360 lines
14 KiB
Python
360 lines
14 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2010 OpenStack, LLC.
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Scheduler base class that all Schedulers should inherit from
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"""
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import sys
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from nova.compute import api as compute_api
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from nova.compute import power_state
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from nova.compute import rpcapi as compute_rpcapi
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from nova.compute import utils as compute_utils
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from nova.compute import vm_states
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from nova import db
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from nova import exception
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from nova import flags
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from nova import notifications
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from nova.openstack.common import cfg
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from nova.openstack.common import importutils
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from nova.openstack.common import log as logging
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from nova.openstack.common.notifier import api as notifier
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from nova.openstack.common import rpc
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from nova.openstack.common import timeutils
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from nova import utils
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LOG = logging.getLogger(__name__)
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scheduler_driver_opts = [
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cfg.StrOpt('scheduler_host_manager',
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default='nova.scheduler.host_manager.HostManager',
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help='The scheduler host manager class to use'),
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cfg.IntOpt('scheduler_max_attempts',
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default=3,
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help='Maximum number of attempts to schedule an instance'),
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]
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FLAGS = flags.FLAGS
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FLAGS.register_opts(scheduler_driver_opts)
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flags.DECLARE('instances_path', 'nova.compute.manager')
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flags.DECLARE('libvirt_type', 'nova.virt.libvirt.driver')
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def handle_schedule_error(context, ex, instance_uuid, request_spec):
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if not isinstance(ex, exception.NoValidHost):
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LOG.exception(_("Exception during scheduler.run_instance"))
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compute_utils.add_instance_fault_from_exc(context,
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instance_uuid, ex, sys.exc_info())
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state = vm_states.ERROR.upper()
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LOG.warning(_('Setting instance to %(state)s state.'),
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locals(), instance_uuid=instance_uuid)
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# update instance state and notify on the transition
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(old_ref, new_ref) = db.instance_update_and_get_original(context,
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instance_uuid, {'vm_state': vm_states.ERROR,
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'task_state': None})
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notifications.send_update(context, old_ref, new_ref,
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service="scheduler")
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properties = request_spec.get('instance_properties', {})
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payload = dict(request_spec=request_spec,
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instance_properties=properties,
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instance_id=instance_uuid,
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state=vm_states.ERROR,
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method='run_instance',
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reason=ex)
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notifier.notify(context, notifier.publisher_id("scheduler"),
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'scheduler.run_instance', notifier.ERROR, payload)
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def cast_to_volume_host(context, host, method, **kwargs):
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"""Cast request to a volume host queue"""
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volume_id = kwargs.get('volume_id', None)
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if volume_id is not None:
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now = timeutils.utcnow()
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db.volume_update(context, volume_id,
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{'host': host, 'scheduled_at': now})
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rpc.cast(context,
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rpc.queue_get_for(context, 'volume', host),
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{"method": method, "args": kwargs})
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LOG.debug(_("Casted '%(method)s' to volume '%(host)s'") % locals())
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def instance_update_db(context, instance_uuid, host):
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'''Set the host and scheduled_at fields of an Instance.
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:returns: An Instance with the updated fields set properly.
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'''
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now = timeutils.utcnow()
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values = {'host': host, 'scheduled_at': now}
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return db.instance_update(context, instance_uuid, values)
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def cast_to_compute_host(context, host, method, **kwargs):
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"""Cast request to a compute host queue"""
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instance_uuid = kwargs.get('instance_uuid', None)
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if instance_uuid:
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instance_update_db(context, instance_uuid, host)
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rpc.cast(context,
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rpc.queue_get_for(context, 'compute', host),
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{"method": method, "args": kwargs})
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LOG.debug(_("Casted '%(method)s' to compute '%(host)s'") % locals())
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def cast_to_network_host(context, host, method, **kwargs):
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"""Cast request to a network host queue"""
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rpc.cast(context,
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rpc.queue_get_for(context, 'network', host),
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{"method": method, "args": kwargs})
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LOG.debug(_("Casted '%(method)s' to network '%(host)s'") % locals())
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def cast_to_host(context, topic, host, method, **kwargs):
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"""Generic cast to host"""
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topic_mapping = {
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"compute": cast_to_compute_host,
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"volume": cast_to_volume_host,
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'network': cast_to_network_host}
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func = topic_mapping.get(topic)
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if func:
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func(context, host, method, **kwargs)
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else:
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rpc.cast(context,
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rpc.queue_get_for(context, topic, host),
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{"method": method, "args": kwargs})
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LOG.debug(_("Casted '%(method)s' to %(topic)s '%(host)s'")
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% locals())
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def encode_instance(instance, local=True):
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"""Encode locally created instance for return via RPC"""
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# TODO(comstud): I would love to be able to return the full
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# instance information here, but we'll need some modifications
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# to the RPC code to handle datetime conversions with the
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# json encoding/decoding. We should be able to set a default
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# json handler somehow to do it.
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#
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# For now, I'll just return the instance ID and let the caller
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# do a DB lookup :-/
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if local:
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return dict(id=instance['id'], _is_precooked=False)
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else:
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inst = dict(instance)
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inst['_is_precooked'] = True
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return inst
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class Scheduler(object):
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"""The base class that all Scheduler classes should inherit from."""
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def __init__(self):
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self.host_manager = importutils.import_object(
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FLAGS.scheduler_host_manager)
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self.compute_api = compute_api.API()
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self.compute_rpcapi = compute_rpcapi.ComputeAPI()
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def update_service_capabilities(self, service_name, host, capabilities):
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"""Process a capability update from a service node."""
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self.host_manager.update_service_capabilities(service_name,
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host, capabilities)
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def hosts_up(self, context, topic):
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"""Return the list of hosts that have a running service for topic."""
