I'm afraid there isn't much we can suggest from this single line problem definition.
When RabbitMQ is installed using the Debian package, forming a cluster on that machine will be problematic because the node
is configured in a way that does not make it easy to override node data directory, and so on.
Consider using Docker with Docker Swarm, our Kubernetes Operator with kind or at least the generic binary build [1] which you can run from anywhere without sudo.