openstack
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nova
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nova/nova/compute/manager.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.
# Copyright 2011 Justin Santa Barbara
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Handles all processes relating to instances (guest vms).
The :py:class:`ComputeManager` class is a :py:class:`nova.manager.Manager` that
handles RPC calls relating to creating instances. It is responsible for
building a disk image, launching it via the underlying virtualization driver,
responding to calls to check its state, attaching persistent storage, and
terminating it.
**Related Flags**
:instances_path: Where instances are kept on disk
:base_dir_name: Where cached images are stored under instances_path
:compute_driver: Name of class that is used to handle virtualization, loaded
by :func:`nova.openstack.common.importutils.import_object`
"""
import contextlib
import functools
import socket
import sys
import time
import traceback
from eventlet import greenthread
from nova import block_device
from nova import compute
from nova.compute import instance_types
from nova.compute import power_state
from nova.compute import resource_tracker
from nova.compute import rpcapi as compute_rpcapi
from nova.compute import task_states
from nova.compute import utils as compute_utils
from nova.compute import vm_states
import nova.context
from nova import exception
from nova import flags
from nova.image import glance
from nova import manager
from nova import network
from nova.network import model as network_model
from nova import notifications
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.openstack.common.notifier import api as notifier
from nova.openstack.common import rpc
from nova.openstack.common.rpc import common as rpc_common
from nova.openstack.common.rpc import dispatcher as rpc_dispatcher
from nova.openstack.common import timeutils
from nova import quota
from nova.scheduler import rpcapi as scheduler_rpcapi
from nova import utils
from nova.virt import driver
from nova import volume
compute_opts = [
cfg.StrOpt('instances_path',
default='$state_path/instances',
help='where instances are stored on disk'),
cfg.StrOpt('base_dir_name',
default='_base',
help="Where cached images are stored under $instances_path."
"This is NOT the full path - just a folder name."
"For per-compute-host cached images, set to _base_$my_ip"),
cfg.StrOpt('compute_driver',
default='nova.virt.connection.get_connection',
help='Driver to use for controlling virtualization. Options '
'include: libvirt.LibvirtDriver, xenapi.XenAPIDriver, '
'fake.FakeDriver, baremetal.BareMetalDriver, '
'vmwareapi.VMWareESXDriver'),
cfg.StrOpt('console_host',
default=socket.gethostname(),
help='Console proxy host to use to connect '
'to instances on this host.'),
cfg.IntOpt('live_migration_retry_count',
default=30,
help="Number of 1 second retries needed in live_migration"),
cfg.IntOpt("reboot_timeout",
default=0,
help="Automatically hard reboot an instance if it has been "
"stuck in a rebooting state longer than N seconds. "
"Set to 0 to disable."),
cfg.IntOpt("instance_build_timeout",
default=0,
help="Amount of time in seconds an instance can be in BUILD "
"before going into ERROR status."
"Set to 0 to disable."),
cfg.IntOpt("rescue_timeout",
default=0,
help="Automatically unrescue an instance after N seconds. "
"Set to 0 to disable."),
cfg.IntOpt("resize_confirm_window",
default=0,
help="Automatically confirm resizes after N seconds. "
"Set to 0 to disable."),
cfg.IntOpt('host_state_interval',
default=120,
help='Interval in seconds for querying the host status'),
cfg.IntOpt("running_deleted_instance_timeout",
default=0,
help="Number of seconds after being deleted when a running "
"instance should be considered eligible for cleanup."),
cfg.IntOpt("running_deleted_instance_poll_interval",
default=30,
help="Number of periodic scheduler ticks to wait between "
"runs of the cleanup task."),
cfg.StrOpt("running_deleted_instance_action",
default="log",
help="Action to take if a running deleted instance is detected."
"Valid options are 'noop', 'log' and 'reap'. "
"Set to 'noop' to disable."),
cfg.IntOpt("image_cache_manager_interval",
default=40,
help="Number of periodic scheduler ticks to wait between "
"runs of the image cache manager."),
cfg.IntOpt("heal_instance_info_cache_interval",
default=60,
help="Number of seconds between instance info_cache self "
"healing updates"),
cfg.BoolOpt('instance_usage_audit',
default=False,
help="Generate periodic compute.instance.exists notifications"),
]
FLAGS = flags.FLAGS
FLAGS.register_opts(compute_opts)
QUOTAS = quota.QUOTAS
LOG = logging.getLogger(__name__)
def publisher_id(host=None):
return notifier.publisher_id("compute", host)
def reverts_task_state(function):
"""Decorator to revert task_state on failure"""
@functools.wraps(function)
def decorated_function(self, context, *args, **kwargs):
try:
return function(self, context, *args, **kwargs)
except exception.UnexpectedTaskStateError:
LOG.exception(_("Possibly task preempted."))
# Note(maoy): unexpected task state means the current
# task is preempted. Do not clear task state in this
# case.
raise
except Exception:
with excutils.save_and_reraise_exception():
try:
self._instance_update(context,
kwargs['instance']['uuid'],
task_state=None)
except Exception:
pass
return decorated_function
def wrap_instance_fault(function):
"""Wraps a method to catch exceptions related to instances.
This decorator wraps a method to catch any exceptions having to do with
an instance that may get thrown. It then logs an instance fault in the db.
"""
@functools.wraps(function)
def decorated_function(self, context, *args, **kwargs):
try:
return function(self, context, *args, **kwargs)
except exception.InstanceNotFound:
raise
except Exception, e:
with excutils.save_and_reraise_exception():
compute_utils.add_instance_fault_from_exc(context,
kwargs['instance']['uuid'], e, sys.exc_info())
return decorated_function
def _get_image_meta(context, image_ref):
image_service, image_id = glance.get_remote_image_service(context,
image_ref)
return image_service.show(context, image_id)
class ComputeManager(manager.SchedulerDependentManager):
"""Manages the running instances from creation to destruction."""
RPC_API_VERSION = '2.2'
def __init__(self, compute_driver=None, *args, **kwargs):
"""Load configuration options and connect to the hypervisor."""
# TODO(vish): sync driver creation logic with the rest of the system
# and re-document the module docstring
if not compute_driver:
compute_driver = FLAGS.compute_driver
LOG.info(_("Loading compute driver '%s'") % compute_driver)
try:
self.driver = utils.check_isinstance(
importutils.import_object_ns('nova.virt', compute_driver),
driver.ComputeDriver)
except ImportError as e:
LOG.error(_("Unable to load the virtualization driver: %s") % (e))
sys.exit(1)
self.network_api = network.API()
self.volume_api = volume.API()
self.network_manager = importutils.import_object(
FLAGS.network_manager, host=kwargs.get('host', None))
self._last_host_check = 0
self._last_bw_usage_poll = 0
self._last_info_cache_heal = 0
self.compute_api = compute.API()
self.compute_rpcapi = compute_rpcapi.ComputeAPI()
self.scheduler_rpcapi = scheduler_rpcapi.SchedulerAPI()
super(ComputeManager, self).__init__(service_name="compute",
*args, **kwargs)
self.resource_tracker = resource_tracker.ResourceTracker(self.host,
self.driver)
def _instance_update(self, context, instance_uuid, **kwargs):
"""Update an instance in the database using kwargs as value."""
(old_ref, instance_ref) = self.db.instance_update_and_get_original(
context, instance_uuid, kwargs)
self.resource_tracker.update_usage(context, instance_ref)
notifications.send_update(context, old_ref, instance_ref)
return instance_ref
def _set_instance_error_state(self, context, instance_uuid):
try:
self._instance_update(context, instance_uuid,
vm_state=vm_states.ERROR)
except exception.InstanceNotFound:
LOG.debug(_('Instance has been destroyed from under us while '
'trying to set it to ERROR'),
instance_uuid=instance_uuid)
def init_host(self):
"""Initialization for a standalone compute service."""
self.driver.init_host(host=self.host)
context = nova.context.get_admin_context()
instances = self.db.instance_get_all_by_host(context, self.host)
if FLAGS.defer_iptables_apply:
self.driver.filter_defer_apply_on()
try:
for count, instance in enumerate(instances):
db_state = instance['power_state']
drv_state = self._get_power_state(context, instance)
expect_running = (db_state == power_state.RUNNING and
drv_state != db_state)
LOG.debug(_('Current state is %(drv_state)s, state in DB is '
'%(db_state)s.'), locals(), instance=instance)
net_info = compute_utils.get_nw_info_for_instance(instance)
# We're calling plug_vifs to ensure bridge and iptables
# filters are present, calling it once is enough.
if count == 0:
legacy_net_info = self._legacy_nw_info(net_info)
self.driver.plug_vifs(instance, legacy_net_info)
if ((expect_running and FLAGS.resume_guests_state_on_host_boot)
or FLAGS.start_guests_on_host_boot):
LOG.info(
_('Rebooting instance after nova-compute restart.'),
locals(), instance=instance)
block_device_info = \
self._get_instance_volume_block_device_info(
context, instance['uuid'])
try:
self.driver.resume_state_on_host_boot(
context,
instance,
self._legacy_nw_info(net_info),
block_device_info)
except NotImplementedError:
LOG.warning(_('Hypervisor driver does not support '
'resume guests'), instance=instance)
elif drv_state == power_state.RUNNING:
# VMWareAPI drivers will raise an exception
try:
self.driver.ensure_filtering_rules_for_instance(
instance,
self._legacy_nw_info(net_info))
except NotImplementedError:
LOG.warning(_('Hypervisor driver does not support '
'firewall rules'), instance=instance)
finally:
if FLAGS.defer_iptables_apply:
self.driver.filter_defer_apply_off()
def _get_power_state(self, context, instance):
"""Retrieve the power state for the given instance."""
LOG.debug(_('Checking state'), instance=instance)
try:
return self.driver.get_info(instance)["state"]
except exception.NotFound:
return power_state.NOSTATE
def get_console_topic(self, context):
"""Retrieves the console host for a project on this host.
Currently this is just set in the flags for each compute host.
"""
#TODO(mdragon): perhaps make this variable by console_type?
return rpc.queue_get_for(context,
FLAGS.console_topic,
FLAGS.console_host)
def get_console_pool_info(self, context, console_type):
return self.driver.get_console_pool_info(console_type)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def refresh_security_group_rules(self, context, security_group_id):
"""Tell the virtualization driver to refresh security group rules.
Passes straight through to the virtualization driver.
"""
return self.driver.refresh_security_group_rules(security_group_id)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def refresh_security_group_members(self, context, security_group_id):
"""Tell the virtualization driver to refresh security group members.
Passes straight through to the virtualization driver.
"""
return self.driver.refresh_security_group_members(security_group_id)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def refresh_instance_security_rules(self, context, instance):
"""Tell the virtualization driver to refresh security rules for
an instance.
Passes straight through to the virtualization driver.