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services = db.service_get_all_by_topic(context, topic)
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return [service['host']
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for service in services
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if utils.service_is_up(service)]
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def schedule_prep_resize(self, context, image, request_spec,
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filter_properties, instance, instance_type,
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reservations):
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"""Must override schedule_prep_resize method for scheduler to work."""
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msg = _("Driver must implement schedule_prep_resize")
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raise NotImplementedError(msg)
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def schedule_run_instance(self, context, request_spec,
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admin_password, injected_files,
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requested_networks, is_first_time,
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filter_properties):
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"""Must override schedule_run_instance method for scheduler to work."""
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msg = _("Driver must implement schedule_run_instance")
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raise NotImplementedError(msg)
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def schedule_create_volume(self, context, volume_id, snapshot_id, image_id,
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reservations):
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msg = _("Driver must implement schedule_create_volune")
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raise NotImplementedError(msg)
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def schedule_live_migration(self, context, instance, dest,
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block_migration, disk_over_commit):
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"""Live migration scheduling method.
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:param context:
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:param instance: instance dict
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:param dest: destination host
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:param block_migration: if true, block_migration.
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:param disk_over_commit: if True, consider real(not virtual)
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disk size.
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:return:
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The host where instance is running currently.
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Then scheduler send request that host.
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"""
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# Check we can do live migration
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self._live_migration_src_check(context, instance)
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self._live_migration_dest_check(context, instance, dest)
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self._live_migration_common_check(context, instance, dest)
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migrate_data = self.compute_rpcapi.check_can_live_migrate_destination(
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context, instance, dest, block_migration, disk_over_commit)
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# Perform migration
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src = instance['host']
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self.compute_rpcapi.live_migration(context, host=src,
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instance=instance, dest=dest,
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block_migration=block_migration,
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migrate_data=migrate_data)
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def _live_migration_src_check(self, context, instance_ref):
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"""Live migration check routine (for src host).
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:param context: security context
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:param instance_ref: nova.db.sqlalchemy.models.Instance object
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"""
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# TODO(johngar) why is this not in the API layer?
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# Checking instance is running.
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if instance_ref['power_state'] != power_state.RUNNING:
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raise exception.InstanceNotRunning(
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instance_id=instance_ref['uuid'])
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# Checking src host exists and compute node
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src = instance_ref['host']
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try:
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services = db.service_get_all_compute_by_host(context, src)
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except exception.NotFound:
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raise exception.ComputeServiceUnavailable(host=src)
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# Checking src host is alive.
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if not utils.service_is_up(services[0]):
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raise exception.ComputeServiceUnavailable(host=src)
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def _live_migration_dest_check(self, context, instance_ref, dest):
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"""Live migration check routine (for destination host).
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:param context: security context
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:param instance_ref: nova.db.sqlalchemy.models.Instance object
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:param dest: destination host
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"""
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# Checking dest exists and compute node.
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dservice_refs = db.service_get_all_compute_by_host(context, dest)
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dservice_ref = dservice_refs[0]
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# Checking dest host is alive.
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if not utils.service_is_up(dservice_ref):
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raise exception.ComputeServiceUnavailable(host=dest)
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# Checking whether The host where instance is running
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# and dest is not same.
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src = instance_ref['host']
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if dest == src:
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raise exception.UnableToMigrateToSelf(
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instance_id=instance_ref['uuid'], host=dest)
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# Check memory requirements
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self._assert_compute_node_has_enough_memory(context,
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instance_ref, dest)
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def _live_migration_common_check(self, context, instance_ref, dest):
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"""Live migration common check routine.
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The following checks are based on
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http://wiki.libvirt.org/page/TodoPreMigrationChecks
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:param context: security context
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:param instance_ref: nova.db.sqlalchemy.models.Instance object
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:param dest: destination host
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"""
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dservice_ref = self._get_compute_info(context, dest)
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src = instance_ref['host']
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oservice_ref = self._get_compute_info(context, src)
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# Checking hypervisor is same.
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orig_hypervisor = oservice_ref['hypervisor_type']
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dest_hypervisor = dservice_ref['hypervisor_type']
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if orig_hypervisor != dest_hypervisor:
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raise exception.InvalidHypervisorType()
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# Checking hypervisor version.
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orig_hypervisor = oservice_ref['hypervisor_version']
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dest_hypervisor = dservice_ref['hypervisor_version']
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if orig_hypervisor > dest_hypervisor:
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raise exception.DestinationHypervisorTooOld()
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def _assert_compute_node_has_enough_memory(self, context,
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instance_ref, dest):
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"""Checks if destination host has enough memory for live migration.
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:param context: security context
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:param instance_ref: nova.db.sqlalchemy.models.Instance object
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:param dest: destination host
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"""
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# Getting total available memory of host
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avail = self._get_compute_info(context, dest)['memory_mb']
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# Getting total used memory and disk of host
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# It should be sum of memories that are assigned as max value,
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# because overcommitting is risky.
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instance_refs = db.instance_get_all_by_host(context, dest)
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used = sum([i['memory_mb'] for i in instance_refs])
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mem_inst = instance_ref['memory_mb']
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avail = avail - used
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if avail <= mem_inst:
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instance_uuid = instance_ref['uuid']
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reason = _("Unable to migrate %(instance_uuid)s to %(dest)s: "
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"Lack of memory(host:%(avail)s <= "
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"instance:%(mem_inst)s)")
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raise exception.MigrationError(reason=reason % locals())
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def _get_compute_info(self, context, host):
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"""get compute node's information specified by key
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:param context: security context
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:param host: hostname(must be compute node)
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:param key: column name of compute_nodes
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:return: value specified by key
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"""
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compute_node_ref = db.service_get_all_compute_by_host(context, host)
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return compute_node_ref[0]['compute_node'][0]
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