Gluster error: Host is not in 'Peer in Cluster' state

[peter_b]

[PROBLEM]
I tried to create a GlusterFS volume, but got the following error message:

volume create: dlp-storage: failed: Host <hostname> is not in 'Peer in Cluster' state

[SOLUTION]
Well, yes: The error message was exactly right:
I chose the wrong host, which had no glusterd running

I simply corrected the "<hostname>" in my "gluster volume create" statement to point at the correct gluster server.