133 lines
5.8 KiB
Python
133 lines
5.8 KiB
Python
# 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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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 fixtures as func_fixtures
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from nova.tests.functional import integrated_helpers
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from nova.tests.unit import cast_as_call
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from nova.tests.unit.image import fake as image_fake
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from nova.tests.unit import policy_fixture
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class SchedulerOnlyChecksTargetTest(test.TestCase,
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integrated_helpers.InstanceHelperMixin):
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"""Regression test for bug 1702454 introduced in Newton.
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That test is for verifying that if we evacuate by providing a target, the
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scheduler only checks the related host. If the host is not able to
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accepting the instance, it would return a NoValidHost to the user instead
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of passing the instance to another host.
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Unfortunately, when we wrote the feature for that in Newton, we forgot to
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transform the new RequestSpec field called `requested_destination` into an
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item for the legacy filter_properties dictionary so the scheduler wasn't
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getting it.
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That test will use 3 hosts:
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- host1 which will be the source host for the instance
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- host2 which will be the requested target when evacuating from host1
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- host3 which could potentially be the evacuation target if the scheduler
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doesn't correctly get host2 as the requested destination from the user.
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"""
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def setUp(self):
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super(SchedulerOnlyChecksTargetTest, 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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# 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(func_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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# The admin API is used to get the server details to verify the
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# host on which the server was built.
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self.admin_api = api_fixture.admin_api
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self.api = api_fixture.api
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# the image fake backend needed for image discovery
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image_fake.stub_out_image_service(self)
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self.addCleanup(image_fake.FakeImageService_reset)
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self.start_service('conductor')
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# We have to get the image before we use 2.latest otherwise we'll get
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# a 404 on the /images proxy API because of 2.36.
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self.image_id = self.api.get_images()[0]['id']
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# Use the latest microversion available to make sure something does
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# not regress in new microversions; cap as necessary.
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self.admin_api.microversion = 'latest'
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self.api.microversion = 'latest'
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# Define a very basic scheduler that only verifies if host is down.
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self.flags(enabled_filters=['ComputeFilter'],
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group='filter_scheduler')
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# NOTE(sbauza): Use the HostNameWeigherFixture so we are sure that
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# we prefer first host1 for the boot request and forget about any
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# other weigher.
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# Host2 should only be preferred over host3 if and only if that's the
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# only host we verify (as requested_destination does).
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self.useFixture(nova_fixtures.HostNameWeigherFixture(
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weights={'host1': 100, 'host2': 1, 'host3': 50}))
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self.start_service('scheduler')
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# Let's now start three compute nodes as we said above.
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self.start_service('compute', host='host1')
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self.start_service('compute', host='host2')
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self.start_service('compute', host='host3')
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self.useFixture(cast_as_call.CastAsCall(self))
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def test_evacuate_server(self):
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# We first create the instance
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server = self.admin_api.post_server(
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dict(server=self._build_minimal_create_server_request(
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'my-pretty-instance-to-evacuate', self.image_id,
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networks='none')))
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server_id = server['id']
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self.addCleanup(self.api.delete_server, server_id)
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self._wait_for_state_change(server, 'ACTIVE')
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# We need to get instance details for knowing its host
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server = self.admin_api.get_server(server_id)
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host = server['OS-EXT-SRV-ATTR:host']
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# As weigher prefers host1, we are sure we find it here.
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self.assertEqual('host1', host)
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# Now, force host1 to be down. As we use ComputeFilter, it won't ever
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# be a possible destination for the scheduler now.
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self.admin_api.microversion = '2.11' # Cap for the force-down call.
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self.admin_api.force_down_service(host, 'nova-compute', True)
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self.admin_api.microversion = 'latest'
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# It's time to evacuate by asking host2 as a target. Remember, the
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# only possibility the instance can end up on it is because the
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# scheduler should only verify the requested destination as host2
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# is weighed lower than host3.
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evacuate = {
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'evacuate': {
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'host': 'host2'
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}
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}
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self.admin_api.post_server_action(server['id'], evacuate)
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self._wait_for_state_change(server, 'ACTIVE')
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server = self.admin_api.get_server(server_id)
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# Yeepee, that works!
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self.assertEqual('host2', server['OS-EXT-SRV-ATTR:host'])
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