Q:

Making RabbitMQ listen only to the loopback interface? 

How do I instruct the RabbitMQ processes (epmd and beam.smp) to listen only to the loopback interface (127.0.0.1)? 

A:

You sure can - edit your /etc/rabbitmq/rabbitmq.conf and add the line:
NODE_IP_ADDRESS=127.0.0.1 
you also probably want to add:
NODENAME=rabbit@localhost 
which will set your node to listen on localhost.