu': num_cpu,
'cpu_time': cpu_time}
def _create_domain(self, xml=None, domain=None, launch_flags=0):
"""Create a domain.
Either domain or xml must be passed in. If both are passed, then
the domain definition is overwritten from the xml.
"""
if xml:
domain = self._conn.defineXML(xml)
domain.createWithFlags(launch_flags)
self._enable_hairpin(domain.XMLDesc(0))
return domain
def _create_domain_and_network(self, xml, instance, network_info,
block_device_info=None):
"""Do required network setup and create domain."""
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
for vol in block_device_mapping:
connection_info = vol['connection_info']
mount_device = vol['mount_device'].rpartition("/")[2]
self.volume_driver_method('connect_volume',
connection_info,
mount_device)
self.plug_vifs(instance, network_info)
self.firewall_driver.setup_basic_filtering(instance, network_info)
self.firewall_driver.prepare_instance_filter(instance, network_info)
domain = self._create_domain(xml)
self.firewall_driver.apply_instance_filter(instance, network_info)
return domain
def get_all_block_devices(self):
"""
Return all block devices in use on this node.
"""
devices = []
for dom_id in self.list_instance_ids():
try:
domain = self._conn.lookupByID(dom_id)
doc = etree.fromstring(domain.XMLDesc(0))
except Exception:
continue
ret = doc.findall('./devices/disk')
for node in ret:
if node.get('type') != 'block':
continue
for child in node.getchildren():
if child.tag == 'source':
devices.append(child.get('dev'))
return devices
def get_disks(self, instance_name):
"""
Note that this function takes an instance name.
Returns a list of all block devices for this domain.
"""
domain = self._lookup_by_name(instance_name)
xml = domain.XMLDesc(0)
try:
doc = etree.fromstring(xml)
except Exception:
return []
return filter(bool,
[target.get("dev")
for target in doc.findall('devices/disk/target')])
def get_interfaces(self, xml):
"""
Note that this function takes an domain xml.
Returns a list of all network interfaces for this instance.
"""
doc = None
try:
doc = etree.fromstring(xml)
except Exception:
return []
interfaces = []
ret = doc.findall('./devices/interface')
for node in ret:
devdst = None
for child in list(node):
if child.tag == 'target':
devdst = child.attrib['dev']
if devdst is None:
continue
interfaces.append(devdst)
return interfaces
@staticmethod
def get_vcpu_total():
"""Get vcpu number of physical computer.
:returns: the number of cpu core.
"""
# On certain platforms, this will raise a NotImplementedError.
try:
return multiprocessing.cpu_count()
except NotImplementedError:
LOG.warn(_("Cannot get the number of cpu, because this "
"function is not implemented for this platform. "
"This error can be safely ignored for now."))
return 0
def get_memory_mb_total(self):
"""Get the total memory size(MB) of physical computer.
:returns: the total amount of memory(MB).
"""
return self._conn.getInfo()[1]
@staticmethod
def get_local_gb_total():
"""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.
"""
stats = libvirt_utils.get_fs_info(FLAGS.instances_path)
return stats['total'] / (1024 ** 3)
def get_vcpu_used(self):
""" Get vcpu usage number of physical computer.
:returns: The total number of vcpu that currently used.
"""
total = 0
for dom_id in self.list_instance_ids():
dom = self._conn.lookupByID(dom_id)
vcpus = dom.vcpus()
if vcpus is None:
# dom.vcpus is not implemented for lxc, but returning 0 for
# a used count is hardly useful for something measuring usage
total += 1
else:
total += len(vcpus[1])
# NOTE(gtt116): give change to do other task.
greenthread.sleep(0)
return total
def get_memory_mb_used(self):
"""Get the free memory size(MB) of physical computer.
:returns: the total usage of memory(MB).
"""
if sys.platform.upper() not in ['LINUX2', 'LINUX3']:
return 0
m = open('/proc/meminfo').read().split()
idx1 = m.index('MemFree:')
idx2 = m.index('Buffers:')
idx3 = m.index('Cached:')
if FLAGS.libvirt_type == 'xen':
used = 0
for domain_id in self.list_instance_ids():
# skip dom0
dom_mem = int(self._conn.lookupByID(domain_id).info()[2])
if domain_id != 0:
used += dom_mem
else:
# the mem reported by dom0 is be greater of what
# it is being used
used += (dom_mem -
(int(m[idx1 + 1]) +
int(m[idx2 + 1]) +
int(m[idx3 + 1])))
# Convert it to MB
return used / 1024
else:
avail = (int(m[idx1 + 1]) + int(m[idx2 + 1]) + int(m[idx3 + 1]))
# Convert it to MB
return self.get_memory_mb_total() - avail / 1024
def get_local_gb_used(self):
"""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.