"""
return self.driver.refresh_instance_security_rules(instance)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def refresh_provider_fw_rules(self, context):
"""This call passes straight through to the virtualization driver."""
return self.driver.refresh_provider_fw_rules()
def _get_instance_nw_info(self, context, instance):
"""Get a list of dictionaries of network data of an instance."""
# get the network info from network
network_info = self.network_api.get_instance_nw_info(context,
instance)
return network_info
def _legacy_nw_info(self, network_info):
"""Converts the model nw_info object to legacy style"""
if self.driver.legacy_nwinfo():
network_info = network_info.legacy()
return network_info
def _setup_block_device_mapping(self, context, instance):
"""setup volumes for block device mapping"""
block_device_mapping = []
swap = None
ephemerals = []
for bdm in self.db.block_device_mapping_get_all_by_instance(
context, instance['uuid']):
LOG.debug(_('Setting up bdm %s'), bdm, instance=instance)
if bdm['no_device']:
continue
if bdm['virtual_name']:
virtual_name = bdm['virtual_name']
device_name = bdm['device_name']
assert block_device.is_swap_or_ephemeral(virtual_name)
if virtual_name == 'swap':
swap = {'device_name': device_name,
'swap_size': bdm['volume_size']}
elif block_device.is_ephemeral(virtual_name):
eph = {'num': block_device.ephemeral_num(virtual_name),
'virtual_name': virtual_name,
'device_name': device_name,
'size': bdm['volume_size']}
ephemerals.append(eph)
continue
if ((bdm['snapshot_id'] is not None) and
(bdm['volume_id'] is None)):
# TODO(yamahata): default name and description
snapshot = self.volume_api.get_snapshot(context,
bdm['snapshot_id'])
vol = self.volume_api.create(context, bdm['volume_size'],
'', '', snapshot)
# TODO(yamahata): creating volume simultaneously
# reduces creation time?
# TODO(yamahata): eliminate dumb polling
while True:
volume = self.volume_api.get(context, vol['id'])
if volume['status'] != 'creating':
break
greenthread.sleep(1)
self.db.block_device_mapping_update(
context, bdm['id'], {'volume_id': vol['id']})
bdm['volume_id'] = vol['id']
if bdm['volume_id'] is not None:
volume = self.volume_api.get(context, bdm['volume_id'])
self.volume_api.check_attach(context, volume)
cinfo = self._attach_volume_boot(context,
instance,
volume,
bdm['device_name'])
self.db.block_device_mapping_update(
context, bdm['id'],
{'connection_info': jsonutils.dumps(cinfo)})
bdmap = {'connection_info': cinfo,
'mount_device': bdm['device_name'],
'delete_on_termination': bdm['delete_on_termination']}
block_device_mapping.append(bdmap)
return {
'root_device_name': instance['root_device_name'],
'swap': swap,
'ephemerals': ephemerals,
'block_device_mapping': block_device_mapping
}
def _run_instance(self, context, request_spec,
filter_properties, requested_networks, injected_files,
admin_password, is_first_time, instance):
"""Launch a new instance with specified options."""
context = context.elevated()
try:
self._check_instance_not_already_created(context, instance)
image_meta = self._check_image_size(context, instance)
extra_usage_info = {"image_name": image_meta['name']}
self._start_building(context, instance)
self._notify_about_instance_usage(
context, instance, "create.start",
extra_usage_info=extra_usage_info)
network_info = self._allocate_network(context, instance,
requested_networks)
try:
limits = filter_properties.get('limits', {})
with self.resource_tracker.resource_claim(context, instance,
limits):
# Resources are available to build this instance here,
# mark it as belonging to this host:
self._instance_update(context, instance['uuid'],
host=self.host, launched_on=self.host)
block_device_info = self._prep_block_device(context,
instance)
instance = self._spawn(context, instance, image_meta,
network_info, block_device_info,
injected_files, admin_password)
except exception.InstanceNotFound:
raise # the instance got deleted during the spawn
except Exception:
# try to re-schedule instance:
self._reschedule_or_reraise(context, instance,
requested_networks, admin_password, injected_files,
is_first_time, request_spec, filter_properties)
else:
# Spawn success:
if (is_first_time and not instance['access_ip_v4']
and not instance['access_ip_v6']):
self._update_access_ip(context, instance, network_info)
self._notify_about_instance_usage(context, instance,
"create.end", network_info=network_info,
extra_usage_info=extra_usage_info)
except Exception:
with excutils.save_and_reraise_exception():
self._set_instance_error_state(context, instance['uuid'])
def _reschedule_or_reraise(self, context, instance, requested_networks,
admin_password, injected_files, is_first_time,
request_spec, filter_properties):
"""Try to re-schedule the build or re-raise the original build error to
error out the instance.
"""
type_, value, tb = sys.exc_info() # save original exception
rescheduled = False
instance_uuid = instance['uuid']
def _log_original_error():
LOG.error(_('Build error: %s') %
traceback.format_exception(type_, value, tb),
instance_uuid=instance_uuid)
try:
self._deallocate_network(context, instance)
except Exception:
# do not attempt retry if network de-allocation occurs:
_log_original_error()
raise
try:
rescheduled = self._reschedule(context, instance_uuid,
requested_networks, admin_password, injected_files,
is_first_time, request_spec, filter_properties)
except Exception:
rescheduled = False
LOG.exception(_("Error trying to reschedule"),
instance_uuid=instance_uuid)
if rescheduled:
# log the original build error
_log_original_error()
else:
# not re-scheduling
raise type_, value, tb
def _reschedule(self, context, instance_uuid, requested_networks,
admin_password, injected_files, is_first_time, request_spec,
filter_properties):
retry = filter_properties.get('retry', None)
if not retry:
# no retry information, do not reschedule.
LOG.debug(_("Retry info not present, will not reschedule"),
instance_uuid=instance_uuid)
return
if not request_spec:
LOG.debug(_("No request spec, will not reschedule"),
instance_uuid=instance_uuid)
return
request_spec['instance_uuids'] = [instance_uuid]
LOG.debug(_("Re-scheduling instance: attempt %d"),
retry['num_attempts'], instance_uuid=instance_uuid)
# reset the task state:
self._instance_update(context, instance_uuid,
task_state=task_states.SCHEDULING)
self.scheduler_rpcapi.run_instance(context,
request_spec, admin_password, injected_files,
requested_networks, is_first_time, filter_properties)
return True
@manager.periodic_task
def _check_instance_build_time(self, context):
"""Ensure that instances are not stuck in build."""
timeout = FLAGS.instance_build_timeout
if timeout == 0:
return
filters = {'vm_state': vm_states.BUILDING}
building_insts = self.db.instance_get_all_by_filters(context, filters)
for instance in building_insts:
if timeutils.is_older_than(instance['created_at'], timeout):
self._set_instance_error_state(context, instance['uuid'])
LOG.warn(_("Instance build timed out. Set to error state."),
instance=instance)
def _update_access_ip(self, context, instance, nw_info):
"""Update the access ip values for a given instance.
If FLAGS.default_access_ip_network_name is set, this method will
grab the corresponding network and set the access ip values
accordingly. Note that when there are multiple ips to choose from,
an arbitrary one will be chosen.
"""
network_name = FLAGS.default_access_ip_network_name
if not network_name:
return
update_info = {}
for vif in nw_info:
if vif['network']['label'] == network_name:
for ip in vif.fixed_ips():
if ip['version'] == 4:
update_info['access_ip_v4'] = ip['address']
if ip['version'] == 6:
update_info['access_ip_v6'] = ip['address']
if update_info:
self.db.instance_update(context, instance.uuid, update_info)
notifications.send_update(context, instance, instance)
def _check_instance_not_already_created(self, context, instance):
"""Ensure an instance with the same name is not already present."""
if self.driver.instance_exists(instance['name']):
_msg = _("Instance has already been created")
raise exception.Invalid(_msg)
def _check_image_size(self, context, instance):
"""Ensure image is smaller than the maximum size allowed by the
instance_type.
The image stored in Glance is potentially compressed, so we use two
checks to ensure that the size isn't exceeded:
1) This one - checks compressed size, this a quick check to
eliminate any images which are obviously too large
2) Check uncompressed size in nova.virt.xenapi.vm_utils. This
is a slower check since it requires uncompressing the entire
image, but is accurate because it reflects the image's
actual size.
"""
image_meta = _get_image_meta(context, instance['image_ref'])
try:
size_bytes = image_meta['size']
except KeyError:
# Size is not a required field in the image service (yet), so
# we are unable to rely on it being there even though it's in
# glance.
# TODO(jk0): Should size be required in the image service?
return image_meta
instance_type_id = instance['instance_type_id']
instance_type = instance_types.get_instance_type(instance_type_id)
allowed_size_gb = instance_type['root_gb']
# NOTE(johannes): root_gb is allowed to be 0 for legacy reasons
# since libvirt interpreted the value differently than other
# drivers. A value of 0 means don't check size.
if not allowed_size_gb:
return image_meta
allowed_size_bytes = allowed_size_gb * 1024 * 1024 * 1024
image_id = image_meta['id']
LOG.debug(_("image_id=%(image_id)s, image_size_bytes="
"%(size_bytes)d, allowed_size_bytes="
"%(allowed_size_bytes)d") % locals(),
instance=instance)
if size_bytes > allowed_size_bytes:
LOG.info(_("Image '%(image_id)s' size %(size_bytes)d exceeded"
" instance_type allowed size "
"%(allowed_size_bytes)d")
% locals(), instance=instance)
raise exception.ImageTooLarge()
return image_meta
def _start_building(self, context, instance):
"""Save the host and launched_on fields and log appropriately."""
LOG.audit(_('Starting instance...'), context=context,
instance=instance)
self._instance_update(context, instance['uuid'],
vm_state=vm_states.BUILDING,
task_state=None,
expected_task_state=(task_states.SCHEDULING,
None))
def _allocate_network(self, context, instance, requested_networks):
"""Allocate networks for an instance and return the network info"""
self._instance_update(context, instance['uuid'],
vm_state=vm_states.BUILDING,
task_state=task_states.NETWORKING,
expected_task_state=None)
is_vpn = instance['image_ref'] == str(FLAGS.vpn_image_id)
try:
# allocate and get network info
network_info = self.network_api.allocate_for_instance(
context, instance, vpn=is_vpn,
requested_networks=requested_networks)
except Exception:
LOG.exception(_('Instance failed network setup'),
instance=instance)
raise
LOG.debug(_('Instance network_info: |%s|'), network_info,
instance=instance)
return network_info
def _prep_block_device(self, context, instance):
"""Set up the block device for an instance with error logging"""
self._instance_update(context, instance['uuid'],
vm_state=vm_states.BUILDING,
task_state=task_states.BLOCK_DEVICE_MAPPING)
try:
return self._setup_block_device_mapping(context, instance)
except Exception:
LOG.exception(_('Instance failed block device setup'),
instance=instance)
raise
def _spawn(self, context, instance, image_meta, network_info,
block_device_info, injected_files, admin_password):
"""Spawn an instance with error logging and update its power state"""
self._instance_update(context, instance['uuid'],
vm_state=vm_states.BUILDING,
task_state=task_states.SPAWNING,
expected_task_state=task_states.
