Installing rabbitmq-server and starting it, it does not work at all.

Apr 15 15:28:48 controller rabbitmqctl[1216]: Waiting for rabbit@controller ...
Apr 15 15:28:48 controller rabbitmqctl[1216]: pid is 1226 ...
Apr 15 15:28:48 controller rabbitmqctl[1216]: Error: process_not_running
Apr 15 15:28:48 controller rabbitmqctl[1318]: Stopping and halting node
rabbit@controller ...
Apr 15 15:28:48 controller rabbitmqctl[1318]: Error: unable to connect to node
rabbit@controller: nodedown
Apr 15 15:28:48 controller rabbitmqctl[1318]: DIAGNOSTICS
Apr 15 15:28:48 controller rabbitmqctl[1318]: ===========
Apr 15 15:28:48 controller rabbitmqctl[1318]: attempted to contact:
[rabbit@controller]
Apr 15 15:28:48 controller rabbitmqctl[1318]: rabbit@controller:
Apr 15 15:28:48 controller rabbitmqctl[1318]: * unable to connect to epmd (port
4369) on controller: address (cannot connect to ho
Apr 15 15:28:48 controller rabbitmqctl[1318]: current node details:
Apr 15 15:28:48 controller rabbitmqctl[1318]: - node name:
'rabbitmq-cli-1328@controller'
Apr 15 15:28:48 controller rabbitmqctl[1318]: - home dir: /var/lib/rabbitmq
Apr 15 15:28:48 controller rabbitmqctl[1318]: - cookie hash:
aJJARUM7cjrUzvfp86VwKg==


I got this fixed with having epmd listening to my external address (on
controller) and not only on localhost.

Fixed with:
cp /usr/lib/systemd/system/epmd.socket /etc/systemd/system/
edit /etc/systemd/system/epmd.socket and add a second Listen line like:
ListenStream=192.168.0.11:4369

(this is my controller IP address)

and everything is ifne