"""
stats = libvirt_utils.get_fs_info(FLAGS.instances_path)
return stats['used'] / (1024 ** 3)
def get_hypervisor_type(self):
"""Get hypervisor type.
:returns: hypervisor type (ex. qemu)
"""
return self._conn.getType()
def get_hypervisor_version(self):
"""Get hypervisor version.
:returns: hypervisor version (ex. 12003)
"""
# NOTE(justinsb): getVersion moved between libvirt versions
# Trying to do be compatible with older versions is a lost cause
# But ... we can at least give the user a nice message
method = getattr(self._conn, 'getVersion', None)
if method is None:
raise exception.NovaException(_("libvirt version is too old"
" (does not support getVersion)"))
# NOTE(justinsb): If we wanted to get the version, we could:
# method = getattr(libvirt, 'getVersion', None)
# NOTE(justinsb): This would then rely on a proper version check
return method()
def get_hypervisor_hostname(self):
"""Returns the hostname of the hypervisor."""
return self._conn.getHostname()
def get_instance_capabilities(self):
"""Get hypervisor instance capabilities
Returns a list of tuples that describe instances the
hypervisor is capable of hosting. Each tuple consists
of the triplet (arch, hypervisor_type, vm_mode).
:returns: List of tuples describing instance capabilities
"""
caps = self.get_host_capabilities()
instance_caps = list()
for g in caps.guests:
for dt in g.domtype:
instance_cap = (g.arch, dt, g.ostype)
instance_caps.append(instance_cap)
return instance_caps
def get_cpu_info(self):
"""Get cpuinfo information.
Obtains cpu feature from virConnect.getCapabilities,
and returns as a json string.
:return: see above description
"""
caps = self.get_host_capabilities()
cpu_info = dict()
cpu_info['arch'] = caps.host.cpu.arch
cpu_info['model'] = caps.host.cpu.model
cpu_info['vendor'] = caps.host.cpu.vendor
topology = dict()
topology['sockets'] = caps.host.cpu.sockets
topology['cores'] = caps.host.cpu.cores
topology['threads'] = caps.host.cpu.threads
cpu_info['topology'] = topology
features = list()
for f in caps.host.cpu.features:
features.append(f.name)
cpu_info['features'] = features
# TODO(berrange): why do we bother converting the
# libvirt capabilities XML into a special JSON format ?
# The data format is different across all the drivers
# so we could just return the raw capabilties XML
# which 'compare_cpu' could use directly
#
# That said, arch_filter.py now seems to rely on
# the libvirt drivers format which suggests this
# data format needs to be standardized across drivers
return jsonutils.dumps(cpu_info)
def block_stats(self, instance_name, disk):
"""
Note that this function takes an instance name.
"""
domain = self._lookup_by_name(instance_name)
return domain.blockStats(disk)
def interface_stats(self, instance_name, interface):
"""
Note that this function takes an instance name.
"""
domain = self._lookup_by_name(instance_name)
return domain.interfaceStats(interface)
def get_console_pool_info(self, console_type):
#TODO(mdragon): console proxy should be implemented for libvirt,
# in case someone wants to use it with kvm or
# such. For now return fake data.
return {'address': '127.0.0.1',
'username': 'fakeuser',
'password': 'fakepassword'}
def refresh_security_group_rules(self, security_group_id):
self.firewall_driver.refresh_security_group_rules(security_group_id)
def refresh_security_group_members(self, security_group_id):
self.firewall_driver.refresh_security_group_members(security_group_id)
def refresh_instance_security_rules(self, instance):
self.firewall_driver.refresh_instance_security_rules(instance)
def refresh_provider_fw_rules(self):
self.firewall_driver.refresh_provider_fw_rules()
def get_available_resource(self):
"""Retrieve resource info.
This method is called as a periodic task and is used only
in live migration currently.
