[ClusterLabs] how to setup single node cluster

[d tbsky]

Reid Wahl <nwahl at redhat.com>
> Disaster recovery is the main use case we had in mind. See the RHEL 8.2 release notes:
>   - https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.2_release_notes/rhel-8-2-0-release#enhancement_high-availability-and-clusters
>
> I thought I also remembered some other use case involving MS SQL, but I can't find anything about it so I might be remembering incorrectly.

thanks a lot for confirmation. according to the discussion above, I
think the setup procedure is similar for singe-node cluster. I should
still use corosync (although it seems sync nowhere).
I will try that when I have time.
thanks again for your kindly help!