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# Copyright (c) 2010 OpenStack Foundation
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.
"""
Scheduler Service
"""
from oslo.config import cfg
from oslo import messaging
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
from nova.conductor import api as conductor_api
from nova.conductor.tasks import live_migrate
from nova import exception
from nova import manager
from nova.objects import instance as instance_obj
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 import periodic_task
from nova import quota
from nova.scheduler import utils as scheduler_utils
LOG = logging.getLogger(__name__)
scheduler_driver_opt = cfg.StrOpt('scheduler_driver',
default='nova.scheduler.filter_scheduler.FilterScheduler',
help='Default driver to use for the scheduler')
CONF = cfg.CONF
CONF.register_opt(scheduler_driver_opt)
QUOTAS = quota.QUOTAS
class SchedulerManager(manager.Manager):
"""Chooses a host to run instances on."""
target = messaging.Target(version='2.9')
def __init__(self, scheduler_driver=None, *args, **kwargs):
if not scheduler_driver:
scheduler_driver = CONF.scheduler_driver
self.driver = importutils.import_object(scheduler_driver)
self.compute_rpcapi = compute_rpcapi.ComputeAPI()
super(SchedulerManager, self).__init__(service_name='scheduler',
*args, **kwargs)
def create_volume(self, context, volume_id, snapshot_id,
reservations=None, image_id=None):
#function removed in RPC API 2.3
pass
@messaging.expected_exceptions(exception.NoValidHost,
exception.ComputeServiceUnavailable,
exception.InvalidHypervisorType,
exception.UnableToMigrateToSelf,
exception.DestinationHypervisorTooOld,
exception.InvalidLocalStorage,
exception.InvalidSharedStorage,
exception.MigrationPreCheckError)
def live_migration(self, context, instance, dest,
block_migration, disk_over_commit):
try:
self._schedule_live_migration(context, instance, dest,
block_migration, disk_over_commit)
except (exception.NoValidHost,
exception.ComputeServiceUnavailable,
exception.InvalidHypervisorType,
exception.UnableToMigrateToSelf,
exception.DestinationHypervisorTooOld,
exception.InvalidLocalStorage,
exception.InvalidSharedStorage,
exception.MigrationPreCheckError) as ex:
request_spec = {'instance_properties': {
'uuid': instance['uuid'], },
}
with excutils.save_and_reraise_exception():
self._set_vm_state_and_notify('live_migration',
dict(vm_state=instance['vm_state'],
task_state=None,
expected_task_state=task_states.MIGRATING,),
context, ex, request_spec)
except Exception as ex:
request_spec = {'instance_properties': {
'uuid': instance['uuid'], },
}
with excutils.save_and_reraise_exception():
self._set_vm_state_and_notify('live_migration',
{'vm_state': vm_states.ERROR},
context, ex, request_spec)
def _schedule_live_migration(self, context, instance, dest,
block_migration, disk_over_commit):
task = live_migrate.LiveMigrationTask(context, instance,
dest, block_migration, disk_over_commit)
return task.execute()
def run_instance(self, context, request_spec, admin_password,
injected_files, requested_networks, is_first_time,
filter_properties, legacy_bdm_in_spec=True):
"""Tries to call schedule_run_instance on the driver.
Sets instance vm_state to ERROR on exceptions
"""
instance_uuids = request_spec['instance_uuids']
with compute_utils.EventReporter(context, conductor_api.LocalAPI(),
'schedule', *instance_uuids):
try:
return self.driver.schedule_run_instance(context,
request_spec, admin_password, injected_files,
requested_networks, is_first_time, filter_properties,
legacy_bdm_in_spec)
except exception.NoValidHost as ex:
# don't re-raise
self._set_vm_state_and_notify('run_instance',
{'vm_state': vm_states.ERROR,
'task_state': None},
context, ex, request_spec)
except Exception as ex:
with excutils.save_and_reraise_exception():
self._set_vm_state_and_notify('run_instance',
{'vm_state': vm_states.ERROR,
'task_state': None},
context, ex, request_spec)
def prep_resize(self, context, image, request_spec, filter_properties,
instance, instance_type, reservations):
"""Tries to call schedule_prep_resize on the driver.
