/
driver.py
7665 lines (6578 loc) · 336 KB
/
driver.py
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# 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
# (c) Copyright 2013 Hewlett-Packard Development Company, L.P.
#
# 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, XEN and Parallels.
"""
import collections
from collections import deque
import contextlib
import errno
import functools
import glob
import itertools
import mmap
import operator
import os
import shutil
import tempfile
import time
import uuid
import eventlet
from eventlet import greenthread
from eventlet import tpool
from lxml import etree
from os_brick.initiator import connector
from oslo_concurrency import processutils
from oslo_log import log as logging
from oslo_serialization import jsonutils
from oslo_service import loopingcall
from oslo_utils import excutils
from oslo_utils import fileutils
from oslo_utils import importutils
from oslo_utils import strutils
from oslo_utils import timeutils
from oslo_utils import units
import six
from six.moves import range
from nova.api.metadata import base as instance_metadata
from nova import block_device
from nova.compute import arch
from nova.compute import hv_type
from nova.compute import power_state
from nova.compute import task_states
from nova.compute import utils as compute_utils
from nova.compute import vm_mode
import nova.conf
from nova.console import serial as serial_console
from nova.console import type as ctype
from nova import context as nova_context
from nova import exception
from nova.i18n import _
from nova.i18n import _LE
from nova.i18n import _LI
from nova.i18n import _LW
from nova import image
from nova.network import model as network_model
from nova import objects
from nova.objects import fields
from nova.objects import migrate_data as migrate_data_obj
from nova.pci import manager as pci_manager
from nova.pci import utils as pci_utils
from nova import utils
from nova import version
from nova.virt import block_device as driver_block_device
from nova.virt import configdrive
from nova.virt import diagnostics
from nova.virt.disk import api as disk_api
from nova.virt.disk.vfs import guestfs
from nova.virt import driver
from nova.virt import firewall
from nova.virt import hardware
from nova.virt.image import model as imgmodel
from nova.virt import images
from nova.virt.libvirt import blockinfo
from nova.virt.libvirt import config as vconfig
from nova.virt.libvirt import firewall as libvirt_firewall
from nova.virt.libvirt import guest as libvirt_guest
from nova.virt.libvirt import host
from nova.virt.libvirt import imagebackend
from nova.virt.libvirt import imagecache
from nova.virt.libvirt import instancejobtracker
from nova.virt.libvirt import migration as libvirt_migrate
from nova.virt.libvirt.storage import dmcrypt
from nova.virt.libvirt.storage import lvm
from nova.virt.libvirt.storage import rbd_utils
from nova.virt.libvirt import utils as libvirt_utils
from nova.virt.libvirt import vif as libvirt_vif
from nova.virt.libvirt.volume import remotefs
from nova.virt import netutils
from nova.virt import watchdog_actions
from nova.volume import cinder
from nova.volume import encryptors
libvirt = None
uefi_logged = False
LOG = logging.getLogger(__name__)
CONF = nova.conf.CONF
DEFAULT_FIREWALL_DRIVER = "%s.%s" % (
libvirt_firewall.__name__,
libvirt_firewall.IptablesFirewallDriver.__name__)
DEFAULT_UEFI_LOADER_PATH = {
"x86_64": "/usr/share/OVMF/OVMF_CODE.fd",
"aarch64": "/usr/share/AAVMF/AAVMF_CODE.fd"
}
MAX_CONSOLE_BYTES = 100 * units.Ki
# The libvirt driver will prefix any disable reason codes with this string.
DISABLE_PREFIX = 'AUTO: '
# Disable reason for the service which was enabled or disabled without reason
DISABLE_REASON_UNDEFINED = None
# Guest config console string
CONSOLE = "console=tty0 console=ttyS0"
GuestNumaConfig = collections.namedtuple(
'GuestNumaConfig', ['cpuset', 'cputune', 'numaconfig', 'numatune'])
libvirt_volume_drivers = [
'iscsi=nova.virt.libvirt.volume.iscsi.LibvirtISCSIVolumeDriver',
'iser=nova.virt.libvirt.volume.iser.LibvirtISERVolumeDriver',
'local=nova.virt.libvirt.volume.volume.LibvirtVolumeDriver',
'fake=nova.virt.libvirt.volume.volume.LibvirtFakeVolumeDriver',
'rbd=nova.virt.libvirt.volume.net.LibvirtNetVolumeDriver',
'sheepdog=nova.virt.libvirt.volume.net.LibvirtNetVolumeDriver',
'nfs=nova.virt.libvirt.volume.nfs.LibvirtNFSVolumeDriver',
'smbfs=nova.virt.libvirt.volume.smbfs.LibvirtSMBFSVolumeDriver',
'aoe=nova.virt.libvirt.volume.aoe.LibvirtAOEVolumeDriver',
'glusterfs='
'nova.virt.libvirt.volume.glusterfs.LibvirtGlusterfsVolumeDriver',
'fibre_channel='
'nova.virt.libvirt.volume.fibrechannel.'
