Description of problem: After reinstallation builder203 on AWS does not have a valid hostname set and hence it's network service might behave weird.
Can you be a bit more specific on: - what network do behave weirdly ? I also did set the hostname (using hostnamectl), so maybe this requires a reboot, and/or a different hostname.
So, answering to myself, rpc.statd didn't start after reboot, and the hostname was ip-172-31-38-158.us-east-2.compute.internal. After "hostnamectl set-hostname builder203.int.aws.gluster.org", that's better; Guess we need to automate that (as I used builder203.aws.gluster.org and this was wrong).
Misc did set it up. Closing this one.