title: nova ERROR: [Errno 111] Connection refused
body: <p>I'm using Centos 6.5 x86_64 to setup Openstack Havana and all services work well. But when I've rebooted the operating system, I've founded that the  nova service does not work properly, the following error triggered:</p>
  
  <pre><code>nova flavor-list
  ERROR: [Errno 111] Connection refused
  </code></pre>
  
  <p>Reviewing the log files in / var / log / nova gives the following error: </p>
  
  <pre><code>2014-03-24 12:24:04.293 6275 INFO nova.osapi_compute.wsgi.server [-] (6275) wsgi starting up  
  2014-03-24 12:24:04.297 6267 CRITICAL nova [-] [Errno 98] Address already in use 
  2014-03-24 12:24:04.412 6275 INFO nova.openstack.common.service [-] Parent process has died unexpectedly, exiting 
  2014-03-24 12:24:04.412 6274 INFO nova.openstack.common.service [-] Parent process has died unexpectedly, exiting 
  2014-03-24 12:24:04.412 6275 INFO nova.wsgi [-] Stopping WSGI server. 
  2014-03-24 12:24:04.412 6274 INFO nova.wsgi [-] Stopping WSGI server.
  </code></pre>
  
  <p>The state of my  OpenStack server</p>
  
  <pre><code>nova-manage service list
  
  Binary           Host                                 Zone             Status     State Updated_At
  nova-cert        controller                           internal         enabled    :-)   2014-03-24 14:28:03
  nova-consoleauth controller                           internal         enabled    :-)   2014-03-24 14:28:01
  nova-scheduler   controller                           internal         enabled    :-)   2014-03-24 14:28:00
  nova-conductor   controller                           internal         enabled    :-)   2014-03-24 14:27:59
  nova-compute     controller                           nova             enabled    :-)   2014-03-24 14:28:06
  nova-network     controller                           internal         enabled    :-)   2014-03-24 14:27:58
  
  keystone service-list
  
  +----------------------------------+----------+----------+---------------------------+
  |                id                |   name   |   type   |        description        |
  +----------------------------------+----------+----------+---------------------------+
  | 7ce108d652ee48d7897127045a371795 |  cinder  |  volume  |   Cinder Volume Service   |
  | 9452b875328f4763b7766eb533bd75c4 | cinderv2 | volumev2 |  Cinder Volume Service V2 |
  | e9607d1a308140298f8364fd2a0e62a8 |  glance  |  image   |    Glance Image Service   |
  | b7ac07f69e2e41f684d6470c69db4781 | keystone | identity | Keystone Identity Service |
  | cbdfa73329094d7d94c7464b9bf0ef7d |   nova   | compute  |    Nova Compute service   |
  +----------------------------------+----------+----------+---------------------------+
  
  ps -ef | grep "nova-api"
  
  nova      2522     1  0 11:22 ?        00:00:00 /usr/bin/python /usr/bin/nova-api-metadata --logfile /var/log/nova/metadata-api.log
  root     11909  6217  0 15:11 pts/1    00:00:01 gedit nova-api.log
  root     12644  3832  0 15:31 pts/0    00:00:00 grep nova-api
  
  
  netstat -napo | grep 877
  
  tcp        0      0 0.0.0.0:8775                0.0.0.0:*                   LISTEN      2522/python         off (0.00/0/0)
  </code></pre>
  
  <p>Any pointers would be extremely helpful.</p>
  
  <p>Thanks</p>