:returns: dictionary containing resource info
"""
dic = {'vcpus': self.get_vcpu_total(),
'memory_mb': self.get_memory_mb_total(),
'local_gb': self.get_local_gb_total(),
'vcpus_used': self.get_vcpu_used(),
'memory_mb_used': self.get_memory_mb_used(),
'local_gb_used': self.get_local_gb_used(),
'hypervisor_type': self.get_hypervisor_type(),
'hypervisor_version': self.get_hypervisor_version(),
'hypervisor_hostname': self.get_hypervisor_hostname(),
'cpu_info': self.get_cpu_info(),
'disk_available_least': self.get_disk_available_least()}
return dic
def check_can_live_migrate_destination(self, ctxt, instance_ref,
block_migration=False,
disk_over_commit=False):
"""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 ctxt: security context
:param instance_ref: nova.db.sqlalchemy.models.Instance
:param block_migration: if true, prepare for block migration
:param disk_over_commit: if true, allow disk over commit
"""
disk_available_mb = None
if block_migration:
disk_available_gb = self._get_compute_info(ctxt,
FLAGS.host)['disk_available_least']
disk_available_mb = \
(disk_available_gb * 1024) - FLAGS.reserved_host_disk_mb
# Compare CPU
src = instance_ref['host']
source_cpu_info = self._get_compute_info(ctxt, src)['cpu_info']
self._compare_cpu(source_cpu_info)
# Create file on storage, to be checked on source host
filename = self._create_shared_storage_test_file()
return {"filename": filename,
"block_migration": block_migration,
"disk_over_commit": disk_over_commit,
"disk_available_mb": disk_available_mb}
def check_can_live_migrate_destination_cleanup(self, ctxt,
dest_check_data):
"""Do required cleanup on dest host after check_can_live_migrate calls
:param ctxt: security context
"""
filename = dest_check_data["filename"]
self._cleanup_shared_storage_test_file(filename)
def check_can_live_migrate_source(self, ctxt, instance_ref,
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 context: security context
:param instance_ref: nova.db.sqlalchemy.models.Instance
:param dest_check_data: result of check_can_live_migrate_destination
"""
# Checking shared storage connectivity
# if block migration, instances_paths should not be on shared storage.
source = FLAGS.host
filename = dest_check_data["filename"]
block_migration = dest_check_data["block_migration"]
shared = self._check_shared_storage_test_file(filename)
if block_migration:
if shared:
reason = _("Block migration can not be used "
"with shared storage.")
raise exception.InvalidLocalStorage(reason=reason, path=source)
self._assert_dest_node_has_enough_disk(ctxt, instance_ref,
dest_check_data['disk_available_mb'],
dest_check_data['disk_over_commit'])
elif not shared:
reason = _("Live migration can not be used "
"without shared storage.")
raise exception.InvalidSharedStorage(reason=reason, path=source)
def _get_compute_info(self, context, host):
"""Get compute host's information specified by key"""
compute_node_ref = db.service_get_all_compute_by_host(context, host)
return compute_node_ref[0]['compute_node'][0]
def _assert_dest_node_has_enough_disk(self, context, instance_ref,
available_mb, disk_over_commit):
"""Checks if destination has enough disk for block migration."""
# Libvirt supports qcow2 disk format,which is usually compressed
# on compute nodes.
# Real disk image (compressed) may enlarged to "virtual disk size",
# that is specified as the maximum disk size.
# (See qemu-img -f path-to-disk)
# Scheduler recognizes destination host still has enough disk space
# if real disk size < available disk size
# if disk_over_commit is True,
# otherwise virtual disk size < available disk size.
available = available_mb * (1024 ** 2)
ret = self.get_instance_disk_info(instance_ref['name'])
disk_infos = jsonutils.loads(ret)
necessary = 0
if disk_over_commit:
for info in disk_infos:
necessary += int(info['disk_size'])
else:
for info in disk_infos:
necessary += int(info['virt_disk_size'])
# Check that available disk > necessary disk
if (available - necessary) < 0:
instance_uuid = instance_ref['uuid']
reason = _("Unable to migrate %(instance_uuid)s: "
"Disk of instance is too large(available"
" on destination host:%(available)s "
"< need:%(necessary)s)")
raise exception.MigrationError(reason=reason % locals())
def _compare_cpu(self, cpu_info):
"""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'
:param cpu_info: json string that shows cpu feature(see get_cpu_info())
:returns:
None. if given cpu info is not compatible to this server,
raise exception.
