73 lines
2.9 KiB
Python
73 lines
2.9 KiB
Python
# Copyright (c) 2011-2012 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"); 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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import nova.conf
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from nova.scheduler import filters
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CONF = nova.conf.CONF
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class IsolatedHostsFilter(filters.BaseHostFilter):
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"""Keep specified images to selected hosts."""
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# The configuration values do not change within a request
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run_filter_once_per_request = True
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RUN_ON_REBUILD = True
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def host_passes(self, host_state, spec_obj):
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"""Result Matrix with 'restrict_isolated_hosts_to_isolated_images' set
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to True::
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| | isolated_image | non_isolated_image
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| -------------+----------------+-------------------
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| iso_host | True | False
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| non_iso_host | False | True
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Result Matrix with 'restrict_isolated_hosts_to_isolated_images' set
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to False::
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| | isolated_image | non_isolated_image
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| -------------+----------------+-------------------
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| iso_host | True | True
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| non_iso_host | False | True
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"""
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# If the configuration does not list any hosts, the filter will always
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# return True, assuming a configuration error, so letting all hosts
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# through.
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isolated_hosts = CONF.filter_scheduler.isolated_hosts
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isolated_images = CONF.filter_scheduler.isolated_images
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restrict_isolated_hosts_to_isolated_images = (
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CONF.filter_scheduler.restrict_isolated_hosts_to_isolated_images)
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if not isolated_images:
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# As there are no images to match, return True if the filter is
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# not restrictive otherwise return False if the host is in the
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# isolation list.
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return ((not restrict_isolated_hosts_to_isolated_images) or
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(host_state.host not in isolated_hosts))
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# Check to see if the image id is set since volume-backed instances
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# can be created without an imageRef in the server create request.
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image_ref = spec_obj.image.id \
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if spec_obj.image and 'id' in spec_obj.image else None
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image_isolated = image_ref in isolated_images
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host_isolated = host_state.host in isolated_hosts
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if restrict_isolated_hosts_to_isolated_images:
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return (image_isolated == host_isolated)
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else:
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return (not image_isolated) or host_isolated
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