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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/rocky
   Importance: Undecided
       Status: New

** Changed in: nova/rocky
       Status: New => Fix Released

** Changed in: nova/rocky
   Importance: Undecided => Medium

** Changed in: nova/rocky
     Assignee: (unassigned) => Lee Yarwood (lyarwood)

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https://bugs.launchpad.net/bugs/1788403

Title:
  test_server_connectivity_cold_migration_revert randomly fails ssh
  check

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) rocky series:
  Fix Released

Bug description:
  Seen here:

  http://logs.openstack.org/98/591898/3/check/tempest-slow/c480e82/job-
  output.txt.gz#_2018-08-21_23_20_11_337095

  2018-08-21 23:20:11.337095 | controller | {0} tempest.scenario.test_network_advanced_server_ops.TestNetworkAdvancedServerOps.test_server_connectivity_cold_migration_revert [200.028926s] ... FAILED
  2018-08-21 23:20:11.337187 | controller |
  2018-08-21 23:20:11.337260 | controller | Captured traceback:
  2018-08-21 23:20:11.337329 | controller | ~~~~~~~~~~~~~~~~~~~
  2018-08-21 23:20:11.337435 | controller |     Traceback (most recent call last):
  2018-08-21 23:20:11.337591 | controller |       File "tempest/common/utils/__init__.py", line 89, in wrapper
  2018-08-21 23:20:11.337702 | controller |         return f(*func_args, **func_kwargs)
  2018-08-21 23:20:11.338012 | controller |       File "tempest/scenario/test_network_advanced_server_ops.py", line 258, in test_server_connectivity_cold_migration_revert
  2018-08-21 23:20:11.338175 | controller |         server, keypair, floating_ip)
  2018-08-21 23:20:11.338571 | controller |       File "tempest/scenario/test_network_advanced_server_ops.py", line 103, in _wait_server_status_and_check_network_connectivity
  2018-08-21 23:20:11.338766 | controller |         self._check_network_connectivity(server, keypair, floating_ip)
  2018-08-21 23:20:11.339004 | controller |       File "tempest/scenario/test_network_advanced_server_ops.py", line 96, in _check_network_connectivity
  2018-08-21 23:20:11.339069 | controller |         server)
  2018-08-21 23:20:11.339251 | controller |       File "tempest/scenario/manager.py", line 622, in check_vm_connectivity
  2018-08-21 23:20:11.339314 | controller |         msg=msg)
  2018-08-21 23:20:11.339572 | controller |       File "/opt/stack/tempest/.tox/tempest/local/lib/python2.7/site-packages/unittest2/case.py", line 702, in assertTrue
  2018-08-21 23:20:11.339683 | controller |         raise self.failureException(msg)
  2018-08-21 23:20:11.339862 | controller |     AssertionError: False is not true : Public network connectivity check failed
  2018-08-21 23:20:11.340000 | controller |     Timed out waiting for 172.24.5.13 to become reachable

  The test is pretty simple:

      @decorators.idempotent_id('25b188d7-0183-4b1e-a11d-15840c8e2fd6')
      @testtools.skipUnless(CONF.compute_feature_enabled.cold_migration,
                            'Cold migration is not available.')
      @testtools.skipUnless(CONF.compute.min_compute_nodes > 1,
                            'Less than 2 compute nodes, skipping multinode '
                            'tests.')
      @decorators.attr(type='slow')
      @utils.services('compute', 'network')
      def test_server_connectivity_cold_migration_revert(self):
          keypair = self.create_keypair()
          server = self._setup_server(keypair)
          floating_ip = self._setup_network(server, keypair)
          src_host = self._get_host_for_server(server['id'])
          self._wait_server_status_and_check_network_connectivity(
              server, keypair, floating_ip)

          self.admin_servers_client.migrate_server(server['id'])
          waiters.wait_for_server_status(self.servers_client, server['id'],
                                         'VERIFY_RESIZE')
          self.servers_client.revert_resize_server(server['id'])
          self._wait_server_status_and_check_network_connectivity(
              server, keypair, floating_ip)
          dst_host = self._get_host_for_server(server['id'])

          self.assertEqual(src_host, dst_host)

  It creates a server, resizes it, reverts the resize and then tries to
  ssh into the guest, which times out. I wonder if on the resize (or
  revert) we're losing the IP or failing to plug it properly.

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