'LibvirtFibreChannelVolumeDriver',
'scality=nova.virt.libvirt.volume.scality.LibvirtScalityVolumeDriver',
'gpfs=nova.virt.libvirt.volume.gpfs.LibvirtGPFSVolumeDriver',
'quobyte=nova.virt.libvirt.volume.quobyte.LibvirtQuobyteVolumeDriver',
'hgst=nova.virt.libvirt.volume.hgst.LibvirtHGSTVolumeDriver',
'scaleio=nova.virt.libvirt.volume.scaleio.LibvirtScaleIOVolumeDriver',
'disco=nova.virt.libvirt.volume.disco.LibvirtDISCOVolumeDriver',
'vzstorage='
'nova.virt.libvirt.volume.vzstorage.LibvirtVZStorageVolumeDriver',
]
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()
# For information about when MIN_LIBVIRT_VERSION and
# NEXT_MIN_LIBVIRT_VERSION can be changed, consult
#
# https://wiki.openstack.org/wiki/LibvirtDistroSupportMatrix
#
# Currently this is effectively the min version for i686/x86_64
# + KVM/QEMU, as other architectures/hypervisors require newer
# versions. Over time, this will become a common min version
# for all architectures/hypervisors, as this value rises to
# meet them.
MIN_LIBVIRT_VERSION = (1, 2, 1)
MIN_QEMU_VERSION = (1, 5, 3)
# TODO(berrange): Re-evaluate this at start of each release cycle
# to decide if we want to plan a future min version bump.
# MIN_LIBVIRT_VERSION can be updated to match this after
# NEXT_MIN_LIBVIRT_VERSION has been at a higher value for
# one cycle
NEXT_MIN_LIBVIRT_VERSION = (1, 2, 1)
NEXT_MIN_QEMU_VERSION = (1, 5, 3)
# When the above version matches/exceeds this version
# delete it & corresponding code using it
# Relative block commit & rebase (feature is detected,
# this version is only used for messaging)
MIN_LIBVIRT_BLOCKJOB_RELATIVE_VERSION = (1, 2, 7)
# Libvirt version 1.2.17 is required for successful block live migration
# of vm booted from image with attached devices
MIN_LIBVIRT_BLOCK_LM_WITH_VOLUMES_VERSION = (1, 2, 17)
# libvirt discard feature
MIN_QEMU_DISCARD_VERSION = (1, 6, 0)
# While earlier versions could support NUMA reporting and
# NUMA placement, not until 1.2.7 was there the ability
# to pin guest nodes to host nodes, so mandate that. Without
# this the scheduler cannot make guaranteed decisions, as the
# guest placement may not match what was requested
MIN_LIBVIRT_NUMA_VERSION = (1, 2, 7)
# PowerPC based hosts that support NUMA using libvirt
MIN_LIBVIRT_NUMA_VERSION_PPC = (1, 2, 19)
# Versions of libvirt with known NUMA topology issues
# See bug #1449028
BAD_LIBVIRT_NUMA_VERSIONS = [(1, 2, 9, 2)]
# While earlier versions could support hugepage backed
# guests, not until 1.2.8 was there the ability to request
# a particular huge page size. Without this the scheduler
# cannot make guaranteed decisions, as the huge page size
# used by the guest may not match what was requested
MIN_LIBVIRT_HUGEPAGE_VERSION = (1, 2, 8)
# Versions of libvirt with broken cpu pinning support. This excludes
# versions of libvirt with broken NUMA support since pinning needs
# NUMA
# See bug #1438226
BAD_LIBVIRT_CPU_POLICY_VERSIONS = [(1, 2, 10)]
# qemu 2.1 introduces support for pinning memory on host
# NUMA nodes, along with the ability to specify hugepage
# sizes per guest NUMA node
MIN_QEMU_NUMA_HUGEPAGE_VERSION = (2, 1, 0)
# fsFreeze/fsThaw requirement
MIN_LIBVIRT_FSFREEZE_VERSION = (1, 2, 5)
# UEFI booting support
MIN_LIBVIRT_UEFI_VERSION = (1, 2, 9)
# Hyper-V paravirtualized time source
MIN_LIBVIRT_HYPERV_TIMER_VERSION = (1, 2, 2)
MIN_QEMU_HYPERV_TIMER_VERSION = (2, 0, 0)
# parallels driver support
MIN_LIBVIRT_PARALLELS_VERSION = (1, 2, 12)
# Ability to set the user guest password with Qemu
MIN_LIBVIRT_SET_ADMIN_PASSWD = (1, 2, 16)
# s/390 & s/390x architectures with KVM
MIN_LIBVIRT_KVM_S390_VERSION = (1, 2, 13)
MIN_QEMU_S390_VERSION = (2, 3, 0)