BLOCK_DEVICE_MAPPING)
try:
self.driver.spawn(context, instance, image_meta,
injected_files, admin_password,
self._legacy_nw_info(network_info),
block_device_info)
except Exception:
LOG.exception(_('Instance failed to spawn'), instance=instance)
raise
current_power_state = self._get_power_state(context, instance)
return self._instance_update(context, instance['uuid'],
power_state=current_power_state,
vm_state=vm_states.ACTIVE,
task_state=None,
expected_task_state=task_states.SPAWNING,
launched_at=timeutils.utcnow())
def _notify_about_instance_usage(self, context, instance, event_suffix,
network_info=None, system_metadata=None,
extra_usage_info=None):
# NOTE(sirp): The only thing this wrapper function does extra is handle
# the passing in of `self.host`. Ordinarily this will just be
# `FLAGS.host`, but `Manager`'s gets a chance to override this in its
# `__init__`.
compute_utils.notify_about_instance_usage(
context, instance, event_suffix, network_info=network_info,
system_metadata=system_metadata,
extra_usage_info=extra_usage_info, host=self.host)
def _deallocate_network(self, context, instance):
LOG.debug(_('Deallocating network for instance'), instance=instance)
self.network_api.deallocate_for_instance(context, instance)
def _get_instance_volume_bdms(self, context, instance_uuid):
bdms = self.db.block_device_mapping_get_all_by_instance(context,
instance_uuid)
return [bdm for bdm in bdms if bdm['volume_id']]
def _get_instance_volume_bdm(self, context, instance_uuid, volume_id):
bdms = self._get_instance_volume_bdms(context, instance_uuid)
for bdm in bdms:
# NOTE(vish): Comparing as strings because the os_api doesn't
# convert to integer and we may wish to support uuids
# in the future.
if str(bdm['volume_id']) == str(volume_id):
return bdm
def _get_instance_volume_block_device_info(self, context, instance_uuid):
bdms = self._get_instance_volume_bdms(context, instance_uuid)
block_device_mapping = []
for bdm in bdms:
try:
cinfo = jsonutils.loads(bdm['connection_info'])
if cinfo and 'serial' not in cinfo:
cinfo['serial'] = bdm['volume_id']
bdmap = {'connection_info': cinfo,
'mount_device': bdm['device_name'],
'delete_on_termination': bdm['delete_on_termination']}
block_device_mapping.append(bdmap)
except TypeError:
# if the block_device_mapping has no value in connection_info
# (returned as None), don't include in the mapping
pass
# NOTE(vish): The mapping is passed in so the driver can disconnect
# from remote volumes if necessary
return {'block_device_mapping': block_device_mapping}
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def run_instance(self, context, instance, request_spec=None,
filter_properties=None, requested_networks=None,
injected_files=None, admin_password=None,
is_first_time=False):
if filter_properties is None:
filter_properties = {}
if injected_files is None:
injected_files = []
@utils.synchronized(instance['uuid'])
def do_run_instance():
self._run_instance(context, request_spec,
filter_properties, requested_networks, injected_files,
admin_password, is_first_time, instance)
do_run_instance()
def _shutdown_instance(self, context, instance):
"""Shutdown an instance on this host."""
context = context.elevated()
LOG.audit(_('%(action_str)s instance') % {'action_str': 'Terminating'},
context=context, instance=instance)
self._notify_about_instance_usage(context, instance, "shutdown.start")
# get network info before tearing down
try:
network_info = self._get_instance_nw_info(context, instance)
except exception.NetworkNotFound:
network_info = network_model.NetworkInfo()
# tear down allocated network structure
self._deallocate_network(context, instance)
# NOTE(vish) get bdms before destroying the instance
bdms = self._get_instance_volume_bdms(context, instance['uuid'])
block_device_info = self._get_instance_volume_block_device_info(
context, instance['uuid'])
self.driver.destroy(instance, self._legacy_nw_info(network_info),
block_device_info)
for bdm in bdms:
try:
# NOTE(vish): actual driver detach done in driver.destroy, so
# just tell nova-volume that we are done with it.
volume = self.volume_api.get(context, bdm['volume_id'])
connector = self.driver.get_volume_connector(instance)
self.volume_api.terminate_connection(context,
volume,
connector)
self.volume_api.detach(context, volume)
except exception.DiskNotFound as exc:
LOG.warn(_('Ignoring DiskNotFound: %s') % exc,
instance=instance)
except exception.VolumeNotFound as exc:
LOG.warn(_('Ignoring VolumeNotFound: %s') % exc,
instance=instance)
self._notify_about_instance_usage(context, instance, "shutdown.end")
def _cleanup_volumes(self, context, instance_uuid):
bdms = self.db.block_device_mapping_get_all_by_instance(context,
instance_uuid)
for bdm in bdms:
LOG.debug(_("terminating bdm %s") % bdm,
instance_uuid=instance_uuid)
if bdm['volume_id'] and bdm['delete_on_termination']:
volume = self.volume_api.get(context, bdm['volume_id'])
self.volume_api.delete(context, volume)
# NOTE(vish): bdms will be deleted on instance destroy
def _delete_instance(self, context, instance):
"""Delete an instance on this host."""
instance_uuid = instance['uuid']
self.db.instance_info_cache_delete(context, instance_uuid)
self._notify_about_instance_usage(context, instance, "delete.start")
self._shutdown_instance(context, instance)
self._cleanup_volumes(context, instance_uuid)
# if a delete task succeed, always update vm state and task state
# without expecting task state to be DELETING
instance = self._instance_update(context,
instance_uuid,
vm_state=vm_states.DELETED,
task_state=None,
terminated_at=timeutils.utcnow())
self.db.instance_destroy(context, instance_uuid)
system_meta = self.db.instance_system_metadata_get(context,
instance_uuid)
self._notify_about_instance_usage(context, instance, "delete.end",
system_metadata=system_meta)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@wrap_instance_fault
def terminate_instance(self, context, instance):
"""Terminate an instance on this host. """
# Note(eglynn): we do not decorate this action with reverts_task_state
# because a failure during termination should leave the task state as
# DELETING, as a signal to the API layer that a subsequent deletion
# attempt should not result in a further decrement of the quota_usages
# in_use count (see bug 1046236).
elevated = context.elevated()
@utils.synchronized(instance['uuid'])
def do_terminate_instance(instance):
try:
self._delete_instance(context, instance)
except exception.InstanceTerminationFailure as error:
msg = _('%s. Setting instance vm_state to ERROR')
LOG.error(msg % error, instance=instance)
self._set_instance_error_state(context, instance['uuid'])
except exception.InstanceNotFound as e:
LOG.warn(e, instance=instance)
do_terminate_instance(instance)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def stop_instance(self, context, instance):
"""Stopping an instance on this host.
Alias for power_off_instance for compatibility"""
self.power_off_instance(context, instance,
final_state=vm_states.STOPPED)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def start_instance(self, context, instance):
"""Starting an instance on this host.
Alias for power_on_instance for compatibility"""
self.power_on_instance(context, instance)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def power_off_instance(self, context, instance,
final_state=vm_states.SOFT_DELETED):
"""Power off an instance on this host."""
self._notify_about_instance_usage(context, instance, "power_off.start")
self.driver.power_off(instance)
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
power_state=current_power_state,
vm_state=final_state,
expected_task_state=(task_states.POWERING_OFF,
task_states.STOPPING),
task_state=None)
self._notify_about_instance_usage(context, instance, "power_off.end")
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def power_on_instance(self, context, instance):
"""Power on an instance on this host."""
self._notify_about_instance_usage(context, instance, "power_on.start")
self.driver.power_on(instance)
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
power_state=current_power_state,
vm_state=vm_states.ACTIVE,
task_state=None,
expected_task_state=(task_states.POWERING_ON,
task_states.STARTING))
self._notify_about_instance_usage(context, instance, "power_on.end")
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def rebuild_instance(self, context, instance, orig_image_ref, image_ref,
injected_files, new_pass, orig_sys_metadata=None):
"""Destroy and re-make this instance.
A 'rebuild' effectively purges all existing data from the system and
remakes the VM with given 'metadata' and 'personalities'.
:param context: `nova.RequestContext` object
:param instance: Instance dict
:param orig_image_ref: Original image_ref before rebuild
:param image_ref: New image_ref for rebuild
:param injected_files: Files to inject
:param new_pass: password to set on rebuilt instance
:param orig_sys_metadata: instance system metadata from pre-rebuild
"""
context = context.elevated()
with self._error_out_instance_on_exception(context, instance['uuid']):
LOG.audit(_("Rebuilding instance"), context=context,
instance=instance)
image_meta = _get_image_meta(context, image_ref)
# This instance.exists message should contain the original
# image_ref, not the new one. Since the DB has been updated
# to point to the new one... we have to override it.
orig_image_ref_url = utils.generate_image_url(orig_image_ref)
extra_usage_info = {'image_ref_url': orig_image_ref_url}
compute_utils.notify_usage_exists(context, instance,
current_period=True, system_metadata=orig_sys_metadata,
extra_usage_info=extra_usage_info)
# This message should contain the new image_ref
extra_usage_info = {'image_name': image_meta['name']}
self._notify_about_instance_usage(context, instance,
"rebuild.start", extra_usage_info=extra_usage_info)
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
power_state=current_power_state,
task_state=task_states.REBUILDING,
expected_task_state=task_states.REBUILDING)
network_info = self._get_instance_nw_info(context, instance)
self.driver.destroy(instance, self._legacy_nw_info(network_info))
instance = self._instance_update(context,
instance['uuid'],
task_state=task_states.
REBUILD_BLOCK_DEVICE_MAPPING,
expected_task_state=task_states.REBUILDING)
instance.injected_files = injected_files
network_info = self.network_api.get_instance_nw_info(context,
instance)
device_info = self._setup_block_device_mapping(context, instance)
instance = self._instance_update(context,
instance['uuid'],
task_state=task_states.
REBUILD_SPAWNING,
expected_task_state=task_states.
REBUILD_BLOCK_DEVICE_MAPPING)
# pull in new password here since the original password isn't in
# the db
admin_password = new_pass
self.driver.spawn(context, instance, image_meta,
[], admin_password,
self._legacy_nw_info(network_info),
device_info)
current_power_state = self._get_power_state(context, instance)
instance = self._instance_update(context,
instance['uuid'],
power_state=current_power_state,
vm_state=vm_states.ACTIVE,
task_state=None,
expected_task_state=task_states.