"""
info = jsonutils.loads(cpu_info)
LOG.info(_('Instance launched has CPU info:\n%s') % cpu_info)
cpu = config.LibvirtConfigCPU()
cpu.arch = info['arch']
cpu.model = info['model']
cpu.vendor = info['vendor']
cpu.sockets = info['topology']['sockets']
cpu.cores = info['topology']['cores']
cpu.threads = info['topology']['threads']
for f in info['features']:
cpu.add_feature(config.LibvirtConfigCPUFeature(f))
u = "http://libvirt.org/html/libvirt-libvirt.html#virCPUCompareResult"
m = _("CPU doesn't have compatibility.\n\n%(ret)s\n\nRefer to %(u)s")
# unknown character exists in xml, then libvirt complains
try:
ret = self._conn.compareCPU(cpu.to_xml(), 0)
except libvirt.libvirtError, e:
ret = e.message
LOG.error(m % locals())
raise
if ret <= 0:
LOG.error(m % locals())
raise exception.InvalidCPUInfo(reason=m % locals())
def _create_shared_storage_test_file(self):
"""Makes tmpfile under FLAGS.instance_path."""
dirpath = FLAGS.instances_path
fd, tmp_file = tempfile.mkstemp(dir=dirpath)
LOG.debug(_("Creating tmpfile %s to notify to other "
"compute nodes that they should mount "
"the same storage.") % tmp_file)
os.close(fd)
return os.path.basename(tmp_file)
def _check_shared_storage_test_file(self, filename):
"""Confirms existence of the tmpfile under FLAGS.instances_path.
Cannot confirm tmpfile return False."""
tmp_file = os.path.join(FLAGS.instances_path, filename)
if not os.path.exists(tmp_file):
return False
else:
return True
def _cleanup_shared_storage_test_file(self, filename):
"""Removes existence of the tmpfile under FLAGS.instances_path."""
tmp_file = os.path.join(FLAGS.instances_path, filename)
os.remove(tmp_file)
def ensure_filtering_rules_for_instance(self, instance_ref, network_info,
time_module=None):
"""Ensure that an instance's filtering rules are enabled.
When migrating an instance, we need the filtering rules to
be configured on the destination host before starting the
migration.
Also, when restarting the compute service, we need to ensure
that filtering rules exist for all running services.
"""
if not time_module:
time_module = greenthread
self.firewall_driver.setup_basic_filtering(instance_ref, network_info)
self.firewall_driver.prepare_instance_filter(instance_ref,
network_info)
# nwfilters may be defined in a separate thread in the case
# of libvirt non-blocking mode, so we wait for completion
timeout_count = range(FLAGS.live_migration_retry_count)
while timeout_count:
if self.firewall_driver.instance_filter_exists(instance_ref,
network_info):
break
timeout_count.pop()
if len(timeout_count) == 0:
msg = _('The firewall filter for %s does not exist')
raise exception.NovaException(msg % instance_ref["name"])
time_module.sleep(1)
def filter_defer_apply_on(self):
self.firewall_driver.filter_defer_apply_on()
def filter_defer_apply_off(self):
self.firewall_driver.filter_defer_apply_off()
def live_migration(self, ctxt, instance_ref, dest,
post_method, recover_method, block_migration=False,
migrate_data=None):
"""Spawning live_migration operation for distributing high-load.
:params ctxt: security context
: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.
:params migrate_data: implementation specific params
"""
greenthread.spawn(self._live_migration, ctxt, instance_ref, dest,
post_method, recover_method, block_migration)
def _live_migration(self, ctxt, instance_ref, dest, post_method,
recover_method, block_migration=False):
"""Do live migration.
:params ctxt: security context
:params instance_ref:
nova.db.sqlalchemy.models.Instance object
instance object that is migrated.
:params dest: 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.
"""
# Do live migration.
try:
if block_migration:
flaglist = FLAGS.block_migration_flag.split(',')
else:
flaglist = FLAGS.live_migration_flag.split(',')
flagvals = [getattr(libvirt, x.strip()) for x in flaglist]
logical_sum = reduce(lambda x, y: x | y, flagvals)
dom = self._lookup_by_name(instance_ref["name"])
dom.migrateToURI(FLAGS.live_migration_uri % dest,
logical_sum,
None,
FLAGS.live_migration_bandwidth)
except Exception as e:
with excutils.save_and_reraise_exception():
LOG.error(_("Live Migration failure: %(e)s") % locals(),
instance=instance_ref)
recover_method(ctxt, instance_ref, dest, block_migration)
# Waiting for completion of live_migration.
timer = utils.LoopingCall(f=None)
def wait_for_live_migration():
"""waiting for live migration completion"""
try:
self.get_info(instance_ref)['state']
except exception.NotFound:
timer.stop()
post_method(ctxt, instance_ref, dest, block_migration)
timer.f = wait_for_live_migration
timer.start(interval=0.5).wait()
def pre_live_migration(self, context, instance_ref, block_device_info,
network_info):
"""Preparation live migration."""