# libvirt < 1.3 reported virt_functions capability
# only when VFs are enabled.
# libvirt 1.3 fix f391889f4e942e22b9ef8ecca492de05106ce41e
MIN_LIBVIRT_PF_WITH_NO_VFS_CAP_VERSION = (1, 3, 0)
# ppc64/ppc64le architectures with KVM
# NOTE(rfolco): Same levels for Libvirt/Qemu on Big Endian and Little
# Endian giving the nuance around guest vs host architectures
MIN_LIBVIRT_KVM_PPC64_VERSION = (1, 2, 12)
MIN_QEMU_PPC64_VERSION = (2, 1, 0)
# Auto converge support
MIN_LIBVIRT_AUTO_CONVERGE_VERSION = (1, 2, 3)
MIN_QEMU_AUTO_CONVERGE = (1, 6, 0)
# Names of the types that do not get compressed during migration
NO_COMPRESSION_TYPES = ('qcow2',)
# number of serial console limit
QEMU_MAX_SERIAL_PORTS = 4
# Qemu supports 4 serial consoles, we remove 1 because of the PTY one defined
ALLOWED_QEMU_SERIAL_PORTS = QEMU_MAX_SERIAL_PORTS - 1
# realtime support
MIN_LIBVIRT_REALTIME_VERSION = (1, 2, 13)
# libvirt postcopy support
MIN_LIBVIRT_POSTCOPY_VERSION = (1, 3, 3)
# qemu postcopy support
MIN_QEMU_POSTCOPY_VERSION = (2, 5, 0)
MIN_LIBVIRT_OTHER_ARCH = {arch.S390: MIN_LIBVIRT_KVM_S390_VERSION,
arch.S390X: MIN_LIBVIRT_KVM_S390_VERSION,
arch.PPC: MIN_LIBVIRT_KVM_PPC64_VERSION,
arch.PPC64: MIN_LIBVIRT_KVM_PPC64_VERSION,
arch.PPC64LE: MIN_LIBVIRT_KVM_PPC64_VERSION,
}
MIN_QEMU_OTHER_ARCH = {arch.S390: MIN_QEMU_S390_VERSION,
arch.S390X: MIN_QEMU_S390_VERSION,
arch.PPC: MIN_QEMU_PPC64_VERSION,
arch.PPC64: MIN_QEMU_PPC64_VERSION,
arch.PPC64LE: MIN_QEMU_PPC64_VERSION,
}
# perf events support
MIN_LIBVIRT_PERF_VERSION = (2, 0, 0)
LIBVIRT_PERF_EVENT_PREFIX = 'VIR_PERF_PARAM_'
PERF_EVENTS_CPU_FLAG_MAPPING = {'cmt': 'cmt',
'mbml': 'mbm_local',
'mbmt': 'mbm_total',
}
class LibvirtDriver(driver.ComputeDriver):
capabilities = {
"has_imagecache": True,
"supports_recreate": True,
"supports_migrate_to_same_host": False,
"supports_attach_interface": True,
"supports_device_tagging": True,
}
def __init__(self, virtapi, read_only=False):
super(LibvirtDriver, self).__init__(virtapi)
global libvirt
if libvirt is None:
libvirt = importutils.import_module('libvirt')
libvirt_migrate.libvirt = libvirt
self._host = host.Host(self._uri(), read_only,
lifecycle_event_handler=self.emit_event,
conn_event_handler=self._handle_conn_event)
self._initiator = None
self._fc_wwnns = None
self._fc_wwpns = None
self._caps = None
self._supported_perf_events = []
self.firewall_driver = firewall.load_driver(
DEFAULT_FIREWALL_DRIVER,
host=self._host)
self.vif_driver = libvirt_vif.LibvirtGenericVIFDriver()
self.volume_drivers = driver.driver_dict_from_config(
self._get_volume_drivers(), self)
self._disk_cachemode = None
self.image_cache_manager = imagecache.ImageCacheManager()
self.image_backend = imagebackend.Backend(CONF.use_cow_images)
self.disk_cachemodes = {}
self.valid_cachemodes = ["default",
"none",
"writethrough",
"writeback",
"directsync",
"unsafe",
]
self._conn_supports_start_paused = CONF.libvirt.virt_type in ('kvm',
'qemu')
for mode_str in CONF.libvirt.disk_cachemodes:
disk_type, sep, cache_mode = mode_str.partition('=')
if cache_mode not in self.valid_cachemodes:
LOG.warning(_LW('Invalid cachemode %(cache_mode)s specified '
'for disk type %(disk_type)s.'),
{'cache_mode': cache_mode, 'disk_type': disk_type})
continue
self.disk_cachemodes[disk_type] = cache_mode
self._volume_api = cinder.API()
self._image_api = image.API()
sysinfo_serial_funcs = {
'none': lambda: None,
'hardware': self._get_host_sysinfo_serial_hardware,
'os': self._get_host_sysinfo_serial_os,
'auto': self._get_host_sysinfo_serial_auto,
}
self._sysinfo_serial_func = sysinfo_serial_funcs.get(