REBUILD_SPAWNING,
launched_at=timeutils.utcnow())
self._notify_about_instance_usage(
context, instance, "rebuild.end",
network_info=network_info,
extra_usage_info=extra_usage_info)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def reboot_instance(self, context, instance, reboot_type="SOFT"):
"""Reboot an instance on this host."""
context = context.elevated()
LOG.audit(_("Rebooting instance"), context=context, instance=instance)
self._notify_about_instance_usage(context, instance, "reboot.start")
current_power_state = self._get_power_state(context, instance)
self._instance_update(context, instance['uuid'],
power_state=current_power_state,
vm_state=vm_states.ACTIVE)
if instance['power_state'] != power_state.RUNNING:
state = instance['power_state']
running = power_state.RUNNING
LOG.warn(_('trying to reboot a non-running '
'instance: (state: %(state)s '
'expected: %(running)s)') % locals(),
context=context, instance=instance)
network_info = self._get_instance_nw_info(context, instance)
block_device_info = self._get_instance_volume_block_device_info(
context, instance['uuid'])
try:
self.driver.reboot(instance, self._legacy_nw_info(network_info),
reboot_type, block_device_info)
except Exception, exc:
LOG.error(_('Cannot reboot instance: %(exc)s'), locals(),
context=context, instance=instance)
compute_utils.add_instance_fault_from_exc(context,
instance['uuid'], exc, sys.exc_info())
# Fall through and reset task_state to None
current_power_state = self._get_power_state(context, instance)
self._instance_update(context, instance['uuid'],
power_state=current_power_state,
vm_state=vm_states.ACTIVE,
task_state=None)
self._notify_about_instance_usage(context, instance, "reboot.end")
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def snapshot_instance(self, context, image_id, instance,
image_type='snapshot', backup_type=None,
rotation=None):
"""Snapshot an instance on this host.
:param context: security context
:param instance: an Instance dict
:param image_id: glance.db.sqlalchemy.models.Image.Id
:param image_type: snapshot | backup
:param backup_type: daily | weekly
:param rotation: int representing how many backups to keep around;
None if rotation shouldn't be used (as in the case of snapshots)
"""
context = context.elevated()
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
power_state=current_power_state)
LOG.audit(_('instance snapshotting'), context=context,
instance=instance)
if instance['power_state'] != power_state.RUNNING:
state = instance['power_state']
running = power_state.RUNNING
LOG.warn(_('trying to snapshot a non-running '
'instance: (state: %(state)s '
'expected: %(running)s)') % locals(),
instance=instance)
self._notify_about_instance_usage(
context, instance, "snapshot.start")
self.driver.snapshot(context, instance, image_id)
if image_type == 'snapshot':
expected_task_state = task_states.IMAGE_SNAPSHOT
elif image_type == 'backup':
expected_task_state = task_states.IMAGE_BACKUP
self._instance_update(context, instance['uuid'], task_state=None,
expected_task_state=expected_task_state)
if image_type == 'snapshot' and rotation:
raise exception.ImageRotationNotAllowed()
elif image_type == 'backup' and rotation:
self._rotate_backups(context, instance, backup_type, rotation)
elif image_type == 'backup':
raise exception.RotationRequiredForBackup()
self._notify_about_instance_usage(
context, instance, "snapshot.end")
@wrap_instance_fault
def _rotate_backups(self, context, instance, backup_type, rotation):
"""Delete excess backups associated to an instance.
Instances are allowed a fixed number of backups (the rotation number);
this method deletes the oldest backups that exceed the rotation
threshold.
:param context: security context
:param instance: Instance dict
:param backup_type: daily | weekly
:param rotation: int representing how many backups to keep around;
None if rotation shouldn't be used (as in the case of snapshots)
"""
# NOTE(jk0): Eventually extract this out to the ImageService?
def fetch_images():
images = []
marker = None
while True:
batch = image_service.detail(context, filters=filters,
marker=marker, sort_key='created_at', sort_dir='desc')
if not batch:
break
images += batch
marker = batch[-1]['id']
return images
image_service = glance.get_default_image_service()
filters = {'property-image_type': 'backup',
'property-backup_type': backup_type,
'property-instance_uuid': instance['uuid']}
images = fetch_images()
num_images = len(images)
LOG.debug(_("Found %(num_images)d images (rotation: %(rotation)d)")
% locals(), instance=instance)
if num_images > rotation:
# NOTE(sirp): this deletes all backups that exceed the rotation
# limit
excess = len(images) - rotation
LOG.debug(_("Rotating out %d backups") % excess,
instance=instance)
for i in xrange(excess):
image = images.pop()
image_id = image['id']
LOG.debug(_("Deleting image %s") % image_id,
instance=instance)
image_service.delete(context, image_id)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def set_admin_password(self, context, instance, new_pass=None):
"""Set the root/admin password for an instance on this host.
This is generally only called by API password resets after an
image has been built.
"""
context = context.elevated()
if new_pass is None:
# Generate a random password
new_pass = utils.generate_password(FLAGS.password_length)
max_tries = 10
for i in xrange(max_tries):
current_power_state = self._get_power_state(context, instance)
expected_state = power_state.RUNNING
if current_power_state != expected_state:
self._instance_update(context, instance['uuid'],
task_state=None,
expected_task_state=task_states.
UPDATING_PASSWORD)
_msg = _('Failed to set admin password. Instance %s is not'
' running') % instance["uuid"]
raise exception.InstancePasswordSetFailed(
instance=instance['uuid'], reason=_msg)
else:
try:
self.driver.set_admin_password(instance, new_pass)
LOG.audit(_("Root password set"), instance=instance)
self._instance_update(context,
instance['uuid'],
task_state=None,
expected_task_state=task_states.
UPDATING_PASSWORD)
break
except NotImplementedError:
# NOTE(dprince): if the driver doesn't implement
# set_admin_password we break to avoid a loop
_msg = _('set_admin_password is not implemented '
'by this driver.')
LOG.warn(_msg, instance=instance)
self._instance_update(context,
instance['uuid'],
task_state=None,
expected_task_state=task_states.
UPDATING_PASSWORD)
raise exception.InstancePasswordSetFailed(
instance=instance['uuid'], reason=_msg)
except exception.UnexpectedTaskStateError:
# interrupted by another (most likely delete) task
# do not retry
raise
except Exception, e:
# Catch all here because this could be anything.
LOG.exception(_('set_admin_password failed: %s') % e,
instance=instance)
if i == max_tries - 1:
self._set_instance_error_state(context,
instance['uuid'])
# We create a new exception here so that we won't
# potentially reveal password information to the
# API caller. The real exception is logged above
_msg = _('error setting admin password')
raise exception.InstancePasswordSetFailed(
instance=instance['uuid'], reason=_msg)
time.sleep(1)
continue
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def inject_file(self, context, path, file_contents, instance):
"""Write a file to the specified path in an instance on this host."""
context = context.elevated()
current_power_state = self._get_power_state(context, instance)
expected_state = power_state.RUNNING
if current_power_state != expected_state:
LOG.warn(_('trying to inject a file into a non-running '
'(state: %(current_power_state)s '
'expected: %(expected_state)s)') % locals(),
instance=instance)
LOG.audit(_('injecting file to %(path)s') % locals(),
instance=instance)
self.driver.inject_file(instance, path, file_contents)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def rescue_instance(self, context, instance, rescue_password=None):
"""
Rescue an instance on this host.
:param rescue_password: password to set on rescue instance
"""
context = context.elevated()
LOG.audit(_('Rescuing'), context=context, instance=instance)
admin_password = (rescue_password if rescue_password else
utils.generate_password(FLAGS.password_length))
network_info = self._get_instance_nw_info(context, instance)
image_meta = _get_image_meta(context, instance['image_ref'])
with self._error_out_instance_on_exception(context, instance['uuid']):
self.driver.rescue(context, instance,
self._legacy_nw_info(network_info), image_meta,
admin_password)
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
vm_state=vm_states.RESCUED,
task_state=None,
power_state=current_power_state,
expected_task_state=task_states.RESCUING)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def unrescue_instance(self, context, instance):
"""Rescue an instance on this host."""
context = context.elevated()
LOG.audit(_('Unrescuing'), context=context, instance=instance)
network_info = self._get_instance_nw_info(context, instance)
with self._error_out_instance_on_exception(context, instance['uuid']):
self.driver.unrescue(instance,
self._legacy_nw_info(network_info))
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
vm_state=vm_states.ACTIVE,
task_state=None,
expected_task_state=task_states.UNRESCUING,
power_state=current_power_state)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def change_instance_metadata(self, context, diff, instance):
"""Update the metadata published to the instance."""
LOG.debug(_("Changing instance metadata according to %(diff)r") %
locals(), instance=instance)
self.driver.change_instance_metadata(context, instance, diff)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@wrap_instance_fault
def confirm_resize(self, context, migration_id, instance,
reservations=None):
"""Destroys the source instance."""
migration_ref = self.db.migration_get(context, migration_id)
self._notify_about_instance_usage(context, instance,
"resize.confirm.start")
with self._error_out_instance_on_exception(context, instance['uuid'],
reservations):
# NOTE(tr3buchet): tear down networks on source host
self.network_api.setup_networks_on_host(context, instance,
migration_ref['source_compute'], teardown=True)
network_info = self._get_instance_nw_info(context, instance)
self.driver.confirm_migration(migration_ref, instance,
self._legacy_nw_info(network_info))
self._notify_about_instance_usage(
context, instance, "resize.confirm.end",
network_info=network_info)
self._quota_commit(context, reservations)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def revert_resize(self, context, instance, migration_id,
reservations=None):
"""Destroys the new instance on the destination machine.
Reverts the model changes, and powers on the old instance on the
source machine.
"""
migration_ref = self.db.migration_get(context, migration_id)
with self._error_out_instance_on_exception(context, instance['uuid'],
reservations):
# NOTE(tr3buchet): tear down networks on destination host
self.network_api.setup_networks_on_host(context, instance,
teardown=True)
network_info = self._get_instance_nw_info(context, instance)
self.driver.destroy(instance, self._legacy_nw_info(network_info))
self.compute_rpcapi.finish_revert_resize(context, instance,
migration_ref['id'], migration_ref['source_compute'],
reservations)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def finish_revert_resize(self, context, migration_id, instance,
reservations=None):
"""Finishes the second half of reverting a resize.
Power back on the source instance and revert the resized attributes
in the database.
