OpenStack Compute (Nova)
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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.
import mock
from nova.compute import api as compute_api
from nova import context as nova_context
from nova import objects
from nova import test
from nova.tests.functional import integrated_helpers
class ColdMigrationDisallowSameHost(
integrated_helpers.ProviderUsageBaseTestCase):
"""Tests cold migrate where the source host does not have the
COMPUTE_SAME_HOST_COLD_MIGRATE trait.
"""
compute_driver = 'fake.MediumFakeDriver'
def setUp(self):
super(ColdMigrationDisallowSameHost, self).setUp()
# Start one compute service which will use the fake virt driver
# which disallows cold migration to the same host.
self._start_compute('host1')
def _wait_for_migrate_no_valid_host(self, error='NoValidHost'):
event = self.notifier.wait_for_versioned_notifications(
'compute_task.migrate_server.error')[0]
self.assertEqual(error,
event['payload']['nova_object.data']['reason'][
'nova_object.data']['exception'])
def test_cold_migrate_same_host_not_supported(self):
"""Simple test to show that you cannot cold-migrate to the same host
when the resource provider does not expose the
COMPUTE_SAME_HOST_COLD_MIGRATE trait.
"""
server = self._create_server(networks='none')
# The fake driver does not report COMPUTE_SAME_HOST_COLD_MIGRATE
# so cold migration should fail since we only have one host.
self.api.post_server_action(server['id'], {'migrate': None})
self._wait_for_migrate_no_valid_host()
def test_cold_migrate_same_host_old_compute_disallow(self):
"""Upgrade compat test where the resource provider does not report
the COMPUTE_SAME_HOST_COLD_MIGRATE trait but the compute service is
old so the API falls back to the allow_resize_to_same_host config which
defaults to False.
"""
server = self._create_server(networks='none')
# Stub the compute service version check to make the compute service
# appear old.
fake_service = objects.Service()
fake_service.version = (
compute_api.MIN_COMPUTE_SAME_HOST_COLD_MIGRATE - 1)
with mock.patch('nova.objects.Service.get_by_compute_host',
return_value=fake_service) as mock_get_service:
self.api.post_server_action(server['id'], {'migrate': None})
mock_get_service.assert_called_once_with(
test.MatchType(nova_context.RequestContext), 'host1')
# Since allow_resize_to_same_host defaults to False scheduling failed
# since there are no other hosts.
self._wait_for_migrate_no_valid_host()
def test_cold_migrate_same_host_old_compute_allow(self):
"""Upgrade compat test where the resource provider does not report
the COMPUTE_SAME_HOST_COLD_MIGRATE trait but the compute service is
old so the API falls back to the allow_resize_to_same_host config which
in this test is set to True.
"""
self.flags(allow_resize_to_same_host=True)
server = self._create_server(networks='none')
# Stub the compute service version check to make the compute service
# appear old.
fake_service = objects.Service()
fake_service.version = (
compute_api.MIN_COMPUTE_SAME_HOST_COLD_MIGRATE - 1)
with mock.patch('nova.objects.Service.get_by_compute_host',
return_value=fake_service) as mock_get_service:
self.api.post_server_action(server['id'], {'migrate': None})
mock_get_service.assert_called_once_with(
test.MatchType(nova_context.RequestContext), 'host1')
# In this case the compute is old so the API falls back to checking
# allow_resize_to_same_host which says same-host cold migrate is
# allowed so the scheduler sends the request to the only compute
# available but the virt driver says same-host cold migrate is not
# supported and raises UnableToMigrateToSelf. A reschedule is sent
# to conductor which results in MaxRetriesExceeded since there are no
# alternative hosts.
self._wait_for_migrate_no_valid_host(error='MaxRetriesExceeded')
class ColdMigrationAllowSameHost(
integrated_helpers.ProviderUsageBaseTestCase):
"""Tests cold migrate where the source host has the
COMPUTE_SAME_HOST_COLD_MIGRATE trait.
"""
compute_driver = 'fake.SameHostColdMigrateDriver'
def setUp(self):
super(ColdMigrationAllowSameHost, self).setUp()
self._start_compute('host1')
def test_cold_migrate_same_host_supported(self):
"""Simple test to show that you can cold-migrate to the same host
when the resource provider exposes the COMPUTE_SAME_HOST_COLD_MIGRATE
trait.
"""
server = self._create_server(networks='none')
self.api.post_server_action(server['id'], {'migrate': None})
server = self._wait_for_state_change(server, 'VERIFY_RESIZE')
self.assertEqual('host1', server['OS-EXT-SRV-ATTR:host'])