CONF.libvirt.sysinfo_serial)
self.job_tracker = instancejobtracker.InstanceJobTracker()
self._remotefs = remotefs.RemoteFilesystem()
self._live_migration_flags = self._block_migration_flags = 0
self.active_migrations = {}
# Compute reserved hugepages from conf file at the very
# beginning to ensure any syntax error will be reported and
# avoid any re-calculation when computing resources.
self._reserved_hugepages = hardware.numa_get_reserved_huge_pages()
def _get_volume_drivers(self):
return libvirt_volume_drivers
@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 coherent (cluster filesystems
# typically are, but things like NFS are not).
self._disk_cachemode = "none"
if not self._supports_direct_io(CONF.instances_path):
self._disk_cachemode = "writethrough"
return self._disk_cachemode
def _set_cache_mode(self, conf):
"""Set cache mode on LibvirtConfigGuestDisk object."""
try:
source_type = conf.source_type
driver_cache = conf.driver_cache
except AttributeError:
return
cache_mode = self.disk_cachemodes.get(source_type,
driver_cache)
conf.driver_cache = cache_mode
def _do_quality_warnings(self):
"""Warn about untested driver configurations.
This will log a warning message about untested driver or host arch
configurations to indicate to administrators that the quality is
unknown. Currently, only qemu or kvm on intel 32- or 64-bit systems
is tested upstream.
"""
caps = self._host.get_capabilities()
hostarch = caps.host.cpu.arch
if (CONF.libvirt.virt_type not in ('qemu', 'kvm') or
hostarch not in (arch.I686, arch.X86_64)):
LOG.warning(_LW('The libvirt driver is not tested on '
'%(type)s/%(arch)s by the OpenStack project and '
'thus its quality can not be ensured. For more '
'information, see: http://docs.openstack.org/'
'developer/nova/support-matrix.html'),
{'type': CONF.libvirt.virt_type, 'arch': hostarch})
def _handle_conn_event(self, enabled, reason):
LOG.info(_LI("Connection event '%(enabled)d' reason '%(reason)s'"),
{'enabled': enabled, 'reason': reason})
self._set_host_enabled(enabled, reason)
def _version_to_string(self, version):
return '.'.join([str(x) for x in version])
def init_host(self, host):
self._host.initialize()
self._do_quality_warnings()
self._parse_migration_flags()
self._supported_perf_events = self._get_supported_perf_events()
if (CONF.libvirt.virt_type == 'lxc' and
not (CONF.libvirt.uid_maps and CONF.libvirt.gid_maps)):
LOG.warning(_LW("Running libvirt-lxc without user namespaces is "
"dangerous. Containers spawned by Nova will be run "
"as the host's root user. It is highly suggested "
"that user namespaces be used in a public or "
"multi-tenant environment."))
# Stop libguestfs using KVM unless we're also configured
# to use this. This solves problem where people need to
# stop Nova use of KVM because nested-virt is broken
if CONF.libvirt.virt_type != "kvm":
guestfs.force_tcg()
if not self._host.has_min_version(MIN_LIBVIRT_VERSION):
raise exception.NovaException(
_('Nova requires libvirt version %s or greater.') %
self._version_to_string(MIN_LIBVIRT_VERSION))
if (CONF.libvirt.virt_type in ("qemu", "kvm") and
not self._host.has_min_version(hv_ver=MIN_QEMU_VERSION)):
raise exception.NovaException(
_('Nova requires QEMU version %s or greater.') %
self._version_to_string(MIN_QEMU_VERSION))
if (CONF.libvirt.virt_type == 'parallels' and
not self._host.has_min_version(MIN_LIBVIRT_PARALLELS_VERSION)):
raise exception.NovaException(
_('Running Nova with parallels virt_type requires '
'libvirt version %s') %
self._version_to_string(MIN_LIBVIRT_PARALLELS_VERSION))
