Comment 5 for bug 1625611

2016-09-20 11:17:05.584 ERROR [7fa4693c6880] (manager) Error occurred when running task
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/nailgun/task/manager.py", line 266, in _execute_async
    self._execute_async_content(supertask, **kwargs)
  File "/usr/lib/python2.7/site-packages/nailgun/task/manager.py", line 503, in _execute_async_content
    rpc.cast('naily', task_messages)
  File "/usr/lib/python2.7/site-packages/nailgun/rpc/__init__.py", line 97, in cast
    publish()
  File "/usr/lib/python2.7/site-packages/kombu/messaging.py", line 172, in publish
    routing_key, mandatory, immediate, exchange, declare)
  File "/usr/lib/python2.7/site-packages/kombu/messaging.py", line 177, in _publish
    channel = self.channel
  File "/usr/lib/python2.7/site-packages/kombu/messaging.py", line 194, in _get_channel
    channel = self._channel = channel()
  File "/usr/lib/python2.7/site-packages/kombu/utils/__init__.py", line 425, in __call__
    value = self.__value__ = self.__contract__()
  File "/usr/lib/python2.7/site-packages/kombu/messaging.py", line 209, in <lambda>
    channel = ChannelPromise(lambda: connection.default_channel)
  File "/usr/lib/python2.7/site-packages/kombu/connection.py", line 756, in default_channel
    self.connection
  File "/usr/lib/python2.7/site-packages/kombu/connection.py", line 741, in connection
    self._connection = self._establish_connection()
  File "/usr/lib/python2.7/site-packages/kombu/connection.py", line 696, in _establish_connection
    conn = self.transport.establish_connection()
  File "/usr/lib/python2.7/site-packages/kombu/transport/pyamqp.py", line 116, in establish_connection
    conn = self.Connection(**opts)
  File "/usr/lib/python2.7/site-packages/amqp/connection.py", line 165, in __init__
    self.transport = self.Transport(host, connect_timeout, ssl)
  File "/usr/lib/python2.7/site-packages/amqp/connection.py", line 186, in Transport
    return create_transport(host, connect_timeout, ssl)
  File "/usr/lib/python2.7/site-packages/amqp/transport.py", line 299, in create_transport
    return TCPTransport(host, connect_timeout)
  File "/usr/lib/python2.7/site-packages/amqp/transport.py", line 95, in __init__
    raise socket.error(last_err)
error: [Errno 111] Connection refused
2016-09-20 11:17:05.592 DEBUG [7fa4693c6880] (task) Updating task: 471500bf-d7f3-4384-ae21-0aec3db6ec57
2016-09-20 11:17:05.596 DEBUG [7fa4693c6880] (task) Updating cluster status: 471500bf-d7f3-4384-ae21-0aec3db6ec57 cluster_id: 1 status: error
2016-09-20 11:17:05.605 DEBUG [7fa4693c6880] (task) Updating cluster (TestMuranoPluginBvt (id=1, mode=ha_compact)) status: from operational to error

Mykola, you trying to upgrade the cluster with detach-murano plugin installed, the problem can be caused by the plugin, and actually the environment successfully deployed, but nailgun logs contain this error.