[ClusterLabs] how to setup single node cluster

[d tbsky]

Hi:
    I found RHEL 8.2 support single node cluster now.  but I didn't
find further document to explain the concept. RHEL 8.2 also support
"disaster recovery cluster". so I think maybe a single node disaster
recovery cluster is not bad.

   I think corosync is still necessary under single node cluster. or
is there other new style of configuration?

    thanks for help!