61 lines
2.0 KiB
Python
61 lines
2.0 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 Service
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"""
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import logging
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from nova import db
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from nova import flags
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from nova import manager
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from nova import rpc
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from nova import utils
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FLAGS = flags.FLAGS
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flags.DEFINE_string('scheduler_driver',
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'nova.scheduler.chance.ChanceScheduler',
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'Driver to use for the scheduler')
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class SchedulerManager(manager.Manager):
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"""
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Chooses a host to run instances on.
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"""
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def __init__(self, scheduler_driver=None, *args, **kwargs):
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if not scheduler_driver:
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scheduler_driver = FLAGS.scheduler_driver
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self.driver = utils.import_object(scheduler_driver)
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super(SchedulerManager, self).__init__(*args, **kwargs)
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def run_instance(self, context, instance_id, **_kwargs):
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"""
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Picks a node for a running VM and casts the run_instance request
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"""
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host = self.driver.pick_host(context, instance_id, **_kwargs)
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rpc.cast(db.queue_get_for(context, FLAGS.compute_topic, host),
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{"method": "run_instance",
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"args": {"context": context,
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"instance_id": instance_id}})
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logging.debug("Casting to compute %s for running instance %s",
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host, instance_id)
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