Thanks for responding to the query.
I am looking for a way to use the existing instance and upgrade erlang in the same system. Is there a way to achieve this?
Also we have a cluster of 2 RabbitMQ instances. So if we are launching new instance, and migrate the required files (var, etc, and rabbitmq_home) would the instances join the cluster after launch? Or do we need to manually join them to the cluster?