Troubleshooting common OpenStack errors

First of all, check that all Nova services are in a stable state:

$nova-manage service list
Binary Host Zone Status State Updated_At
nova-scheduler openstack1 nova enabled : – ) 2012-05-12 22:42:14
nova-compute openstack1 nova enabled : – ) 2012-05-12 22:42:12
nova-network openstack1 nova enabled : – ) 2012-05-12 22:42:14

Secondly, check that all nova processes are running:

$ ps -ea | grep nova
11448 ? 00:02:54 nova-cert
12072 ? 00:02:57 nova-network
12083 ? 00:10:31 nova-compute
12093 ? 00:06:40 nova-api
12117 ? 00:02:26 nova-scheduler
12154 ? 00:00:00 nova-xvpvncprox
55746 ? 00:00:00 nova-objectstor

For further insight into any errors, the log files are very helpful. The following command can be used to see the logs files:

$tail -n 400 /var/log/nova-compute

Error – internal error Failed to create mDNS client: Daemon not running

The following is the error output displayed while starting the libvirt daemon:

The solution

The problem is that the libvirt...