# Establishing connection to volume server.
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
for vol in block_device_mapping:
connection_info = vol['connection_info']
mount_device = vol['mount_device'].rpartition("/")[2]
self.volume_driver_method('connect_volume',
connection_info,
mount_device)
# We call plug_vifs before the compute manager calls
# ensure_filtering_rules_for_instance, to ensure bridge is set up
# Retry operation is necessary because continuously request comes,
# concorrent request occurs to iptables, then it complains.
max_retry = FLAGS.live_migration_retry_count
for cnt in range(max_retry):
try:
self.plug_vifs(instance_ref, network_info)
break
except exception.ProcessExecutionError:
if cnt == max_retry - 1:
raise
else:
LOG.warn(_("plug_vifs() failed %(cnt)d."
"Retry up to %(max_retry)d for %(hostname)s.")
% locals())
greenthread.sleep(1)
def pre_block_migration(self, ctxt, instance, disk_info_json):
"""Preparation block migration.
:params ctxt: security context
:params instance:
nova.db.sqlalchemy.models.Instance object
instance object that is migrated.
:params disk_info_json:
json strings specified in get_instance_disk_info
"""
disk_info = jsonutils.loads(disk_info_json)
# make instance directory
instance_dir = os.path.join(FLAGS.instances_path, instance['name'])
if os.path.exists(instance_dir):
raise exception.DestinationDiskExists(path=instance_dir)
os.mkdir(instance_dir)
for info in disk_info:
base = os.path.basename(info['path'])
# Get image type and create empty disk image, and
# create backing file in case of qcow2.
instance_disk = os.path.join(instance_dir, base)
if not info['backing_file']:
libvirt_utils.create_image(info['type'], instance_disk,
info['disk_size'])
else:
# Creating backing file follows same way as spawning instances.
cache_name = os.path.basename(info['backing_file'])
# Remove any size tags which the cache manages
cache_name = cache_name.split('_')[0]
image = self.image_backend.image(instance['name'],
instance_disk,
FLAGS.libvirt_images_type)
image.cache(fetch_func=libvirt_utils.fetch_image,
context=ctxt,
filename=cache_name,
image_id=instance['image_ref'],
user_id=instance['user_id'],
project_id=instance['project_id'],
size=info['virt_disk_size'])
# if image has kernel and ramdisk, just download
# following normal way.
if instance['kernel_id']:
libvirt_utils.fetch_image(ctxt,
os.path.join(instance_dir, 'kernel'),
instance['kernel_id'],
instance['user_id'],
instance['project_id'])
if instance['ramdisk_id']:
libvirt_utils.fetch_image(ctxt,
os.path.join(instance_dir,
'ramdisk'),
instance['ramdisk_id'],
instance['user_id'],
instance['project_id'])
def post_live_migration_at_destination(self, ctxt,
instance_ref,
network_info,
block_migration):
"""Post operation of live migration at destination host.
:param ctxt: security context
:param instance_ref:
nova.db.sqlalchemy.models.Instance object
instance object that is migrated.
:param network_info: instance network infomation
:param block_migration: if true, post operation of block_migraiton.
"""
# Define migrated instance, otherwise, suspend/destroy does not work.
dom_list = self._conn.listDefinedDomains()
if instance_ref["name"] not in dom_list:
instance_dir = os.path.join(FLAGS.instances_path,
instance_ref["name"])
xml_path = os.path.join(instance_dir, 'libvirt.xml')
# In case of block migration, destination does not have
# libvirt.xml
if not os.path.isfile(xml_path):
xml = self.to_xml(instance_ref, network_info=network_info)
f = open(os.path.join(instance_dir, 'libvirt.xml'), 'w+')
f.write(xml)
f.close()
# libvirt.xml should be made by to_xml(), but libvirt
# does not accept to_xml() result, since uuid is not
# included in to_xml() result.
dom = self._lookup_by_name(instance_ref["name"])
self._conn.defineXML(dom.XMLDesc(0))
def get_instance_disk_info(self, instance_name):
"""Preparation block migration.
