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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 import test
from nova.tests import fixtures as nova_fixtures
from nova.tests.functional import integrated_helpers
from nova.tests.unit import fake_notifier
from nova.virt import fake
class TestVolAttachmentsDuringPreLiveMigration(
integrated_helpers._IntegratedTestBase,
integrated_helpers.InstanceHelperMixin
):
"""Regression test for bug 1889108.
This regression test asserts that the original source volume attachments
are incorrectly removed during the rollback from pre_live_migration
failures on the destination.
"""
api_major_version = 'v2.1'
microversion = 'latest'
ADMIN_API = True
USE_NEUTRON = True
def setUp(self):
super(TestVolAttachmentsDuringPreLiveMigration, self).setUp()
self.cinder = self.useFixture(
nova_fixtures.CinderFixtureNewAttachFlow(self))
fake_notifier.stub_notifier(self)
self.addCleanup(fake_notifier.reset)
def _setup_compute_service(self):
# Start a second compte node (the first one was started for us by
# _IntegratedTestBase. set_nodes() is needed to avoid duplicate
# nodenames. See comments in test_bug_1702454.py.
fake.set_nodes(['src'])
self.addCleanup(fake.restore_nodes)
self.start_service('compute', host='src')
fake.set_nodes(['dest'])
self.addCleanup(fake.restore_nodes)
self.start_service('compute', host='dest')
@mock.patch('nova.virt.fake.FakeDriver.pre_live_migration',
side_effect=test.TestingException)
def test_vol_attachments_during_driver_pre_live_mig_failure(
self, mock_plm):
"""Assert that the src attachment is incorrectly removed
* Mock pre_live_migration to always fail within the virt driver
* Launch a boot from volume instance
* Assert that the volume is attached correctly to the instance.
* Live migrate the instance to another host invoking the mocked
pre_live_migration
* Assert that the instance is still on the source host
* Assert that both the original source host volume attachment and
new destination volume attachment have been removed
"""
volume_id = nova_fixtures.CinderFixture.IMAGE_BACKED_VOL
server = {
'name': 'test_bfv_pre_live_migration_failure',
'flavorRef': 1,
'imageRef': '',
'networks': 'none',
'block_device_mapping_v2': [{
'source_type': 'volume',
'destination_type': 'volume',
'boot_index': 0,
'uuid': volume_id}],
}
server = self.api.post_server({'server': server})
self._wait_for_state_change(self.api, server, 'ACTIVE')
# Fetch the source host for use later
server = self.api.get_server(server['id'])
src_host = server['OS-EXT-SRV-ATTR:host']
# Assert that the volume is connected to the instance
self.assertIn(
volume_id, self.cinder.volume_ids_for_instance(server['id']))
# Assert that we have an active attachment in the fixture
attachments = self.cinder.volume_to_attachment.get(volume_id)
self.assertEqual(1, len(attachments))
# Fetch the attachment_id for use later once we have migrated
src_attachment_id = list(attachments.keys())[0]
# Migrate the instance and wait until the migration errors out thanks
# to our mocked version of pre_live_migration raising
# test.TestingException
self.api.post_server_action(
server['id'],
{'os-migrateLive': {'host': None, 'block_migration': 'auto'}})
self._wait_for_state_change(self.api, server, 'ACTIVE')
self._wait_for_migration_status(server, ['error'])
# Assert that we called the fake pre_live_migration method
mock_plm.assert_called_once()
# Assert that the instance is listed on the source
server = self.api.get_server(server['id'])
self.assertEqual(src_host, server['OS-EXT-SRV-ATTR:host'])
# FIXME(lyarwood): Assert that both the src and dest attachments have
# been removed. Only the dest attachment should be removed during the
# rollback of a pre_live_migration failure.
attachments = self.cinder.volume_to_attachment.get(volume_id)
self.assertNotIn(src_attachment_id, attachments.keys())
self.assertEqual(0, len(attachments))
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