173 lines
7.5 KiB
Python
173 lines
7.5 KiB
Python
# 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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from nova import test
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from nova.tests import fixtures as nova_fixtures
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from nova.tests.functional import integrated_helpers
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from nova.tests.unit import fake_network
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from nova.tests.unit import fake_notifier
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import nova.tests.unit.image.fake
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from nova.tests.unit import policy_fixture
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from nova.virt import fake
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class TestParallelEvacuationWithServerGroup(
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test.TestCase, integrated_helpers.InstanceHelperMixin):
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"""Verifies that the server group policy is not violated during parallel
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evacuation.
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"""
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def setUp(self):
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super(TestParallelEvacuationWithServerGroup, self).setUp()
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self.useFixture(policy_fixture.RealPolicyFixture())
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# The NeutronFixture is needed to stub out validate_networks in API.
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self.useFixture(nova_fixtures.NeutronFixture(self))
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# This stubs out the network allocation in compute.
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fake_network.set_stub_network_methods(self)
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# We need the computes reporting into placement for the filter
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# scheduler to pick a host.
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self.useFixture(nova_fixtures.PlacementFixture())
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api_fixture = self.useFixture(nova_fixtures.OSAPIFixture(
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api_version='v2.1'))
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self.api = api_fixture.admin_api
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# 2.11 is needed for force_down
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# 2.14 is needed for evacuate without onSharedStorage flag
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self.api.microversion = '2.14'
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# the image fake backend needed for image discovery
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nova.tests.unit.image.fake.stub_out_image_service(self)
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self.addCleanup(nova.tests.unit.image.fake.FakeImageService_reset)
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self.start_service('conductor')
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self.start_service('scheduler')
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# We start two compute services because we need two instances with
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# anti-affinity server group policy to be booted
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fake.set_nodes(['host1'])
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self.addCleanup(fake.restore_nodes)
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self.compute1 = self.start_service('compute', host='host1')
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fake.set_nodes(['host2'])
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self.addCleanup(fake.restore_nodes)
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self.compute2 = self.start_service('compute', host='host2')
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self.image_id = self.api.get_images()[0]['id']
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self.flavor_id = self.api.get_flavors()[0]['id']
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manager_class = nova.compute.manager.ComputeManager
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original_rebuild = manager_class._do_rebuild_instance
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self.addCleanup(fake_notifier.reset)
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def fake_rebuild(self_, context, instance, *args, **kwargs):
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# Simulate that the rebuild request of one of the instances
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# reaches the target compute manager significantly later so the
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# rebuild of the other instance can finish before the late
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# validation of the first rebuild.
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# We cannot simply delay the virt driver's rebuild or the
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# manager's _rebuild_default_impl as those run after the late
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# validation
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if instance.host == 'host1':
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# wait for the other instance rebuild to start
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fake_notifier.wait_for_versioned_notifications(
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'instance.rebuild.start', n_events=1)
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original_rebuild(self_, context, instance, *args, **kwargs)
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self.stub_out('nova.compute.manager.ComputeManager.'
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'_do_rebuild_instance', fake_rebuild)
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def test_parallel_evacuate_with_server_group(self):
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group_req = {'name': 'a-name', 'policies': ['anti-affinity']}
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group = self.api.post_server_groups(group_req)
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# boot two instances with anti-affinity
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server = {'name': 'server',
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'imageRef': self.image_id,
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'flavorRef': self.flavor_id}
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hints = {'group': group['id']}
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created_server1 = self.api.post_server({'server': server,
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'os:scheduler_hints': hints})
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server1 = self._wait_for_state_change(self.api,
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created_server1, 'ACTIVE')
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created_server2 = self.api.post_server({'server': server,
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'os:scheduler_hints': hints})
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server2 = self._wait_for_state_change(self.api,
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created_server2, 'ACTIVE')
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# assert that the anti-affinity policy is enforced during the boot
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self.assertNotEqual(server1['OS-EXT-SRV-ATTR:host'],
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server2['OS-EXT-SRV-ATTR:host'])
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# simulate compute failure on both compute host to allow evacuation
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self.compute1.stop()
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# force it down to avoid waiting for the service group to time out
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self.api.force_down_service('host1', 'nova-compute', True)
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self.compute2.stop()
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self.api.force_down_service('host2', 'nova-compute', True)
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# start a third compute to have place for one of the instances
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fake.set_nodes(['host3'])
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self.addCleanup(fake.restore_nodes)
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self.compute3 = self.start_service('compute', host='host3')
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# evacuate both instances
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post = {'evacuate': {}}
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self.api.post_server_action(server1['id'], post)
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self.api.post_server_action(server2['id'], post)
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# make sure that the rebuild is started and then finished
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fake_notifier.wait_for_versioned_notifications(
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'instance.rebuild.start', n_events=2)
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server1 = self._wait_for_server_parameter(
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self.api, server1, {'OS-EXT-STS:task_state': None})
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server2 = self._wait_for_server_parameter(
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self.api, server2, {'OS-EXT-STS:task_state': None})
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# NOTE(gibi): The instance.host set _after_ the instance state and
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# tast_state is set back to normal so it is not enough to wait for
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# that. The only thing that happens after the instance.host is set to
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# the target host is the migration status setting to done. So we have
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# to wait for that to avoid asserting the wrong host below.
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self._wait_for_migration_status(server1, ['done', 'failed'])
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self._wait_for_migration_status(server2, ['done', 'failed'])
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# get the servers again to have the latest information about their
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# hosts
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server1 = self.api.get_server(server1['id'])
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server2 = self.api.get_server(server2['id'])
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# assert that the anti-affinity policy is enforced during the
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# evacuation
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self.assertNotEqual(server1['OS-EXT-SRV-ATTR:host'],
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server2['OS-EXT-SRV-ATTR:host'])
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# assert that one of the evacuation was successful and that server is
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# moved to another host and the evacuation of the other server is
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# failed
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if server1['status'] == 'ERROR':
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failed_server = server1
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evacuated_server = server2
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else:
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failed_server = server2
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evacuated_server = server1
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self.assertEqual('ERROR', failed_server['status'])
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self.assertNotEqual('host3', failed_server['OS-EXT-SRV-ATTR:host'])
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self.assertEqual('ACTIVE', evacuated_server['status'])
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self.assertEqual('host3', evacuated_server['OS-EXT-SRV-ATTR:host'])
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