Sets instance vm_state to ACTIVE on NoHostFound
Sets vm_state to ERROR on other exceptions
"""
instance_uuid = instance['uuid']
with compute_utils.EventReporter(context, conductor_api.LocalAPI(),
'schedule', instance_uuid):
try:
request_spec['num_instances'] = len(
request_spec['instance_uuids'])
hosts = self.driver.select_destinations(
context, request_spec, filter_properties)
host_state = hosts[0]
scheduler_utils.populate_filter_properties(filter_properties,
host_state)
# context is not serializable
filter_properties.pop('context', None)
(host, node) = (host_state['host'], host_state['nodename'])
attrs = ['metadata', 'system_metadata', 'info_cache',
'security_groups']
inst_obj = instance_obj.Instance._from_db_object(
context, instance_obj.Instance(), instance,
expected_attrs=attrs)
self.compute_rpcapi.prep_resize(
context, image, inst_obj, instance_type, host,
reservations, request_spec=request_spec,
filter_properties=filter_properties, node=node)
except exception.NoValidHost as ex:
vm_state = instance.get('vm_state', vm_states.ACTIVE)
self._set_vm_state_and_notify('prep_resize',
{'vm_state': vm_state,
'task_state': None},
context, ex, request_spec)
if reservations:
QUOTAS.rollback(context, reservations)
except Exception as ex:
with excutils.save_and_reraise_exception():
self._set_vm_state_and_notify('prep_resize',
{'vm_state': vm_states.ERROR,
'task_state': None},
context, ex, request_spec)
if reservations:
QUOTAS.rollback(context, reservations)
def _set_vm_state_and_notify(self, method, updates, context, ex,
request_spec):
scheduler_utils.set_vm_state_and_notify(
context, 'scheduler', method, updates, ex, request_spec, self.db)
# NOTE(hanlind): This method can be removed in v3.0 of the RPC API.
def show_host_resources(self, context, host):
"""Shows the physical/usage resource given by hosts.
:param context: security context
:param host: hostname
:returns:
example format is below::
{'resource':D, 'usage':{proj_id1:D, proj_id2:D}}
D: {'vcpus': 3, 'memory_mb': 2048, 'local_gb': 2048,
'vcpus_used': 12, 'memory_mb_used': 10240,
'local_gb_used': 64}
"""
# Getting compute node info and related instances info
service_ref = self.db.service_get_by_compute_host(context, host)
instance_refs = self.db.instance_get_all_by_host(context,
service_ref['host'])
# Getting total available/used resource
compute_ref = service_ref['compute_node'][0]
resource = {'vcpus': compute_ref['vcpus'],
'memory_mb': compute_ref['memory_mb'],
'local_gb': compute_ref['local_gb'],
'vcpus_used': compute_ref['vcpus_used'],
'memory_mb_used': compute_ref['memory_mb_used'],
'local_gb_used': compute_ref['local_gb_used']}
usage = dict()
if not instance_refs:
return {'resource': resource, 'usage': usage}
# Getting usage resource per project
project_ids = [i['project_id'] for i in instance_refs]
project_ids = list(set(project_ids))
for project_id in project_ids:
vcpus = [i['vcpus'] for i in instance_refs
if i['project_id'] == project_id]
mem = [i['memory_mb'] for i in instance_refs
if i['project_id'] == project_id]
root = [i['root_gb'] for i in instance_refs
if i['project_id'] == project_id]
ephemeral = [i['ephemeral_gb'] for i in instance_refs
if i['project_id'] == project_id]
usage[project_id] = {'vcpus': sum(vcpus),
'memory_mb': sum(mem),
'root_gb': sum(root),
'ephemeral_gb': sum(ephemeral)}
return {'resource': resource, 'usage': usage}
@periodic_task.periodic_task
def _expire_reservations(self, context):
QUOTAS.expire(context)
# NOTE(russellb) This method can be removed in 3.0 of this API. It is
# deprecated in favor of the method in the base API.
def get_backdoor_port(self, context):
return self.backdoor_port
# NOTE(hanlind): This method can be removed in v4.0 of the RPC API.
@messaging.expected_exceptions(exception.NoValidHost)
def select_hosts(self, context, request_spec, filter_properties):
"""Returns host(s) best suited for this request_spec
and filter_properties.
"""
dests = self.driver.select_destinations(context, request_spec,
filter_properties)
hosts = [dest['host'] for dest in dests]
return jsonutils.to_primitive(hosts)
@messaging.expected_exceptions(exception.NoValidHost)
def select_destinations(self, context, request_spec, filter_properties):
"""Returns destinations(s) best suited for this request_spec and
filter_properties.
The result should be a list of dicts with 'host', 'nodename' and
'limits' as keys.
"""
dests = self.driver.select_destinations(context, request_spec,
filter_properties)
return jsonutils.to_primitive(dests)
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