"""
migration_ref = self.db.migration_get(context, migration_id)
with self._error_out_instance_on_exception(context, instance['uuid'],
reservations):
network_info = self._get_instance_nw_info(context, instance)
self._notify_about_instance_usage(
context, instance, "resize.revert.start")
old_instance_type = migration_ref['old_instance_type_id']
instance_type = instance_types.get_instance_type(old_instance_type)
block_device_info = self._get_instance_volume_block_device_info(
context, instance['uuid'])
self.driver.finish_revert_migration(instance,
self._legacy_nw_info(network_info),
block_device_info)
# Just roll back the record. There's no need to resize down since
# the 'old' VM already has the preferred attributes
self._instance_update(context,
instance['uuid'],
memory_mb=instance_type['memory_mb'],
host=migration_ref['source_compute'],
vcpus=instance_type['vcpus'],
root_gb=instance_type['root_gb'],
ephemeral_gb=instance_type['ephemeral_gb'],
instance_type_id=instance_type['id'],
launched_at=timeutils.utcnow(),
vm_state=vm_states.ACTIVE,
task_state=None,
expected_task_state=task_states.
RESIZE_REVERTING)
self.db.migration_update(context, migration_id,
{'status': 'reverted'})
self._notify_about_instance_usage(
context, instance, "resize.revert.end")
self._quota_commit(context, reservations)
@staticmethod
def _quota_commit(context, reservations):
if reservations:
QUOTAS.commit(context, reservations)
@staticmethod
def _quota_rollback(context, reservations):
if reservations:
QUOTAS.rollback(context, reservations)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def prep_resize(self, context, image, instance, instance_type,
reservations=None):
"""Initiates the process of moving a running instance to another host.
Possibly changes the RAM and disk size in the process.
"""
context = context.elevated()
with self._error_out_instance_on_exception(context, instance['uuid'],
reservations):
compute_utils.notify_usage_exists(
context, instance, current_period=True)
self._notify_about_instance_usage(
context, instance, "resize.prep.start")
same_host = instance['host'] == self.host
if same_host and not FLAGS.allow_resize_to_same_host:
self._set_instance_error_state(context, instance['uuid'])
msg = _('destination same as source!')
raise exception.MigrationError(msg)
# TODO(russellb): no-db-compute: Send the old instance type info
# that is needed via rpc so db access isn't required here.
old_instance_type_id = instance['instance_type_id']
old_instance_type = instance_types.get_instance_type(
old_instance_type_id)
migration_ref = self.db.migration_create(context,
{'instance_uuid': instance['uuid'],
'source_compute': instance['host'],
'dest_compute': self.host,
'dest_host': self.driver.get_host_ip_addr(),
'old_instance_type_id': old_instance_type['id'],
'new_instance_type_id': instance_type['id'],
'status': 'pre-migrating'})
LOG.audit(_('Migrating'), context=context, instance=instance)
self.compute_rpcapi.resize_instance(context, instance,
migration_ref['id'], image, reservations)
extra_usage_info = dict(
new_instance_type=instance_type['name'],
new_instance_type_id=instance_type['id'])
self._notify_about_instance_usage(
context, instance, "resize.prep.end",
extra_usage_info=extra_usage_info)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def resize_instance(self, context, instance,
migration_id, image, reservations=None):
"""Starts the migration of a running instance to another host."""
migration_ref = self.db.migration_get(context, migration_id)
with self._error_out_instance_on_exception(context, instance['uuid'],
reservations):
instance_type_ref = self.db.instance_type_get(context,
migration_ref.new_instance_type_id)
network_info = self._get_instance_nw_info(context, instance)
self.db.migration_update(context,
migration_id,
{'status': 'migrating'})
self._instance_update(context, instance['uuid'],
task_state=task_states.RESIZE_MIGRATING,
expected_task_state=task_states.RESIZE_PREP)
self._notify_about_instance_usage(
context, instance, "resize.start", network_info=network_info)
block_device_info = self._get_instance_volume_block_device_info(
context, instance['uuid'])
disk_info = self.driver.migrate_disk_and_power_off(
context, instance, migration_ref['dest_host'],
instance_type_ref, self._legacy_nw_info(network_info),
block_device_info)
self.db.migration_update(context,
migration_id,
{'status': 'post-migrating'})
self._instance_update(context, instance['uuid'],
task_state=task_states.RESIZE_MIGRATED,
expected_task_state=task_states.
RESIZE_MIGRATING)
self.compute_rpcapi.finish_resize(context, instance, migration_id,
image, disk_info, migration_ref['dest_compute'], reservations)
self._notify_about_instance_usage(context, instance, "resize.end",
network_info=network_info)
def _finish_resize(self, context, instance, migration_ref, disk_info,
image):
resize_instance = False
old_instance_type_id = migration_ref['old_instance_type_id']
new_instance_type_id = migration_ref['new_instance_type_id']
if old_instance_type_id != new_instance_type_id:
instance_type = instance_types.get_instance_type(
new_instance_type_id)
instance = self._instance_update(
context,
instance['uuid'],
instance_type_id=instance_type['id'],
memory_mb=instance_type['memory_mb'],
vcpus=instance_type['vcpus'],
root_gb=instance_type['root_gb'],
ephemeral_gb=instance_type['ephemeral_gb'])
resize_instance = True
# NOTE(tr3buchet): setup networks on destination host
self.network_api.setup_networks_on_host(context, instance,
migration_ref['dest_compute'])
network_info = self._get_instance_nw_info(context, instance)
self._instance_update(context, instance['uuid'],
task_state=task_states.RESIZE_FINISH,
expected_task_state=task_states.RESIZE_MIGRATED)
self._notify_about_instance_usage(
context, instance, "finish_resize.start",
network_info=network_info)
block_device_info = self._get_instance_volume_block_device_info(
context, instance['uuid'])
self.driver.finish_migration(context, migration_ref, instance,
disk_info,
self._legacy_nw_info(network_info),
image, resize_instance,
block_device_info)
instance = self._instance_update(context,
instance['uuid'],
vm_state=vm_states.RESIZED,
host=migration_ref['dest_compute'],
launched_at=timeutils.utcnow(),
task_state=None,
expected_task_state=task_states.
RESIZE_FINISH)
self.db.migration_update(context, migration_ref.id,
{'status': 'finished'})
self._notify_about_instance_usage(
context, instance, "finish_resize.end",
network_info=network_info)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def finish_resize(self, context, migration_id, disk_info, image,
instance, reservations=None):
"""Completes the migration process.
Sets up the newly transferred disk and turns on the instance at its
new host machine.
"""
migration_ref = self.db.migration_get(context, migration_id)
try:
self._finish_resize(context, instance, migration_ref,
disk_info, image)
self._quota_commit(context, reservations)
except Exception, error:
self._quota_rollback(context, reservations)
with excutils.save_and_reraise_exception():
LOG.error(_('%s. Setting instance vm_state to ERROR') % error,
instance=instance)
self._set_instance_error_state(context, instance['uuid'])
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def add_fixed_ip_to_instance(self, context, network_id, instance):
"""Calls network_api to add new fixed_ip to instance
then injects the new network info and resets instance networking.
"""
self._notify_about_instance_usage(
context, instance, "create_ip.start")
self.network_api.add_fixed_ip_to_instance(context,
instance,
network_id)
network_info = self._inject_network_info(context, instance=instance)
self.reset_network(context, instance)
self._notify_about_instance_usage(
context, instance, "create_ip.end", network_info=network_info)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def remove_fixed_ip_from_instance(self, context, address, instance):
"""Calls network_api to remove existing fixed_ip from instance
by injecting the altered network info and resetting
instance networking.
"""
self._notify_about_instance_usage(
context, instance, "delete_ip.start")
self.network_api.remove_fixed_ip_from_instance(context,
instance,
address)
network_info = self._inject_network_info(context,
instance=instance)
self.reset_network(context, instance)
self._notify_about_instance_usage(
context, instance, "delete_ip.end", network_info=network_info)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def pause_instance(self, context, instance):
"""Pause an instance on this host."""
context = context.elevated()
LOG.audit(_('Pausing'), context=context, instance=instance)
self.driver.pause(instance)
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
power_state=current_power_state,
vm_state=vm_states.PAUSED,
task_state=None,
expected_task_state=task_states.PAUSING)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def unpause_instance(self, context, instance):
"""Unpause a paused instance on this host."""
context = context.elevated()
LOG.audit(_('Unpausing'), context=context, instance=instance)
self.driver.unpause(instance)
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
power_state=current_power_state,
vm_state=vm_states.ACTIVE,
task_state=None,
expected_task_state=task_states.UNPAUSING)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def host_power_action(self, context, host=None, action=None):
"""Reboots, shuts down or powers up the host."""
return self.driver.host_power_action(host, action)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def host_maintenance_mode(self, context, host, mode):
"""Start/Stop host maintenance window. On start, it triggers
guest VMs evacuation."""
return self.driver.host_maintenance_mode(host, mode)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def set_host_enabled(self, context, host=None, enabled=None):
"""Sets the specified host's ability to accept new instances."""
return self.driver.set_host_enabled(host, enabled)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def get_host_uptime(self, context, host):
"""Returns the result of calling "uptime" on the target host."""
return self.driver.get_host_uptime(host)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@wrap_instance_fault
def get_diagnostics(self, context, instance):
"""Retrieve diagnostics for an instance on this host."""
current_power_state = self._get_power_state(context, instance)
if current_power_state == power_state.RUNNING:
LOG.audit(_("Retrieving diagnostics"), context=context,
instance=instance)
return self.driver.get_diagnostics(instance)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def suspend_instance(self, context, instance):
"""Suspend the given instance."""
context = context.elevated()
with self._error_out_instance_on_exception(context, instance['uuid']):
self.driver.suspend(instance)
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
power_state=current_power_state,
vm_state=vm_states.SUSPENDED,
task_state=None,
expected_task_state=task_states.SUSPENDING)
self._notify_about_instance_usage(context, instance, 'suspend')
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def resume_instance(self, context, instance):
"""Resume the given suspended instance."""
context = context.elevated()
LOG.audit(_('Resuming'), context=context, instance=instance)
self.driver.resume(instance)
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
power_state=current_power_state,
vm_state=vm_states.ACTIVE,
task_state=None)
self._notify_about_instance_usage(context, instance, 'resume')
@reverts_task_state
@wrap_instance_fault
def reset_network(self, context, instance):
"""Reset networking on the given instance."""
LOG.debug(_('Reset network'), context=context, instance=instance)
self.driver.reset_network(instance)
def _inject_network_info(self, context, instance):
"""Inject network info for the given instance."""
