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# 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 nova import context
from nova import objects
from nova.tests.functional import integrated_helpers
class ResizeEvacuateTestCase(integrated_helpers._IntegratedTestBase):
"""Regression test for bug 1669054 introduced in Newton.
When resizing a server, if CONF.allow_resize_to_same_host is False,
the API will set RequestSpec.ignore_hosts = [instance.host] and then
later in conductor the RequestSpec changes are saved to persist the new
flavor. This inadvertently saves the ignore_hosts value. Later if you
try to migrate, evacuate or unshelve the server, that original source
host will be ignored. If the deployment has a small number of computes,
like two in an edge node, then evacuate will fail because the only other
available host is ignored. This test recreates the scenario.
"""
# Set variables used in the parent class.
REQUIRES_LOCKING = False
ADMIN_API = True
api_major_version = 'v2.1'
microversion = '2.11' # Need at least 2.11 for the force-down API
def test_resize_then_evacuate(self):
# Create a server. At this point there is only one compute service.
flavors = self.api.get_flavors()
flavor1 = flavors[0]['id']
server = self._build_server(flavor_id=flavor1)
server = self.api.post_server({'server': server})
self._wait_for_state_change(server, 'ACTIVE')
# Start up another compute service so we can resize.
host2 = self.start_service('compute', host='host2')
# Now resize the server to move it to host2.
flavor2 = flavors[1]['id']
req = {'resize': {'flavorRef': flavor2}}
self.api.post_server_action(server['id'], req)
server = self._wait_for_state_change(server, 'VERIFY_RESIZE')
self.assertEqual('host2', server['OS-EXT-SRV-ATTR:host'])
self.api.post_server_action(server['id'], {'confirmResize': None})
server = self._wait_for_state_change(server, 'ACTIVE')
# Disable the host on which the server is now running (host2).
host2.stop()
self.api.force_down_service('host2', 'nova-compute', forced_down=True)
# Now try to evacuate the server back to the original source compute.
server = self._evacuate_server(
server, {'onSharedStorage': 'False'},
expected_host=self.compute.host, expected_migration_status='done',
expected_state='ACTIVE')
# Assert the RequestSpec.ignore_hosts field is not populated.
reqspec = objects.RequestSpec.get_by_instance_uuid(
context.get_admin_context(), server['id'])
self.assertIsNone(reqspec.ignore_hosts)
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