Starting Corosync

Corosync is started as a regular system service. Depending on your distribution, it may ship with a LSB (System V style) init script, an upstart job, or a systemd unit file. Either way, the service is usually named corosync:

You can now check the Corosync connectivity with two tools.

The corosync-cfgtool utility, when invoked with the -s option, gives a summary of the health of the communication rings:

# corosync-cfgtool -s
Printing ring status.
Local node ID 435324542
RING ID 0
        id      = 192.168.42.82
        status  = ring 0 active with no faults
RING ID 1
        id      = 10.0.42.100
        status  = ring 1 active with no faults

The corosync-objctl utility can be used to dump the Corosync cluster member list:

# corosync-objctl runtime.totem.pg.mrp.srp.members
runtime.totem.pg.mrp.srp.435324542.ip=r(0) ip(192.168.42.82) r(1) ip(10.0.42.100)
runtime.totem.pg.mrp.srp.435324542.join_count=1
runtime.totem.pg.mrp.srp.435324542.status=joined
runtime.totem.pg.mrp.srp.983895584.ip=r(0) ip(192.168.42.87) r(1) ip(10.0.42.254)
runtime.totem.pg.mrp.srp.983895584.join_count=1
runtime.totem.pg.mrp.srp.983895584.status=joined

You should see a status=joined entry for each of your constituent cluster nodes.