LOG.debug(_('Inject network info'), context=context, instance=instance)
network_info = self._get_instance_nw_info(context, instance)
LOG.debug(_('network_info to inject: |%s|'), network_info,
instance=instance)
self.driver.inject_network_info(instance,
self._legacy_nw_info(network_info))
return network_info
@wrap_instance_fault
def inject_network_info(self, context, instance):
"""Inject network info, but don't return the info."""
self._inject_network_info(context, instance)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@wrap_instance_fault
def get_console_output(self, context, instance, tail_length=None):
"""Send the console output for the given instance."""
context = context.elevated()
LOG.audit(_("Get console output"), context=context,
instance=instance)
output = self.driver.get_console_output(instance)
if tail_length is not None:
output = self._tail_log(output, tail_length)
return output.decode('utf-8', 'replace').encode('ascii', 'replace')
def _tail_log(self, log, length):
try:
length = int(length)
except ValueError:
length = 0
if length == 0:
return ''
else:
return '\n'.join(log.split('\n')[-int(length):])
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@wrap_instance_fault
def get_vnc_console(self, context, console_type, instance):
"""Return connection information for a vnc console."""
context = context.elevated()
LOG.debug(_("Getting vnc console"), instance=instance)
token = str(utils.gen_uuid())
if console_type == 'novnc':
# For essex, novncproxy_base_url must include the full path
# including the html file (like http://myhost/vnc_auto.html)
access_url = '%s?token=%s' % (FLAGS.novncproxy_base_url, token)
elif console_type == 'xvpvnc':
access_url = '%s?token=%s' % (FLAGS.xvpvncproxy_base_url, token)
else:
raise exception.ConsoleTypeInvalid(console_type=console_type)
# Retrieve connect info from driver, and then decorate with our
# access info token
connect_info = self.driver.get_vnc_console(instance)
connect_info['token'] = token
connect_info['access_url'] = access_url
return connect_info
def _attach_volume_boot(self, context, instance, volume, mountpoint):
"""Attach a volume to an instance at boot time. So actual attach
is done by instance creation"""
instance_id = instance['id']
instance_uuid = instance['uuid']
volume_id = volume['id']
context = context.elevated()
LOG.audit(_('Booting with volume %(volume_id)s at %(mountpoint)s'),
locals(), context=context, instance=instance)
connector = self.driver.get_volume_connector(instance)
connection_info = self.volume_api.initialize_connection(context,
volume,
connector)
self.volume_api.attach(context, volume, instance_uuid, mountpoint)
return connection_info
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def reserve_block_device_name(self, context, instance, device):
@utils.synchronized(instance['uuid'])
def do_reserve():
result = compute_utils.get_device_name_for_instance(context,
instance,
device)
# NOTE(vish): create bdm here to avoid race condition
values = {'instance_uuid': instance['uuid'],
'device_name': result}
self.db.block_device_mapping_create(context, values)
return result
return do_reserve()
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def attach_volume(self, context, volume_id, mountpoint, instance):
"""Attach a volume to an instance."""
try:
return self._attach_volume(context, volume_id,
mountpoint, instance)
except Exception:
with excutils.save_and_reraise_exception():
self.db.block_device_mapping_destroy_by_instance_and_device(
context, instance.get('uuid'), mountpoint)
def _attach_volume(self, context, volume_id, mountpoint, instance):
volume = self.volume_api.get(context, volume_id)
context = context.elevated()
LOG.audit(_('Attaching volume %(volume_id)s to %(mountpoint)s'),
locals(), context=context, instance=instance)
try:
connector = self.driver.get_volume_connector(instance)
connection_info = self.volume_api.initialize_connection(context,
volume,
connector)
except Exception: # pylint: disable=W0702
with excutils.save_and_reraise_exception():
msg = _("Failed to connect to volume %(volume_id)s "
"while attaching at %(mountpoint)s")
LOG.exception(msg % locals(), context=context,
instance=instance)
self.volume_api.unreserve_volume(context, volume)
if 'serial' not in connection_info:
connection_info['serial'] = volume_id
try:
self.driver.attach_volume(connection_info,
instance['name'],
mountpoint)
except Exception: # pylint: disable=W0702
with excutils.save_and_reraise_exception():
msg = _("Failed to attach volume %(volume_id)s "
"at %(mountpoint)s")
LOG.exception(msg % locals(), context=context,
instance=instance)
self.volume_api.terminate_connection(context,
volume,
connector)
self.volume_api.attach(context,
volume,
instance['uuid'],
mountpoint)
values = {
'instance_uuid': instance['uuid'],
'connection_info': jsonutils.dumps(connection_info),
'device_name': mountpoint,
'delete_on_termination': False,
'virtual_name': None,
'snapshot_id': None,
'volume_id': volume_id,
'volume_size': None,
'no_device': None}
self.db.block_device_mapping_update_or_create(context, values)
def _detach_volume(self, context, instance, bdm):
"""Do the actual driver detach using block device mapping."""
mp = bdm['device_name']
volume_id = bdm['volume_id']
LOG.audit(_('Detach volume %(volume_id)s from mountpoint %(mp)s'),
locals(), context=context, instance=instance)
if instance['name'] not in self.driver.list_instances():
LOG.warn(_('Detaching volume from unknown instance'),
context=context, instance=instance)
connection_info = jsonutils.loads(bdm['connection_info'])
# NOTE(vish): We currently don't use the serial when disconnecting,
# but added for completeness in case we ever do.
if connection_info and 'serial' not in connection_info:
connection_info['serial'] = volume_id
try:
self.driver.detach_volume(connection_info,
instance['name'],
mp)
except Exception: # pylint: disable=W0702
with excutils.save_and_reraise_exception():
msg = _("Faild to detach volume %(volume_id)s from %(mp)s")
LOG.exception(msg % locals(), context=context,
instance=instance)
volume = self.volume_api.get(context, volume_id)
self.volume_api.roll_detaching(context, volume)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
@reverts_task_state
@wrap_instance_fault
def detach_volume(self, context, volume_id, instance):
"""Detach a volume from an instance."""
bdm = self._get_instance_volume_bdm(context, instance['uuid'],
volume_id)
self._detach_volume(context, instance, bdm)
volume = self.volume_api.get(context, volume_id)
connector = self.driver.get_volume_connector(instance)
self.volume_api.terminate_connection(context, volume, connector)
self.volume_api.detach(context.elevated(), volume)
self.db.block_device_mapping_destroy_by_instance_and_volume(
context, instance['uuid'], volume_id)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def remove_volume_connection(self, context, volume_id, instance):
"""Remove a volume connection using the volume api"""
# NOTE(vish): We don't want to actually mark the volume
# detached, or delete the bdm, just remove the
# connection from this host.
try:
bdm = self._get_instance_volume_bdm(context,
instance['uuid'],
volume_id)
self._detach_volume(context, instance, bdm)
volume = self.volume_api.get(context, volume_id)
connector = self.driver.get_volume_connector(instance)
self.volume_api.terminate_connection(context, volume, connector)
except exception.NotFound:
pass
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def check_can_live_migrate_destination(self, ctxt, instance,
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 context: security context
:param instance: dict of instance data
:param block_migration: if true, prepare for block migration
:param disk_over_commit: if true, allow disk over commit
Returns a mapping of values required in case of block migration
and None otherwise.
"""
dest_check_data = self.driver.check_can_live_migrate_destination(ctxt,
instance, block_migration, disk_over_commit)
try:
self.compute_rpcapi.check_can_live_migrate_source(ctxt,
instance, dest_check_data)
finally:
self.driver.check_can_live_migrate_destination_cleanup(ctxt,
dest_check_data)
if dest_check_data and 'migrate_data' in dest_check_data:
return dest_check_data['migrate_data']
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def check_can_live_migrate_source(self, ctxt, instance, 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: dict of instance data
:param dest_check_data: result of check_can_live_migrate_destination
"""
self.driver.check_can_live_migrate_source(ctxt, instance,
dest_check_data)
def pre_live_migration(self, context, instance,
block_migration=False, disk=None):
"""Preparations for live migration at dest host.
:param context: security context
:param instance: dict of instance data
:param block_migration: if true, prepare for block migration
"""
# If any volume is mounted, prepare here.
block_device_info = self._get_instance_volume_block_device_info(
context, instance['uuid'])
if not block_device_info['block_device_mapping']:
LOG.info(_('Instance has no volume.'), instance=instance)
network_info = self._get_instance_nw_info(context, instance)
# TODO(tr3buchet): figure out how on the earth this is necessary
fixed_ips = network_info.fixed_ips()
if not fixed_ips:
raise exception.FixedIpNotFoundForInstance(
instance_uuid=instance['uuid'])
self.driver.pre_live_migration(context, instance,
block_device_info,
self._legacy_nw_info(network_info))
# NOTE(tr3buchet): setup networks on destination host
self.network_api.setup_networks_on_host(context, instance,
self.host)
# Creating filters to hypervisors and firewalls.
# An example is that nova-instance-instance-xxx,
# which is written to libvirt.xml(Check "virsh nwfilter-list")
# This nwfilter is necessary on the destination host.
# In addition, this method is creating filtering rule
# onto destination host.
self.driver.ensure_filtering_rules_for_instance(instance,
self._legacy_nw_info(network_info))
# Preparation for block migration
if block_migration:
self.driver.pre_block_migration(context, instance, disk)
def live_migration(self, context, dest, instance,
block_migration=False, migrate_data=None):
"""Executing live migration.
:param context: security context
:param instance: instance dict
:param dest: destination host
:param block_migration: if true, prepare for block migration
:param migrate_data: implementation specific params
"""
try:
# Checking volume node is working correctly when any volumes
# are attached to instances.
if self._get_instance_volume_bdms(context, instance['uuid']):
rpc.call(context,
FLAGS.volume_topic,
{'method': 'check_for_export',
'args': {'instance_id': instance['id']}})
if block_migration:
disk = self.driver.get_instance_disk_info(instance['name'])
else:
disk = None
self.compute_rpcapi.pre_live_migration(context, instance,
block_migration, disk, dest)
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_('Pre live migration failed at %(dest)s'),
locals(), instance=instance)
self._rollback_live_migration(context, instance, dest,
block_migration)
# Executing live migration
# live_migration might raises exceptions, but
# nothing must be recovered in this version.
self.driver.live_migration(context, instance, dest,
self._post_live_migration,
self._rollback_live_migration,
block_migration, migrate_data)
def _post_live_migration(self, ctxt, instance_ref,
dest, block_migration=False):
"""Post operations for live migration.
This method is called from live_migration
and mainly updating database record.
