Hello,
I think that, by default, in /etc/sysconfig/eos_env, EOS_BROKER_URL is set to root://localhost:1097//eos/.
I read that the FQDN can be used (EOS_BROKER_URL :: why localhost?).
But what if I set it to a cluster alias (a DNS entry that points to both managers) ? Is it OK or could it create issues ?
The broker should always point to the localhost. The client inside the MGM is handling all the logic to properly connect to the real MQ master daemon which for a master-slave setup can sometimes be on another machine. Putting an alias instead will confuse the XRootD client used by the MGM to register to messages from MQ.