[Rdo-list] rdo-manager hostname issues with rabbitmq

Hi, there were a few different threads related to rdo-manager and encountering rabbitmq errors related to the hostname when installing the undercloud. I was able to reproduce a couple different issues, and in my environment it came down to $HOSTNAME not matching the defined FQDN hostname. You could use hostnamectl to set a hostname, but that does not update $HOSTNAME in your current shell. rabbitmq-env, which is sourced at the start of rabbitmq-server, reads the hostname from $HOSTNAME in some scenarios, and then uses that value to define the rabbit node name. Therefore, if you have a mismatch between $HOSTNAME and the actual FQDN, things can go off the rails with rabbitmq. I've tried to address this issue in this patch: https://review.gerrithub.io/#/c/232052/ For the virt-setup, setting of the FQDN hostname and adding it to /etc/hosts will now be done automatically, with the instack.localdomain used. The hostname can always be redefined later if desired. For baremetal, I've added some notes to the docs to hopefully cover the requirements. -- -- James Slagle --