:param ctxt: security context
:param instance_ref: nova.db.sqlalchemy.models.Instance
:param dest: destination host
:param block_migration: if true, prepare for block migration
"""
LOG.info(_('_post_live_migration() is started..'),
instance=instance_ref)
# Detaching volumes.
for bdm in self._get_instance_volume_bdms(ctxt, instance_ref['uuid']):
# NOTE(vish): We don't want to actually mark the volume
# detached, or delete the bdm, just remove the
# connection from this host.
self.remove_volume_connection(ctxt, bdm['volume_id'],
instance_ref)
# Releasing vlan.
# (not necessary in current implementation?)
network_info = self._get_instance_nw_info(ctxt, instance_ref)
# Releasing security group ingress rule.
self.driver.unfilter_instance(instance_ref,
self._legacy_nw_info(network_info))
# Database updating.
# NOTE(jkoelker) This needs to be converted to network api calls
# if nova wants to support floating_ips in
# quantum/melange
try:
# Not return if floating_ip is not found, otherwise,
# instance never be accessible..
floating_ip = self.db.instance_get_floating_address(ctxt,
instance_ref['id'])
if not floating_ip:
LOG.info(_('No floating_ip found'), instance=instance_ref)
else:
floating_ip_ref = self.db.floating_ip_get_by_address(ctxt,
floating_ip)
self.db.floating_ip_update(ctxt,
floating_ip_ref['address'],
{'host': dest})
except exception.NotFound:
LOG.info(_('No floating_ip found.'), instance=instance_ref)
except Exception, e:
LOG.error(_('Live migration: Unexpected error: cannot inherit '
'floating ip.\n%(e)s'), locals(),
instance=instance_ref)
# Define domain at destination host, without doing it,
# pause/suspend/terminate do not work.
self.compute_rpcapi.post_live_migration_at_destination(ctxt,
instance_ref, block_migration, dest)
# No instance booting at source host, but instance dir
# must be deleted for preparing next block migration
if block_migration:
self.driver.destroy(instance_ref,
self._legacy_nw_info(network_info))
else:
# self.driver.destroy() usually performs vif unplugging
# but we must do it explicitly here when block_migration
# is false, as the network devices at the source must be
# torn down
self.driver.unplug_vifs(instance_ref,
self._legacy_nw_info(network_info))
# NOTE(tr3buchet): tear down networks on source host
self.network_api.setup_networks_on_host(ctxt, instance_ref,
self.host, teardown=True)
LOG.info(_('Migrating instance to %(dest)s finished successfully.'),
locals(), instance=instance_ref)
LOG.info(_("You may see the error \"libvirt: QEMU error: "
"Domain not found: no domain with matching name.\" "
"This error can be safely ignored."),
instance=instance_ref)
def post_live_migration_at_destination(self, context, instance,
block_migration=False):
"""Post operations for live migration .
:param context: security context
:param instance: Instance dict
:param block_migration: if true, prepare for block migration
"""
LOG.info(_('Post operation of migration started'),
instance=instance)
# NOTE(tr3buchet): setup networks on destination host
# this is called a second time because
# multi_host does not create the bridge in
# plug_vifs
self.network_api.setup_networks_on_host(context, instance,
self.host)
network_info = self._get_instance_nw_info(context, instance)
self.driver.post_live_migration_at_destination(context, instance,
self._legacy_nw_info(network_info),
block_migration)
# Restore instance state
current_power_state = self._get_power_state(context, instance)
self._instance_update(context,
instance['uuid'],
host=self.host,
power_state=current_power_state,
vm_state=vm_states.ACTIVE,
task_state=None,
expected_task_state=task_states.MIGRATING)
# NOTE(vish): this is necessary to update dhcp
self.network_api.setup_networks_on_host(context, instance, self.host)
def _rollback_live_migration(self, context, instance_ref,
dest, block_migration):
"""Recovers Instance/volume state from migrating -> running.
:param context: security context
:param instance_ref: nova.db.sqlalchemy.models.Instance
:param dest:
This method is called from live migration src host.
This param specifies destination host.
:param block_migration: if true, prepare for block migration
"""
host = instance_ref['host']
self._instance_update(context,
instance_ref['uuid'],
host=host,
vm_state=vm_states.ACTIVE,
task_state=None,
expected_task_state=task_states.MIGRATING)
# NOTE(tr3buchet): setup networks on source host (really it's re-setup)
self.network_api.setup_networks_on_host(context, instance_ref,
self.host)
for bdm in self._get_instance_volume_bdms(context,
instance_ref['uuid']):
volume_id = bdm['volume_id']
volume = self.volume_api.get(context, volume_id)
self.compute_rpcapi.remove_volume_connection(context, instance_ref,
volume['id'], dest)
# Block migration needs empty image at destination host
# before migration starts, so if any failure occurs,
# any empty images has to be deleted.
if block_migration:
self.compute_rpcapi.rollback_live_migration_at_destination(context,
instance_ref, dest)
def rollback_live_migration_at_destination(self, context, instance):
""" Cleaning up image directory that is created pre_live_migration.
:param context: security context
:param instance: an Instance dict sent over rpc
"""
network_info = self._get_instance_nw_info(context, instance)
# NOTE(tr3buchet): tear down networks on destination host
self.network_api.setup_networks_on_host(context, instance,
self.host, teardown=True)
# NOTE(vish): The mapping is passed in so the driver can disconnect
# from remote volumes if necessary
block_device_info = self._get_instance_volume_block_device_info(
context, instance['uuid'])
self.driver.destroy(instance, self._legacy_nw_info(network_info),
block_device_info)
@manager.periodic_task
def _heal_instance_info_cache(self, context):
"""Called periodically. On every call, try to update the
info_cache's network information for another instance by
calling to the network manager.
This is implemented by keeping a cache of uuids of instances
that live on this host. On each call, we pop one off of a
list, pull the DB record, and try the call to the network API.
If anything errors, we don't care. It's possible the instance
has been deleted, etc.
"""
heal_interval = FLAGS.heal_instance_info_cache_interval
if not heal_interval:
return
curr_time = time.time()
if self._last_info_cache_heal + heal_interval > curr_time:
return
self._last_info_cache_heal = curr_time
instance_uuids = getattr(self, '_instance_uuids_to_heal', None)
instance = None
while not instance or instance['host'] != self.host:
if instance_uuids:
try:
instance = self.db.instance_get_by_uuid(context,
instance_uuids.pop(0))
except exception.InstanceNotFound:
# Instance is gone. Try to grab another.
continue
else:
# No more in our copy of uuids. Pull from the DB.
db_instances = self.db.instance_get_all_by_host(
context, self.host)
if not db_instances:
# None.. just return.
return
instance = db_instances.pop(0)
instance_uuids = [inst['uuid'] for inst in db_instances]
self._instance_uuids_to_heal = instance_uuids
# We have an instance now and it's ours
try:
# Call to network API to get instance info.. this will
# force an update to the instance's info_cache
self.network_api.get_instance_nw_info(context, instance)
LOG.debug(_('Updated the info_cache for instance'),
instance=instance)
except Exception:
# We don't care about any failures
pass
@manager.periodic_task
def _poll_rebooting_instances(self, context):
if FLAGS.reboot_timeout > 0:
self.driver.poll_rebooting_instances(FLAGS.reboot_timeout)
@manager.periodic_task
def _poll_rescued_instances(self, context):
if FLAGS.rescue_timeout > 0:
self.driver.poll_rescued_instances(FLAGS.rescue_timeout)
@manager.periodic_task
def _poll_unconfirmed_resizes(self, context):
if FLAGS.resize_confirm_window > 0:
migrations = self.db.migration_get_unconfirmed_by_dest_compute(
context, FLAGS.resize_confirm_window, self.host)
migrations_info = dict(migration_count=len(migrations),
confirm_window=FLAGS.resize_confirm_window)
if migrations_info["migration_count"] > 0:
LOG.info(_("Found %(migration_count)d unconfirmed migrations "
"older than %(confirm_window)d seconds"),
migrations_info)
def _set_migration_to_error(migration_id, reason, **kwargs):
msg = _("Setting migration %(migration_id)s to error: "
"%(reason)s") % locals()
LOG.warn(msg, **kwargs)
self.db.migration_update(context, migration_id,
{'status': 'error'})
for migration in migrations:
# NOTE(comstud): Yield to other greenthreads. Putting this
# at the top so we make sure to do it on each iteration.
greenthread.sleep(0)
migration_id = migration['id']
instance_uuid = migration['instance_uuid']
LOG.info(_("Automatically confirming migration "
"%(migration_id)s for instance %(instance_uuid)s"),
locals())
try:
instance = self.db.instance_get_by_uuid(context,
instance_uuid)
except exception.InstanceNotFound:
reason = _("Instance %(instance_uuid)s not found")
_set_migration_to_error(migration_id, reason % locals())
continue
if instance['vm_state'] == vm_states.ERROR:
reason = _("In ERROR state")
_set_migration_to_error(migration_id, reason % locals(),
instance=instance)
continue
vm_state = instance['vm_state']
task_state = instance['task_state']
if vm_state != vm_states.RESIZED or task_state is not None:
reason = _("In states %(vm_state)s/%(task_state)s, not"
"RESIZED/None")
_set_migration_to_error(migration_id, reason % locals(),
instance=instance)
continue
try:
self.compute_api.confirm_resize(context, instance)
except Exception, e:
msg = _("Error auto-confirming resize: %(e)s. "
"Will retry later.")
LOG.error(msg % locals(), instance=instance)
@manager.periodic_task
def _instance_usage_audit(self, context):
if FLAGS.instance_usage_audit:
if not compute_utils.has_audit_been_run(context, self.host):
begin, end = utils.last_completed_audit_period()
instances = self.db.instance_get_active_by_window_joined(
context,
begin,
end,
host=self.host)
num_instances = len(instances)
errors = 0
successes = 0
LOG.info(_("Running instance usage audit for"
" host %(host)s from %(begin_time)s to "
"%(end_time)s. %(number_instances)s"
" instances.") % dict(host=self.host,
begin_time=begin,
end_time=end,
number_instances=num_instances))
start_time = time.time()
compute_utils.start_instance_usage_audit(context,
begin, end,
self.host, num_instances)
for instance in instances:
try:
compute_utils.notify_usage_exists(
context, instance,
ignore_missing_network_data=False)
successes += 1
except Exception:
LOG.exception(_('Failed to generate usage '
'audit for instance '
'on host %s') % self.host,
instance=instance)
errors += 1
compute_utils.finish_instance_usage_audit(context,
begin, end,
self.host, errors,
"Instance usage audit ran "
"for host %s, %s instances "
"in %s seconds." % (
self.host,
num_instances,
time.time() - start_time))
@manager.periodic_task
def _poll_bandwidth_usage(self, context, start_time=None, stop_time=None):
if not start_time:
start_time = utils.last_completed_audit_period()[1]
curr_time = time.time()
if (curr_time - self._last_bw_usage_poll >
FLAGS.bandwidth_poll_interval):
self._last_bw_usage_poll = curr_time
LOG.info(_("Updating bandwidth usage cache"))
instances = self.db.instance_get_all_by_host(context, self.host)
try:
bw_usage = self.driver.get_all_bw_usage(instances, start_time,
stop_time)
except NotImplementedError:
# NOTE(mdragon): Not all hypervisors have bandwidth polling
# implemented yet. If they don't it doesn't break anything,
# they just don't get the info in the usage events.
return
refreshed = timeutils.utcnow()
for usage in bw_usage:
# Allow switching of greenthreads between queries.
greenthread.sleep(0)
self.db.bw_usage_update(context,
usage['uuid'],
usage['mac_address'],
start_time,
usage['bw_in'], usage['bw_out'],
last_refreshed=refreshed)
@manager.periodic_task
def _report_driver_status(self, context):
curr_time = time.time()
if curr_time - self._last_host_check > FLAGS.host_state_interval:
self._last_host_check = curr_time
LOG.info(_("Updating host status"))
# This will grab info about the host and queue it
# to be sent to the Schedulers.
capabilities = self.driver.get_host_stats(refresh=True)
capabilities['host_ip'] = FLAGS.my_ip
self.update_service_capabilities(capabilities)
@manager.periodic_task(ticks_between_runs=10)
def _sync_power_states(self, context):
"""Align power states between the database and the hypervisor.
