Binding epmd to a specific interface/IP

[Roy]

Hi Support, Is it possible to configure RabbitMQ to use a specific interface/ip for epmd (port 4369)?. Right now it is bound to all interfaces (0.0.0.0) even after setting ERL_EPMD_ADDRESS to a specific IP within the rabbitmq_advanced.conf. I also tried "export ERL_EPMD_ADDRESS=<specific-ip>" and restarting the service from the shell to see that the port 4369 is still bound to 0.0.0.0 (see below). I am using erlang v25.0.4 and rabbitmq-server v3.11.13. 

Thanks for your help in advance. 

$ netstat -anlp | grep 4369 tcp 0 0 0.0.0.0:4369 0.0.0.0:* LISTEN 14292/epmd tcp 0 0 127.0.0.1:43290 127.0.0.1:4369 TIME_WAIT - tcp 0 0 10.10.120.12:4369 10.10.120.12:53500 TIME_WAIT - tcp 0 0 127.0.0.1:41386 127.0.0.1:4369 ESTABLISHED 19674/beam.smp tcp 0 0 127.0.0.1:4369 127.0.0.1:41386 ESTABLISHED 14292/epmd
Thanks

[Luke Bakken]

Hello,

Restarting the service won't restart epmd, plus epmd won't pick up the ERL_EPMD_ADDRESS environment variable since I'm assuming you are using systemd.

You should create the /etc/rabbitmq/rabbitmq-env.conf file with the following contents:

export ERL_EPMD_ADDRESS=<specific-ip>

Then, stop the RabbitMQ service, and kill any running epmd processes. Then, restart the RabbitMQ service. epmd should pick up the value of ERL_EPMD_ADDRESS from the environment.

If not, let me know.

Thanks,

Luke