# Give the cloud admin a heads up if we are intending to
# change the MIN_LIBVIRT_VERSION in the next release.
if not self._host.has_min_version(NEXT_MIN_LIBVIRT_VERSION):
LOG.warning(_LW('Running Nova with a libvirt version less than '
'%(version)s is deprecated. The required minimum '
'version of libvirt will be raised to %(version)s '
'in the next release.'),
{'version': self._version_to_string(
NEXT_MIN_LIBVIRT_VERSION)})
if (CONF.libvirt.virt_type in ("qemu", "kvm") and
not self._host.has_min_version(hv_ver=NEXT_MIN_QEMU_VERSION)):
LOG.warning(_LW('Running Nova with a QEMU version less than '
'%(version)s is deprecated. The required minimum '
'version of QEMU will be raised to %(version)s '
'in the next release.'),
{'version': self._version_to_string(
NEXT_MIN_QEMU_VERSION)})
kvm_arch = arch.from_host()
if (CONF.libvirt.virt_type in ('kvm', 'qemu') and
kvm_arch in MIN_LIBVIRT_OTHER_ARCH and
not self._host.has_min_version(
MIN_LIBVIRT_OTHER_ARCH.get(kvm_arch),
MIN_QEMU_OTHER_ARCH.get(kvm_arch))):
raise exception.NovaException(
_('Running Nova with qemu/kvm virt_type on %(arch)s '
'requires libvirt version %(libvirt_ver)s and '
'qemu version %(qemu_ver)s, or greater') %
{'arch': kvm_arch,
'libvirt_ver': self._version_to_string(
MIN_LIBVIRT_OTHER_ARCH.get(kvm_arch)),
'qemu_ver': self._version_to_string(
MIN_QEMU_OTHER_ARCH.get(kvm_arch))})
def _prepare_migration_flags(self):
migration_flags = 0
migration_flags |= libvirt.VIR_MIGRATE_LIVE
# Adding p2p flag only if xen is not in use, because xen does not
# support p2p migrations
if CONF.libvirt.virt_type != 'xen':
migration_flags |= libvirt.VIR_MIGRATE_PEER2PEER
# Adding VIR_MIGRATE_UNDEFINE_SOURCE because, without it, migrated
# instance will remain defined on the source host
migration_flags |= libvirt.VIR_MIGRATE_UNDEFINE_SOURCE
live_migration_flags = block_migration_flags = migration_flags
# Adding VIR_MIGRATE_NON_SHARED_INC, otherwise all block-migrations
# will be live-migrations instead
block_migration_flags |= libvirt.VIR_MIGRATE_NON_SHARED_INC
return (live_migration_flags, block_migration_flags)
def _handle_live_migration_tunnelled(self, migration_flags):
if (CONF.libvirt.live_migration_tunnelled is None or
CONF.libvirt.live_migration_tunnelled):
migration_flags |= libvirt.VIR_MIGRATE_TUNNELLED
return migration_flags
def _is_post_copy_available(self):
if self._host.has_min_version(lv_ver=MIN_LIBVIRT_POSTCOPY_VERSION,
hv_ver=MIN_QEMU_POSTCOPY_VERSION):
return True
return False
def _handle_live_migration_post_copy(self, migration_flags):
if CONF.libvirt.live_migration_permit_post_copy:
if self._is_post_copy_available():
migration_flags |= libvirt.VIR_MIGRATE_POSTCOPY
else:
LOG.info(_LI('The live_migration_permit_post_copy is set '
'to True, but it is not supported.'))
return migration_flags
def _handle_live_migration_auto_converge(self, migration_flags):
if self._host.has_min_version(lv_ver=MIN_LIBVIRT_AUTO_CONVERGE_VERSION,
hv_ver=MIN_QEMU_AUTO_CONVERGE):
if (self._is_post_copy_available() and
(migration_flags & libvirt.VIR_MIGRATE_POSTCOPY) != 0):
LOG.info(_LI('The live_migration_permit_post_copy is set to '
'True and post copy live migration is available '
'so auto-converge will not be in use.'))
elif CONF.libvirt.live_migration_permit_auto_converge:
migration_flags |= libvirt.VIR_MIGRATE_AUTO_CONVERGE
elif CONF.libvirt.live_migration_permit_auto_converge:
LOG.info(_LI('The live_migration_permit_auto_converge is set '
'to True, but it is not supported.'))