To sync power state data we make a DB call to get the number of
virtual machines known by the hypervisor and if the number matches the
number of virtual machines known by the database, we proceed in a lazy
loop, one database record at a time, checking if the hypervisor has the
same power state as is in the database. We call eventlet.sleep(0) after
each loop to allow the periodic task eventlet to do other work.
If the instance is not found on the hypervisor, but is in the database,
then a stop() API will be called on the instance.
"""
db_instances = self.db.instance_get_all_by_host(context, self.host)
num_vm_instances = self.driver.get_num_instances()
num_db_instances = len(db_instances)
if num_vm_instances != num_db_instances:
LOG.warn(_("Found %(num_db_instances)s in the database and "
"%(num_vm_instances)s on the hypervisor.") % locals())
for db_instance in db_instances:
# Allow other periodic tasks to do some work...
greenthread.sleep(0)
db_power_state = db_instance['power_state']
if db_instance['task_state'] is not None:
LOG.info(_("During sync_power_state the instance has a "
"pending task. Skip."), instance=db_instance)
continue
# No pending tasks. Now try to figure out the real vm_power_state.
try:
vm_instance = self.driver.get_info(db_instance)
vm_power_state = vm_instance['state']
except exception.InstanceNotFound:
vm_power_state = power_state.NOSTATE
# Note(maoy): the above get_info call might take a long time,
# for example, because of a broken libvirt driver.
# We re-query the DB to get the latest instance info to minimize
# (not eliminate) race condition.
u = self.db.instance_get_by_uuid(context,
db_instance['uuid'])
db_power_state = u["power_state"]
vm_state = u['vm_state']
if self.host != u['host']:
# on the sending end of nova-compute _sync_power_state
# may have yielded to the greenthread performing a live
# migration; this in turn has changed the resident-host
# for the VM; However, the instance is still active, it
# is just in the process of migrating to another host.
# This implies that the compute source must relinquish
# control to the compute destination.
LOG.info(_("During the sync_power process the "
"instance has moved from "
"host %(src)s to host %(dst)s") %
{'src': self.host,
'dst': u['host']},
instance=db_instance)
continue
elif u['task_state'] is not None:
# on the receiving end of nova-compute, it could happen
# that the DB instance already report the new resident
# but the actual VM has not showed up on the hypervisor
# yet. In this case, let's allow the loop to continue
# and run the state sync in a later round
LOG.info(_("During sync_power_state the instance has a "
"pending task. Skip."), instance=db_instance)
continue
if vm_power_state != db_power_state:
# power_state is always updated from hypervisor to db
self._instance_update(context,
db_instance['uuid'],
power_state=vm_power_state)
db_power_state = vm_power_state
# Note(maoy): Now resolve the discrepancy between vm_state and
# vm_power_state. We go through all possible vm_states.
if vm_state in (vm_states.BUILDING,
vm_states.RESCUED,
vm_states.RESIZED,
vm_states.SUSPENDED,
vm_states.PAUSED,
vm_states.ERROR):
# TODO(maoy): we ignore these vm_state for now.
pass
elif vm_state == vm_states.ACTIVE:
# The only rational power state should be RUNNING
if vm_power_state in (power_state.NOSTATE,
power_state.SHUTDOWN,
power_state.CRASHED):
LOG.warn(_("Instance shutdown by itself. Calling "
"the stop API."), instance=db_instance)
try:
# Note(maoy): here we call the API instead of
# brutally updating the vm_state in the database
# to allow all the hooks and checks to be performed.
self.compute_api.stop(context, db_instance)
except Exception:
# Note(maoy): there is no need to propagate the error
# because the same power_state will be retrieved next
# time and retried.
# For example, there might be another task scheduled.
LOG.exception(_("error during stop() in "
"sync_power_state."),
instance=db_instance)
elif vm_power_state in (power_state.PAUSED,
power_state.SUSPENDED):
LOG.warn(_("Instance is paused or suspended "
"unexpectedly. Calling "
"the stop API."), instance=db_instance)
try:
self.compute_api.stop(context, db_instance)
except Exception:
LOG.exception(_("error during stop() in "
"sync_power_state."),
instance=db_instance)
elif vm_state == vm_states.STOPPED:
if vm_power_state not in (power_state.NOSTATE,
power_state.SHUTDOWN,
power_state.CRASHED):
LOG.warn(_("Instance is not stopped. Calling "
"the stop API."), instance=db_instance)
try:
# Note(maoy): this assumes that the stop API is
# idempotent.
self.compute_api.stop(context, db_instance)
except Exception:
LOG.exception(_("error during stop() in "
"sync_power_state."),
instance=db_instance)
elif vm_state in (vm_states.SOFT_DELETED,
vm_states.DELETED):
if vm_power_state not in (power_state.NOSTATE,
power_state.SHUTDOWN):
# Note(maoy): this should be taken care of periodically in
# _cleanup_running_deleted_instances().
LOG.warn(_("Instance is not (soft-)deleted."),
instance=db_instance)
@manager.periodic_task
def _reclaim_queued_deletes(self, context):
"""Reclaim instances that are queued for deletion."""
interval = FLAGS.reclaim_instance_interval
if interval <= 0:
LOG.debug(_("FLAGS.reclaim_instance_interval <= 0, skipping..."))
return
instances = self.db.instance_get_all_by_host(context, self.host)
for instance in instances:
old_enough = (not instance.deleted_at or
timeutils.is_older_than(instance.deleted_at,
interval))
soft_deleted = instance.vm_state == vm_states.SOFT_DELETED
if soft_deleted and old_enough:
LOG.info(_('Reclaiming deleted instance'), instance=instance)
self._delete_instance(context, instance)
@manager.periodic_task
def update_available_resource(self, context):
"""See driver.get_available_resource()
Periodic process that keeps that the compute host's understanding of
resource availability and usage in sync with the underlying hypervisor.
:param context: security context
"""
self.resource_tracker.update_available_resource(context)
@manager.periodic_task(
ticks_between_runs=FLAGS.running_deleted_instance_poll_interval)
def _cleanup_running_deleted_instances(self, context):
"""Cleanup any instances which are erroneously still running after
having been deleted.
Valid actions to take are:
1. noop - do nothing
2. log - log which instances are erroneously running
3. reap - shutdown and cleanup any erroneously running instances
The use-case for this cleanup task is: for various reasons, it may be
possible for the database to show an instance as deleted but for that
instance to still be running on a host machine (see bug
https://bugs.launchpad.net/nova/+bug/911366).
This cleanup task is a cross-hypervisor utility for finding these
zombied instances and either logging the discrepancy (likely what you
should do in production), or automatically reaping the instances (more
appropriate for dev environments).
"""
action = FLAGS.running_deleted_instance_action
if action == "noop":
return
# NOTE(sirp): admin contexts don't ordinarily return deleted records
with utils.temporary_mutation(context, read_deleted="yes"):
for instance in self._running_deleted_instances(context):
if action == "log":
name = instance['name']
LOG.warning(_("Detected instance with name label "
"'%(name)s' which is marked as "
"DELETED but still present on host."),
locals(), instance=instance)
elif action == 'reap':
name = instance['name']
LOG.info(_("Destroying instance with name label "
"'%(name)s' which is marked as "
"DELETED but still present on host."),
locals(), instance=instance)
self._shutdown_instance(context, instance)
self._cleanup_volumes(context, instance['uuid'])
else:
raise Exception(_("Unrecognized value '%(action)s'"
" for FLAGS.running_deleted_"
"instance_action"), locals(),
instance=instance)
def _running_deleted_instances(self, context):
"""Returns a list of instances nova thinks is deleted,
but the hypervisor thinks is still running. This method
should be pushed down to the virt layer for efficiency.
"""
def deleted_instance(instance):
timeout = FLAGS.running_deleted_instance_timeout
present = instance.name in present_name_labels
erroneously_running = instance.deleted and present
old_enough = (not instance.deleted_at or
timeutils.is_older_than(instance.deleted_at,
timeout))
if erroneously_running and old_enough:
return True
return False
present_name_labels = set(self.driver.list_instances())
instances = self.db.instance_get_all_by_host(context, self.host)
return [i for i in instances if deleted_instance(i)]
@contextlib.contextmanager
def _error_out_instance_on_exception(self, context, instance_uuid,
reservations=None):
try:
yield
except Exception, error:
self._quota_rollback(context, reservations)
with excutils.save_and_reraise_exception():
msg = _('%s. Setting instance vm_state to ERROR')
LOG.error(msg % error, instance_uuid=instance_uuid)
self._set_instance_error_state(context, instance_uuid)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def add_aggregate_host(self, context, aggregate_id, host, slave_info=None):
"""Notify hypervisor of change (for hypervisor pools)."""
aggregate = self.db.aggregate_get(context, aggregate_id)
try:
self.driver.add_to_aggregate(context, aggregate, host,
slave_info=slave_info)
except exception.AggregateError:
with excutils.save_and_reraise_exception():
self.driver.undo_aggregate_operation(context,
self.db.aggregate_host_delete,
aggregate.id, host)
@exception.wrap_exception(notifier=notifier, publisher_id=publisher_id())
def remove_aggregate_host(self, context, aggregate_id,
host, slave_info=None):
"""Removes a host from a physical hypervisor pool."""
aggregate = self.db.aggregate_get(context, aggregate_id)
try:
self.driver.remove_from_aggregate(context, aggregate, host,
slave_info=slave_info)
except (exception.AggregateError,
exception.InvalidAggregateAction) as e:
with excutils.save_and_reraise_exception():
self.driver.undo_aggregate_operation(
context, self.db.aggregate_host_add,
aggregate.id, host,
isinstance(e, exception.AggregateError))
@manager.periodic_task(
ticks_between_runs=FLAGS.image_cache_manager_interval)
def _run_image_cache_manager_pass(self, context):
"""Run a single pass of the image cache manager."""
if FLAGS.image_cache_manager_interval == 0:
return
try:
self.driver.manage_image_cache(context)
except NotImplementedError:
pass
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