:params ctxt: security context
:params instance_ref:
nova.db.sqlalchemy.models.Instance object
instance object that is migrated.
:return:
json strings with below format::
"[{'path':'disk', 'type':'raw',
'virt_disk_size':'10737418240',
'backing_file':'backing_file',
'disk_size':'83886080'},...]"
"""
disk_info = []
virt_dom = self._lookup_by_name(instance_name)
xml = virt_dom.XMLDesc(0)
doc = etree.fromstring(xml)
disk_nodes = doc.findall('.//devices/disk')
path_nodes = doc.findall('.//devices/disk/source')
driver_nodes = doc.findall('.//devices/disk/driver')
for cnt, path_node in enumerate(path_nodes):
disk_type = disk_nodes[cnt].get('type')
path = path_node.get('file')
if disk_type != 'file':
LOG.debug(_('skipping %(path)s since it looks like volume') %
locals())
continue
if not path:
LOG.debug(_('skipping disk for %(instance_name)s as it'
' does not have a path') %
locals())
continue
# get the real disk size or
# raise a localized error if image is unavailable
dk_size = int(os.path.getsize(path))
disk_type = driver_nodes[cnt].get('type')
if disk_type == "qcow2":
backing_file = libvirt_utils.get_disk_backing_file(path)
virt_size = disk.get_disk_size(path)
else:
backing_file = ""
virt_size = 0
disk_info.append({'type': disk_type,
'path': path,
'virt_disk_size': virt_size,
'backing_file': backing_file,
'disk_size': dk_size})
return jsonutils.dumps(disk_info)
def get_disk_available_least(self):
"""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.
"""
# available size of the disk
dk_sz_gb = self.get_local_gb_total() - self.get_local_gb_used()
# Disk size that all instance uses : virtual_size - disk_size
instances_name = self.list_instances()
instances_sz = 0
for i_name in instances_name:
try:
disk_infos = jsonutils.loads(
self.get_instance_disk_info(i_name))
for info in disk_infos:
i_vt_sz = int(info['virt_disk_size'])
i_dk_sz = int(info['disk_size'])
instances_sz += i_vt_sz - i_dk_sz
except OSError as e:
if e.errno == errno.ENOENT:
LOG.error(_("Getting disk size of %(i_name)s: %(e)s") %
locals())
else:
raise
except exception.InstanceNotFound:
# Instance was deleted during the check so ignore it
pass
# NOTE(gtt116): give change to do other task.
greenthread.sleep(0)
# Disk available least size
available_least_size = dk_sz_gb * (1024 ** 3) - instances_sz
return (available_least_size / 1024 / 1024 / 1024)
def unfilter_instance(self, instance_ref, network_info):
"""See comments of same method in firewall_driver."""
self.firewall_driver.unfilter_instance(instance_ref,
network_info=network_info)
def update_host_status(self):
"""Retrieve status info from libvirt.
Query libvirt to get the state of the compute node, such
as memory and disk usage.
"""
return self.host_state.update_status()
def get_host_stats(self, refresh=False):
"""Return the current state of the host.
If 'refresh' is True, run update the stats first."""
return self.host_state.get_host_stats(refresh=refresh)
def host_power_action(self, host, action):
"""Reboots, shuts down or powers up the host."""
raise NotImplementedError()
def host_maintenance_mode(self, host, mode):
"""Start/Stop host maintenance window. On start, it triggers
guest VMs evacuation."""
raise NotImplementedError()
def set_host_enabled(self, host, enabled):
"""Sets the specified host's ability to accept new instances."""
pass
def get_host_uptime(self, host):
"""Returns the result of calling "uptime"."""