return migration_flags
def _parse_migration_flags(self):
(live_migration_flags,
block_migration_flags) = self._prepare_migration_flags()
live_migration_flags = self._handle_live_migration_tunnelled(
live_migration_flags)
block_migration_flags = self._handle_live_migration_tunnelled(
block_migration_flags)
live_migration_flags = self._handle_live_migration_post_copy(
live_migration_flags)
block_migration_flags = self._handle_live_migration_post_copy(
block_migration_flags)
live_migration_flags = self._handle_live_migration_auto_converge(
live_migration_flags)
block_migration_flags = self._handle_live_migration_auto_converge(
block_migration_flags)
self._live_migration_flags = live_migration_flags
self._block_migration_flags = block_migration_flags
# TODO(sahid): This method is targeted for removal when the tests
# have been updated to avoid its use
#
# All libvirt API calls on the libvirt.Connect object should be
# encapsulated by methods on the nova.virt.libvirt.host.Host
# object, rather than directly invoking the libvirt APIs. The goal
# is to avoid a direct dependency on the libvirt API from the
# driver.py file.
def _get_connection(self):
return self._host.get_connection()
_conn = property(_get_connection)
@staticmethod
def _uri():
if CONF.libvirt.virt_type == 'uml':
uri = CONF.libvirt.connection_uri or 'uml:///system'
elif CONF.libvirt.virt_type == 'xen':
uri = CONF.libvirt.connection_uri or 'xen:///'
elif CONF.libvirt.virt_type == 'lxc':
uri = CONF.libvirt.connection_uri or 'lxc:///'
elif CONF.libvirt.virt_type == 'parallels':
uri = CONF.libvirt.connection_uri or 'parallels:///system'
else:
uri = CONF.libvirt.connection_uri or 'qemu:///system'
return uri
@staticmethod
def _live_migration_uri(dest):
# Only Xen and QEMU support live migration, see
# https://libvirt.org/migration.html#scenarios for reference
uris = {
'kvm': 'qemu+tcp://%s/system',
'qemu': 'qemu+tcp://%s/system',
'xen': 'xenmigr://%s/system',
}
virt_type = CONF.libvirt.virt_type
uri = CONF.libvirt.live_migration_uri or uris.get(virt_type)
if uri is None:
raise exception.LiveMigrationURINotAvailable(virt_type=virt_type)
return uri % dest
def instance_exists(self, instance):
"""Efficient override of base instance_exists method."""
try:
self._host.get_guest(instance)
return True
except exception.NovaException:
return False
def list_instances(self):
names = []
for guest in self._host.list_guests(only_running=False):
names.append(guest.name)
return names
def list_instance_uuids(self):
uuids = []
for guest in self._host.list_guests(only_running=False):
uuids.append(guest.uuid)
return uuids
def plug_vifs(self, instance, network_info):
"""Plug VIFs into networks."""
for vif in network_info:
self.vif_driver.plug(instance, vif)
def _unplug_vifs(self, instance, network_info, ignore_errors):
"""Unplug VIFs from networks."""
for vif in network_info:
try:
self.vif_driver.unplug(instance, vif)
except exception.NovaException:
if not ignore_errors:
raise
def unplug_vifs(self, instance, network_info):
self._unplug_vifs(instance, network_info, False)
def _teardown_container(self, instance):
inst_path = libvirt_utils.get_instance_path(instance)
container_dir = os.path.join(inst_path, 'rootfs')
rootfs_dev = instance.system_metadata.get('rootfs_device_name')
LOG.debug('Attempting to teardown container at path %(dir)s with '
'root device: %(rootfs_dev)s',
{'dir': container_dir, 'rootfs_dev': rootfs_dev},
instance=instance)
disk_api.teardown_container(container_dir, rootfs_dev)
def _destroy(self, instance, attempt=1):
try:
guest = self._host.get_guest(instance)
if CONF.serial_console.enabled:
# This method is called for several events: destroy,
# rebuild, hard-reboot, power-off - For all of these
# events we want to release the serial ports acquired
# for the guest before destroying it.
serials = self._get_serial_ports_from_guest(guest)
for hostname, port in serials:
serial_console.release_port(host=hostname, port=port)
except exception.InstanceNotFound:
guest = None
# If the instance is already terminated, we're still happy
# Otherwise, destroy it
old_domid = -1
if guest is not None:
try:
old_domid = guest.id
guest.poweroff()
except libvirt.libvirtError as e:
is_okay = False
errcode = e.get_error_code()
if errcode == libvirt.VIR_ERR_NO_DOMAIN:
