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openstack-nova-compute dosen't start??

hi to all I'am installing openstack as mention in the instruction book when I try to start the compute service in compute node systemctl start openstack-nova-compute.service it 's just freeze
I check to conf file many time I am sure that every thing is OK this the Log file in the Compute Node

2015-10-13 19:48:20.429 1280 ERROR oslo_messaging._drivers.impl_rabbit [req-4391b5d6-dcbb-4aee-9823-e499041eec9c - - - - -] AMQP server controller:5672 closed the connection. Check login credentials: Socket closed
2015-10-13 19:48:24.450 1280 ERROR oslo_messaging._drivers.impl_rabbit [req-4391b5d6-dcbb-4aee-9823-e499041eec9c - - - - -] AMQP server controller:5672 closed the connection. Check login credentials: Socket closed
2015-10-13 19:48:28.471 1280 ERROR oslo_messaging._drivers.impl_rabbit [req-4391b5d6-dcbb-4aee-9823-e499041eec9c - - - - -] AMQP server controller:5672 closed the connection. Check login credentials: Socket closed
2015-10-13 19:48:32.490 1280 ERROR oslo_messaging._drivers.impl_rabbit [req-4391b5d6-dcbb-4aee-9823-e499041eec9c - - - - -] AMQP server controller:5672 closed the connection. Check login credentials: Socket closed
2015-10-13 19:48:36.508 1280 ERROR oslo_messaging._drivers.impl_rabbit [req-4391b5d6-dcbb-4aee-9823-e499041eec9c - - - - -] AMQP server controller:5672 closed the connection. Check login credentials: Socket closed
2015-10-13 19:48:40.526 1280 ERROR oslo_messaging._drivers.impl_rabbit [req-4391b5d6-dcbb-4aee-9823-e499041eec9c - - - - -] AMQP server controller:5672 closed the connection. Check login credentials: Socket closed

and the rabbitMG Log in the controller

=ERROR REPORT==== 13-Oct-2015::19:48:57 ===
closing AMQP connection <0.3808.0> (10.10.10.10:40273 -> 10.10.10.10:5672):
{handshake_error,starting,0,
                 {amqp_error,access_refused,
                             "AMQPLAIN login refused: user 'openstack' - invalid credentials",
                             'connection.start_ok'}}

> should I Install rabbitmq-server in the compute node or just in the controller Thanks .. alot