#NOTE(dprince): host seems to be ignored for this call and in
# other compute drivers as well. Perhaps we should remove it?
out, err = utils.execute('env', 'LANG=C', 'uptime')
return out
def manage_image_cache(self, context):
"""Manage the local cache of images."""
self.image_cache_manager.verify_base_images(context)
@exception.wrap_exception()
def migrate_disk_and_power_off(self, context, instance, dest,
instance_type, network_info,
block_device_info=None):
LOG.debug(_("Starting migrate_disk_and_power_off"),
instance=instance)
disk_info_text = self.get_instance_disk_info(instance['name'])
disk_info = jsonutils.loads(disk_info_text)
self.power_off(instance)
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
for vol in block_device_mapping:
connection_info = vol['connection_info']
mount_device = vol['mount_device'].rpartition("/")[2]
self.volume_driver_method('disconnect_volume',
connection_info,
mount_device)
# copy disks to destination
# rename instance dir to +_resize at first for using
# shared storage for instance dir (eg. NFS).
same_host = (dest == self.get_host_ip_addr())
inst_base = "%s/%s" % (FLAGS.instances_path, instance['name'])
inst_base_resize = inst_base + "_resize"
try:
utils.execute('mv', inst_base, inst_base_resize)
if same_host:
dest = None
utils.execute('mkdir', '-p', inst_base)
else:
utils.execute('ssh', dest, 'mkdir', '-p', inst_base)
for info in disk_info:
# assume inst_base == dirname(info['path'])
img_path = info['path']
fname = os.path.basename(img_path)
from_path = os.path.join(inst_base_resize, fname)
if info['type'] == 'qcow2' and info['backing_file']:
tmp_path = from_path + "_rbase"
# merge backing file
utils.execute('qemu-img', 'convert', '-f', 'qcow2',
'-O', 'qcow2', from_path, tmp_path)
if same_host:
utils.execute('mv', tmp_path, img_path)
else:
libvirt_utils.copy_image(tmp_path, img_path, host=dest)
utils.execute('rm', '-f', tmp_path)
else: # raw or qcow2 with no backing file
libvirt_utils.copy_image(from_path, img_path, host=dest)
except Exception, e:
try:
if os.path.exists(inst_base_resize):
utils.execute('rm', '-rf', inst_base)
utils.execute('mv', inst_base_resize, inst_base)
utils.execute('ssh', dest, 'rm', '-rf', inst_base)
except Exception:
pass
raise e
return disk_info_text
def _wait_for_running(self, instance):
state = self.get_info(instance)['state']
if state == power_state.RUNNING:
LOG.info(_("Instance running successfully."), instance=instance)
raise utils.LoopingCallDone()
@exception.wrap_exception()
def finish_migration(self, context, migration, instance, disk_info,
network_info, image_meta, resize_instance,
block_device_info=None):
LOG.debug(_("Starting finish_migration"), instance=instance)
# resize disks. only "disk" and "disk.local" are necessary.
disk_info = jsonutils.loads(disk_info)
for info in disk_info:
fname = os.path.basename(info['path'])
if fname == 'disk':
size = instance['root_gb']
elif fname == 'disk.local':
size = instance['ephemeral_gb']
else:
size = 0
size *= 1024 * 1024 * 1024
# If we have a non partitioned image that we can extend
# then ensure we're in 'raw' format so we can extend file system.
fmt = info['type']
if (size and fmt == 'qcow2' and
disk.can_resize_fs(info['path'], size, use_cow=True)):
path_raw = info['path'] + '_raw'
utils.execute('qemu-img', 'convert', '-f', 'qcow2',
'-O', 'raw', info['path'], path_raw)
utils.execute('mv', path_raw, info['path'])
fmt = 'raw'
if size:
disk.extend(info['path'], size)
if fmt == 'raw' and FLAGS.use_cow_images:
# back to qcow2 (no backing_file though) so that snapshot
# will be available
path_qcow = info['path'] + '_qcow'
utils.execute('qemu-img', 'convert', '-f', 'raw',
'-O', 'qcow2', info['path'], path_qcow)
utils.execute('mv', path_qcow, info['path'])
xml = self.to_xml(instance, network_info,
block_device_info=block_device_info)
# assume _create_image do nothing if a target file exists.
# TODO(oda): injecting files is not necessary
self._create_image(context, instance, xml,
network_info=network_info,
block_device_info=None)
self._create_domain_and_network(xml, instance, network_info,
block_device_info)
timer = utils.LoopingCall(self._wait_for_running, instance)
timer.start(interval=0.5).wait()
@exception.wrap_exception()
def finish_revert_migration(self, instance, network_info,
block_device_info=None):
LOG.debug(_("Starting finish_revert_migration"),
instance=instance)
inst_base = "%s/%s" % (FLAGS.instances_path, instance['name'])
inst_base_resize = inst_base + "_resize"
utils.execute('mv', inst_base_resize, inst_base)
xml = self.to_xml(instance, network_info,
block_device_info=block_device_info)
self._create_domain_and_network(xml, instance, network_info,
block_device_info)
timer = utils.LoopingCall(self._wait_for_running, instance)
timer.start(interval=0.5).wait()
def confirm_migration(self, migration, instance, network_info):
"""Confirms a resize, destroying the source VM"""
self._cleanup_resize(instance, network_info)
def get_diagnostics(self, instance):
def get_io_devices(xml_doc):
""" get the list of io devices from the
xml document."""