# Domain already gone. This can safely be ignored.
is_okay = True
elif 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 = guest.get_power_state(self._host)
if state == power_state.SHUTDOWN:
is_okay = True
elif errcode == libvirt.VIR_ERR_INTERNAL_ERROR:
errmsg = e.get_error_message()
if (CONF.libvirt.virt_type == 'lxc' and
errmsg == 'internal error: '
'Some processes refused to die'):
# Some processes in the container didn't die
# fast enough for libvirt. The container will
# eventually die. For now, move on and let
# the wait_for_destroy logic take over.
is_okay = True
elif errcode == libvirt.VIR_ERR_OPERATION_TIMEOUT:
LOG.warning(_LW("Cannot destroy instance, operation time "
"out"),
instance=instance)
reason = _("operation time out")
raise exception.InstancePowerOffFailure(reason=reason)
elif errcode == libvirt.VIR_ERR_SYSTEM_ERROR:
if e.get_int1() == errno.EBUSY:
# NOTE(danpb): When libvirt kills a process it sends it
# SIGTERM first and waits 10 seconds. If it hasn't gone
# it sends SIGKILL and waits another 5 seconds. If it
# still hasn't gone then you get this EBUSY error.
# Usually when a QEMU process fails to go away upon
# SIGKILL it is because it is stuck in an
# uninterruptible kernel sleep waiting on I/O from
# some non-responsive server.
# Given the CPU load of the gate tests though, it is
# conceivable that the 15 second timeout is too short,
# particularly if the VM running tempest has a high
# steal time from the cloud host. ie 15 wallclock
# seconds may have passed, but the VM might have only
# have a few seconds of scheduled run time.
LOG.warning(_LW('Error from libvirt during destroy. '
'Code=%(errcode)s Error=%(e)s; '
'attempt %(attempt)d of 3'),
{'errcode': errcode, 'e': e,
'attempt': attempt},
instance=instance)
with excutils.save_and_reraise_exception() as ctxt:
# Try up to 3 times before giving up.
if attempt < 3:
ctxt.reraise = False
self._destroy(instance, attempt + 1)
return
if not is_okay:
with excutils.save_and_reraise_exception():
LOG.error(_LE('Error from libvirt during destroy. '
'Code=%(errcode)s Error=%(e)s'),
{'errcode': errcode, 'e': e},
instance=instance)
def _wait_for_destroy(expected_domid):
"""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:
dom_info = self.get_info(instance)
state = dom_info.state
new_domid = dom_info.id
except exception.InstanceNotFound:
LOG.info(_LI("During wait destroy, instance disappeared."),
instance=instance)
raise loopingcall.LoopingCallDone()
if state == power_state.SHUTDOWN:
LOG.info(_LI("Instance destroyed successfully."),
instance=instance)
raise loopingcall.LoopingCallDone()
# NOTE(wangpan): If the instance was booted again after destroy,
# this may be an endless loop, so check the id of
# domain here, if it changed and the instance is
# still running, we should destroy it again.
# see https://bugs.launchpad.net/nova/+bug/1111213 for more details
if new_domid != expected_domid:
LOG.info(_LI("Instance may be started again."),
instance=instance)
kwargs['is_running'] = True
raise loopingcall.LoopingCallDone()
kwargs = {'is_running': False}
timer = loopingcall.FixedIntervalLoopingCall(_wait_for_destroy,
old_domid)
timer.start(interval=0.5).wait()
if kwargs['is_running']:
LOG.info(_LI("Going to destroy instance again."),
instance=instance)
self._destroy(instance)
else:
# NOTE(GuanQiang): teardown container to avoid resource leak
if CONF.libvirt.virt_type == 'lxc':
self._teardown_container(instance)
def destroy(self, context, instance, network_info, block_device_info=None,
destroy_disks=True, migrate_data=None):
self._destroy(instance)
self.cleanup(context, instance, network_info, block_device_info,
destroy_disks, migrate_data)
def _undefine_domain(self, instance):
try:
guest = self._host.get_guest(instance)
try:
guest.delete_configuration()
except libvirt.libvirtError as e:
with excutils.save_and_reraise_exception():
errcode = e.get_error_code()
LOG.error(_LE('Error from libvirt during undefine. '
'Code=%(errcode)s Error=%(e)s'),
{'errcode': errcode, 'e': e}, instance=instance)
except exception.InstanceNotFound:
pass
def cleanup(self, context, instance, network_info, block_device_info=None,
destroy_disks=True, migrate_data=None, destroy_vifs=True):
if destroy_vifs:
self._unplug_vifs(instance, network_info, True)
retry = True
while retry:
try:
self.unfilter_instance(instance, network_info)
except libvirt.libvirtError as e:
try:
state = self.get_info(instance).state
except exception.InstanceNotFound:
state = power_state.SHUTDOWN
if state != power_state.SHUTDOWN:
LOG.warning(_LW("Instance may be still running, destroy "
"it again."), instance=instance)
self._destroy(instance)
else:
retry = False
errcode = e.get_error_code()
LOG.exception(_LE('Error from libvirt during unfilter. '
'Code=%(errcode)s Error=%(e)s'),
{'errcode': errcode, 'e': e},
instance=instance)
reason = "Error unfiltering instance."
