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OpenStack Study: num_instances_filter.py**** CubicPower OpenStack Study ****
# Copyright (c) 2012 OpenStack Foundation # 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. from oslo.config import cfg from nova.openstack.common.gettextutils import _ from nova.openstack.common import log as logging from nova.scheduler import filters LOG = logging.getLogger(__name__) max_instances_per_host_opt = cfg.IntOpt("max_instances_per_host", default=50, help="Ignore hosts that have too many instances") CONF = cfg.CONF CONF.register_opt(max_instances_per_host_opt)
**** CubicPower OpenStack Study **** class NumInstancesFilter(filters.BaseHostFilter): """Filter out hosts with too many instances."""
**** CubicPower OpenStack Study **** def host_passes(self, host_state, filter_properties): num_instances = host_state.num_instances max_instances = CONF.max_instances_per_host passes = num_instances < max_instances if not passes: LOG.debug(_("%(host_state)s fails num_instances check: Max " "instances per host is set to %(max_instances)s"), {'host_state': host_state, 'max_instances': max_instances}) return passes
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