result = {"volumes": [], "ifaces": []}
try:
doc = etree.fromstring(xml_doc)
except Exception:
return result
blocks = [('./devices/disk', 'volumes'),
('./devices/interface', 'ifaces')]
for block, key in blocks:
section = doc.findall(block)
for node in section:
for child in node.getchildren():
if child.tag == 'target' and child.get('dev'):
result[key].append(child.get('dev'))
return result
domain = self._lookup_by_name(instance['name'])
output = {}
# get cpu time, might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
try:
cputime = domain.vcpus()[0]
for i in range(len(cputime)):
output["cpu" + str(i) + "_time"] = cputime[i][2]
except libvirt.libvirtError:
pass
# get io status
xml = domain.XMLDesc(0)
dom_io = get_io_devices(xml)
for disk in dom_io["volumes"]:
try:
# blockStats might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
stats = domain.blockStats(disk)
output[disk + "_read_req"] = stats[0]
output[disk + "_read"] = stats[1]
output[disk + "_write_req"] = stats[2]
output[disk + "_write"] = stats[3]
output[disk + "_errors"] = stats[4]
except libvirt.libvirtError:
pass
for interface in dom_io["ifaces"]:
try:
# interfaceStats might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
stats = domain.interfaceStats(interface)
output[interface + "_rx"] = stats[0]
output[interface + "_rx_packets"] = stats[1]
output[interface + "_rx_errors"] = stats[2]
output[interface + "_rx_drop"] = stats[3]
output[interface + "_tx"] = stats[4]
output[interface + "_tx_packets"] = stats[5]
output[interface + "_tx_errors"] = stats[6]
output[interface + "_tx_drop"] = stats[7]
except libvirt.libvirtError:
pass
output["memory"] = domain.maxMemory()
# memoryStats might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
try:
mem = domain.memoryStats()
for key in mem.keys():
output["memory-" + key] = mem[key]
except libvirt.libvirtError:
pass
return output
def add_to_aggregate(self, context, aggregate, host, **kwargs):
"""Add a compute host to an aggregate."""
#NOTE(jogo) Currently only used for XenAPI-Pool
pass
def remove_from_aggregate(self, context, aggregate, host, **kwargs):
"""Remove a compute host from an aggregate."""
pass
def undo_aggregate_operation(self, context, op, aggregate_id,
host, set_error=True):
"""only used for Resource Pools"""
pass
class HostState(object):
"""Manages information about the compute node through libvirt"""
def __init__(self, read_only):
super(HostState, self).__init__()
self.read_only = read_only
self._stats = {}
self.connection = None
self.update_status()
def get_host_stats(self, refresh=False):
"""Return the current state of the host.
If 'refresh' is True, run update the stats first."""
if refresh:
self.update_status()
return self._stats
def update_status(self):
"""Retrieve status info from libvirt."""
LOG.debug(_("Updating host stats"))
if self.connection is None:
self.connection = LibvirtDriver(self.read_only)
data = {}
data["vcpus"] = self.connection.get_vcpu_total()
data["vcpus_used"] = self.connection.get_vcpu_used()
data["cpu_info"] = jsonutils.loads(self.connection.get_cpu_info())
data["disk_total"] = self.connection.get_local_gb_total()
data["disk_used"] = self.connection.get_local_gb_used()
data["disk_available"] = data["disk_total"] - data["disk_used"]
data["host_memory_total"] = self.connection.get_memory_mb_total()
data["host_memory_free"] = (data["host_memory_total"] -
self.connection.get_memory_mb_used())
data["hypervisor_type"] = self.connection.get_hypervisor_type()
data["hypervisor_version"] = self.connection.get_hypervisor_version()
data["hypervisor_hostname"] = self.connection.get_hypervisor_hostname()
data["supported_instances"] = \
self.connection.get_instance_capabilities()
self._stats = data
return data
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