raise exception.InstanceTerminationFailure(reason=reason)
except Exception:
retry = False
raise
else:
retry = False
# FIXME(wangpan): if the instance is booted again here, such as the
# the soft reboot operation boot it here, it will
# become "running deleted", should we check and destroy
# it at the end of this method?
# 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']
disk_dev = vol['mount_device']
if disk_dev is not None:
disk_dev = disk_dev.rpartition("/")[2]
if ('data' in connection_info and
'volume_id' in connection_info['data']):
volume_id = connection_info['data']['volume_id']
encryption = encryptors.get_encryption_metadata(
context, self._volume_api, volume_id, connection_info)
if encryption:
# The volume must be detached from the VM before
# disconnecting it from its encryptor. Otherwise, the
# encryptor may report that the volume is still in use.
encryptor = self._get_volume_encryptor(connection_info,
encryption)
encryptor.detach_volume(**encryption)
try:
self._disconnect_volume(connection_info, disk_dev)
except Exception as exc:
with excutils.save_and_reraise_exception() as ctxt:
if destroy_disks:
# Don't block on Volume errors if we're trying to
# delete the instance as we may be partially created
# or deleted
ctxt.reraise = False
LOG.warning(
_LW("Ignoring Volume Error on vol %(vol_id)s "
"during delete %(exc)s"),
{'vol_id': vol.get('volume_id'), 'exc': exc},
instance=instance)
if destroy_disks:
# NOTE(haomai): destroy volumes if needed
if CONF.libvirt.images_type == 'lvm':
self._cleanup_lvm(instance, block_device_info)
if CONF.libvirt.images_type == 'rbd':
self._cleanup_rbd(instance)
is_shared_block_storage = False
if migrate_data and 'is_shared_block_storage' in migrate_data:
is_shared_block_storage = migrate_data.is_shared_block_storage
if destroy_disks or is_shared_block_storage:
attempts = int(instance.system_metadata.get('clean_attempts',
'0'))
success = self.delete_instance_files(instance)
# NOTE(mriedem): This is used in the _run_pending_deletes periodic
# task in the compute manager. The tight coupling is not great...
instance.system_metadata['clean_attempts'] = str(attempts + 1)
if success:
instance.cleaned = True
instance.save()
self._undefine_domain(instance)
def _detach_encrypted_volumes(self, instance, block_device_info):
"""Detaches encrypted volumes attached to instance."""
disks = jsonutils.loads(self.get_instance_disk_info(instance,
block_device_info))
encrypted_volumes = filter(dmcrypt.is_encrypted,
[disk['path'] for disk in disks])
for path in encrypted_volumes:
dmcrypt.delete_volume(path)
def _get_serial_ports_from_guest(self, guest, mode=None):
"""Returns an iterator over serial port(s) configured on guest.
:param mode: Should be a value in (None, bind, connect)
"""
xml = guest.get_xml_desc()
tree = etree.fromstring(xml)
# The 'serial' device is the base for x86 platforms. Other platforms
# (e.g. kvm on system z = arch.S390X) can only use 'console' devices.
xpath_mode = "[@mode='%s']" % mode if mode else ""
serial_tcp = "./devices/serial[@type='tcp']/source" + xpath_mode
console_tcp = "./devices/console[@type='tcp']/source" + xpath_mode
tcp_devices = tree.findall(serial_tcp)
if len(tcp_devices) == 0:
tcp_devices = tree.findall(console_tcp)
for source in tcp_devices:
yield (source.get("host"), int(source.get("service")))
@staticmethod
def _get_rbd_driver():
return rbd_utils.RBDDriver(
pool=CONF.libvirt.images_rbd_pool,
ceph_conf=CONF.libvirt.images_rbd_ceph_conf,
rbd_user=CONF.libvirt.rbd_user)
def _cleanup_rbd(self, instance):
LibvirtDriver._get_rbd_driver().cleanup_volumes(instance)
def _cleanup_lvm(self, instance, block_device_info):
"""Delete all LVM disks for given instance object."""