OpenStack Compute (Nova)
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# Copyright 2018 Red Hat, Inc.
#
# 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 oslo_utils.fixture import uuidsentinel as uuids
from nova import exception
from nova import test
from nova.tests import fixtures as nova_fixtures
from nova.tests.functional import integrated_helpers
class FakeCinderError(object):
"""Poor man's Mock because we're stubbing out and not mock.patching. Stubs
out attachment_delete. We keep a raise and call count to simulate a single
volume error while being able to assert that we still got called for all
of an instance's volumes.
"""
def __init__(self):
self.raise_count = 0
self.call_count = 0
def __call__(self, *args, **kwargs):
self.call_count += 1
if self.raise_count == 0:
self.raise_count += 1
raise exception.CinderConnectionFailed(reason='Fake Cinder error')
class LiveMigrationCinderFailure(integrated_helpers._IntegratedTestBase):
# Default self.api to the self.admin_api as live migration is admin only
ADMIN_API = True
api_major_version = 'v2.1'
microversion = 'latest'
def setUp(self):
super(LiveMigrationCinderFailure, self).setUp()
# Start a second compute 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.
self.compute2 = self.start_service('compute', host='host2')
def test_live_migrate_attachment_delete_fails(self):
server = self.api.post_server({
'server': {
'flavorRef': 1,
'imageRef': '155d900f-4e14-4e4c-a73d-069cbf4541e6',
'name': 'live-migrate-attachment-delete-fail-test',
'networks': 'none',
'block_device_mapping_v2': [
{'boot_index': 0,
'uuid': uuids.broken_volume,
'source_type': 'volume',
'destination_type': 'volume'},
{'boot_index': 1,
'uuid': uuids.working_volume,
'source_type': 'volume',
'destination_type': 'volume'}]}})
server = self._wait_for_state_change(server, 'ACTIVE')
source = server['OS-EXT-SRV-ATTR:host']
if source == self.compute.host:
dest = self.compute2.host
else:
dest = self.compute.host
post = {
'os-migrateLive': {
'host': dest,
'block_migration': False,
}
}
stub_attachment_delete = FakeCinderError()
self.stub_out('nova.volume.cinder.API.attachment_delete',
stub_attachment_delete)
self.api.post_server_action(server['id'], post)
self._wait_for_server_parameter(server,
{'OS-EXT-SRV-ATTR:host': dest,
'status': 'ACTIVE'})
self.assertEqual(2, stub_attachment_delete.call_count)
self.assertEqual(1, stub_attachment_delete.raise_count)
class TestVolAttachmentsDuringLiveMigration(
integrated_helpers._IntegratedTestBase
):
"""Assert the lifecycle of volume attachments during LM rollbacks
"""
# Default self.api to the self.admin_api as live migration is admin only
ADMIN_API = True
microversion = 'latest'
def _setup_compute_service(self):
self._start_compute('src')
self._start_compute('dest')
@mock.patch('nova.virt.fake.FakeDriver.live_migration')
def test_vol_attachments_during_driver_live_mig_failure(self, mock_lm):
"""Assert volume attachments during live migration rollback
* Mock live_migration to always rollback and raise a failure within the
fake 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
live_migration method
* Assert that the instance is still on the source host
* Assert that the original source host volume attachment remains
"""
# Mock out driver.live_migration so that we always rollback
def _fake_live_migration_with_rollback(
context, instance, dest, post_method, recover_method,
block_migration=False, migrate_data=None):
# Just call the recover_method to simulate a rollback
recover_method(context, instance, dest, migrate_data)
# raise test.TestingException here to imitate a virt driver
raise test.TestingException()
mock_lm.side_effect = _fake_live_migration_with_rollback
volume_id = nova_fixtures.CinderFixture.IMAGE_BACKED_VOL
server = self._build_server(
name='test_bfv_live_migration_failure', image_uuid='',
networks='none'
)
server['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(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 live_migration raising TestingException
self._live_migrate(server, 'error', server_expected_state='ERROR')
# Assert that we called the fake live_migration method
mock_lm.assert_called_once()
# Assert that the instance is on the source
server = self.api.get_server(server['id'])
self.assertEqual(src_host, server['OS-EXT-SRV-ATTR:host'])
# Assert that the src attachment is still present
attachments = self.cinder.volume_to_attachment.get(volume_id)
self.assertIn(src_attachment_id, attachments.keys())
self.assertEqual(1, len(attachments))
class LiveMigrationNeutronInteractionsTest(
integrated_helpers._IntegratedTestBase):
# NOTE(artom) We need the admin API to force the host when booting the test
# server.
ADMIN_API = True
microversion = 'latest'
def _setup_compute_service(self):
self._start_compute('src')
self._start_compute('dest')
def test_live_migrate_vifs_from_info_cache(self):
"""Test that bug 1879787 can no longer manifest itself because we get
the network_info from the instance info cache, and not Neutron.
"""
def stub_notify(context, instance, event_suffix,
network_info=None, extra_usage_info=None, fault=None):
vif = network_info[0]
# Make sure we have the correct VIF (the NeutronFixture
# deterministically uses port_2 for networks=auto) and that the
# profile does not contain `migrating_to`, indicating that we did
# not obtain it from the Neutron API.
self.assertEqual(self.neutron.port_2['id'], vif['id'])
self.assertNotIn('migrating_to', vif['profile'])
server = self._create_server(networks='auto',
host=self.computes['src'].host)
with mock.patch.object(self.computes['src'].manager,
'_notify_about_instance_usage',
side_effect=stub_notify) as mock_notify:
self._live_migrate(server, 'completed')
server = self.api.get_server(server['id'])
self.assertEqual('dest', server['OS-EXT-SRV-ATTR:host'])
# We don't care about call arguments here, we just want to be sure
# our stub actually got called.
mock_notify.assert_called()