Ping

For help on a specific openstack messaging ping command, enter:

$ openstack messaging ping COMMAND -h/--help

The one command:

messaging ping

openstack messaging ping

usage: openstack messaging ping [-h] [-f {json,shell,table,value,yaml}]
                                [-c COLUMN] [--max-width <integer>]
                                [--noindent] [--prefix PREFIX]

Check if Zaqar server is alive or not.