146 lines
6.2 KiB
Python
146 lines
6.2 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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Simple Scheduler
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"""
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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.openstack.common import cfg
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from nova.scheduler import chance
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from nova.scheduler import driver
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from nova import utils
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simple_scheduler_opts = [
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cfg.IntOpt("max_cores",
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default=16,
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help="maximum number of instance cores to allow per host"),
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cfg.IntOpt("max_gigabytes",
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default=10000,
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help="maximum number of volume gigabytes to allow per host"),
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cfg.IntOpt("max_networks",
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default=1000,
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help="maximum number of networks to allow per host"),
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cfg.BoolOpt('skip_isolated_core_check',
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default=True,
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help='Allow overcommitting vcpus on isolated hosts'),
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]
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FLAGS = flags.FLAGS
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FLAGS.register_opts(simple_scheduler_opts)
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class SimpleScheduler(chance.ChanceScheduler):
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"""Implements Naive Scheduler that tries to find least loaded host."""
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def _schedule_instance(self, context, instance_opts, *_args, **_kwargs):
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"""Picks a host that is up and has the fewest running instances."""
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elevated = context.elevated()
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availability_zone = instance_opts.get('availability_zone')
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zone, host = FLAGS.default_schedule_zone, None
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if availability_zone:
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zone, _x, host = availability_zone.partition(':')
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if host and context.is_admin:
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service = db.service_get_by_args(elevated, host, 'nova-compute')
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if not utils.service_is_up(service):
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raise exception.WillNotSchedule(host=host)
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return host
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results = db.service_get_all_compute_sorted(elevated)
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in_isolation = instance_opts['image_ref'] in FLAGS.isolated_images
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check_cores = not in_isolation or not FLAGS.skip_isolated_core_check
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if zone:
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results = [(service, cores) for (service, cores) in results
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if service['availability_zone'] == zone]
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for result in results:
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(service, instance_cores) = result
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if in_isolation and service['host'] not in FLAGS.isolated_hosts:
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# isloated images run on isolated hosts
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continue
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if service['host'] in FLAGS.isolated_hosts and not in_isolation:
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# images that aren't isolated only run on general hosts
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continue
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if (check_cores and
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instance_cores + instance_opts['vcpus'] > FLAGS.max_cores):
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msg = _("Not enough allocatable CPU cores remaining")
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raise exception.NoValidHost(reason=msg)
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if utils.service_is_up(service) and not service['disabled']:
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return service['host']
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msg = _("Is the appropriate service running?")
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raise exception.NoValidHost(reason=msg)
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def schedule_run_instance(self, context, request_spec, reservations,
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*_args, **_kwargs):
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num_instances = request_spec.get('num_instances', 1)
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instances = []
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for num in xrange(num_instances):
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host = self._schedule_instance(context,
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request_spec['instance_properties'], *_args, **_kwargs)
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request_spec['instance_properties']['launch_index'] = num
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instance_ref = self.create_instance_db_entry(context,
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request_spec, reservations)
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driver.cast_to_compute_host(context, host, 'run_instance',
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instance_uuid=instance_ref['uuid'], **_kwargs)
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instances.append(driver.encode_instance(instance_ref))
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# So if we loop around, create_instance_db_entry will actually
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# create a new entry, instead of assume it's been created
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# already
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del request_spec['instance_properties']['uuid']
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return instances
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def schedule_create_volume(self, context, volume_id, *_args, **_kwargs):
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"""Picks a host that is up and has the fewest volumes."""
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elevated = context.elevated()
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volume_ref = db.volume_get(context, volume_id)
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availability_zone = volume_ref.get('availability_zone')
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zone, host = None, None
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if availability_zone:
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zone, _x, host = availability_zone.partition(':')
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if host and context.is_admin:
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service = db.service_get_by_args(elevated, host, 'nova-volume')
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if not utils.service_is_up(service):
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raise exception.WillNotSchedule(host=host)
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driver.cast_to_volume_host(context, host, 'create_volume',
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volume_id=volume_id, **_kwargs)
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return None
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results = db.service_get_all_volume_sorted(elevated)
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if zone:
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results = [(service, gigs) for (service, gigs) in results
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if service['availability_zone'] == zone]
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for result in results:
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(service, volume_gigabytes) = result
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if volume_gigabytes + volume_ref['size'] > FLAGS.max_gigabytes:
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msg = _("Not enough allocatable volume gigabytes remaining")
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raise exception.NoValidHost(reason=msg)
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if utils.service_is_up(service) and not service['disabled']:
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driver.cast_to_volume_host(context, service['host'],
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'create_volume', volume_id=volume_id, **_kwargs)
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return None
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msg = _("Is the appropriate service running?")
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raise exception.NoValidHost(reason=msg)
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