Where do I find files specific to a user?

I've been having a problem connecting to my rabbitmq server when I start it on my local machine. Apparently the erlang cookie of the server, running on my local machine, does not match the cookie on my local machine. I found an old post on the internet explaining that such a problem when running on a local machine can be caused by the fact that I'm not running rabbitmq as a rabbitmq user which is created for you by the installer. So I did just that and started rabbitmq as rabbitmq user, with the following command. sudo -H -u rabbitmq bash /usr/lib/rabbitmq/bin/rabbitmq-server How does it really work? Since I don't have a dedicated folder for the user rabbitmq I want to understand where erlang cookie can be saved for the mentioned user, so that it does not match the cookie inside MY home folder (it IS there). Also I would like to know how the command --set-home would work in the context of the given command given such user does not (to my understanding) have a home directory.