$ service openstack-nova-api start
2015-03-03 15:05:06.402 3313 ERROR nova.wsgi [-] Could not bind to 0.0.0.0:8775
2015-03-03 15:05:06.402 3313 CRITICAL nova [-] error: [Errno 98] Address already in use
$ service openstack-nova-api status
openstack-nova-api dead but pid file exists\*