148 lines
5.1 KiB
Python
148 lines
5.1 KiB
Python
# Copyright 2012, Piston Cloud Computing, Inc.
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# Copyright 2012, OpenStack Foundation
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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");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import netaddr
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from oslo_log import log as logging
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from nova.scheduler import filters
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from nova.scheduler.filters import utils
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LOG = logging.getLogger(__name__)
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class DifferentHostFilter(filters.BaseHostFilter):
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"""Schedule the instance on a different host from a set of instances."""
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# The hosts the instances are running on doesn't change within a request
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run_filter_once_per_request = True
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RUN_ON_REBUILD = False
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def host_passes(self, host_state, spec_obj):
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affinity_uuids = spec_obj.get_scheduler_hint('different_host')
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if affinity_uuids:
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overlap = utils.instance_uuids_overlap(host_state, affinity_uuids)
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return not overlap
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# With no different_host key
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return True
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class SameHostFilter(filters.BaseHostFilter):
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"""Schedule the instance on the same host as another instance in a set of
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instances.
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"""
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# The hosts the instances are running on doesn't change within a request
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run_filter_once_per_request = True
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RUN_ON_REBUILD = False
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def host_passes(self, host_state, spec_obj):
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affinity_uuids = spec_obj.get_scheduler_hint('same_host')
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if affinity_uuids:
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overlap = utils.instance_uuids_overlap(host_state, affinity_uuids)
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return overlap
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# With no same_host key
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return True
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class SimpleCIDRAffinityFilter(filters.BaseHostFilter):
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"""Schedule the instance on a host with a particular cidr"""
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# The address of a host doesn't change within a request
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run_filter_once_per_request = True
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RUN_ON_REBUILD = False
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def host_passes(self, host_state, spec_obj):
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affinity_cidr = spec_obj.get_scheduler_hint('cidr', '/24')
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affinity_host_addr = spec_obj.get_scheduler_hint('build_near_host_ip')
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host_ip = host_state.host_ip
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if affinity_host_addr:
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affinity_net = netaddr.IPNetwork(str.join('', (affinity_host_addr,
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affinity_cidr)))
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return netaddr.IPAddress(host_ip) in affinity_net
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# We don't have an affinity host address.
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return True
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class _GroupAntiAffinityFilter(filters.BaseHostFilter):
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"""Schedule the instance on a different host from a set of group
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hosts.
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"""
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RUN_ON_REBUILD = False
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def host_passes(self, host_state, spec_obj):
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# Only invoke the filter if 'anti-affinity' is configured
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policies = (spec_obj.instance_group.policies
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if spec_obj.instance_group else [])
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if self.policy_name not in policies:
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return True
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# NOTE(hanrong): Move operations like resize can check the same source
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# compute node where the instance is. That case, AntiAffinityFilter
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# must not return the source as a non-possible destination.
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if spec_obj.instance_uuid in host_state.instances.keys():
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return True
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group_hosts = (spec_obj.instance_group.hosts
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if spec_obj.instance_group else [])
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LOG.debug("Group anti affinity: check if %(host)s not "
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"in %(configured)s", {'host': host_state.host,
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'configured': group_hosts})
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if group_hosts:
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return host_state.host not in group_hosts
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# No groups configured
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return True
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class ServerGroupAntiAffinityFilter(_GroupAntiAffinityFilter):
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def __init__(self):
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self.policy_name = 'anti-affinity'
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super(ServerGroupAntiAffinityFilter, self).__init__()
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class _GroupAffinityFilter(filters.BaseHostFilter):
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"""Schedule the instance on to host from a set of group hosts.
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"""
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RUN_ON_REBUILD = False
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def host_passes(self, host_state, spec_obj):
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# Only invoke the filter if 'affinity' is configured
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policies = (spec_obj.instance_group.policies
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if spec_obj.instance_group else [])
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if self.policy_name not in policies:
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return True
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group_hosts = (spec_obj.instance_group.hosts
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if spec_obj.instance_group else [])
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LOG.debug("Group affinity: check if %(host)s in "
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"%(configured)s", {'host': host_state.host,
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'configured': group_hosts})
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if group_hosts:
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return host_state.host in group_hosts
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# No groups configured
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return True
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class ServerGroupAffinityFilter(_GroupAffinityFilter):
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def __init__(self):
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self.policy_name = 'affinity'
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super(ServerGroupAffinityFilter, self).__init__()
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