What ports does RabbitMQ use?

Question

What ports does RabbitMQ Server use or need to have open on the firewall for a cluster of nodes?

My /usr/lib/rabbitmq/bin/rabbitmq-env is set below whic

Answer 1

To find out what ports rabbitmq uses:

$ epmd -names

Outputs:

epmd: up and running on port 4369 with data:
name rabbit at port 25672

Run these as root:

lsof -i :4369
lsof -i :25672

More about epmd options.