Epmd and systemd
By default the epmd on (open)SUSE only listens on 127.0.0.1. Which in itself is a sane default policy. We don’t expose any services directly to everyone just because we install and run them. But if you want to cluster erlang services you need it to listen on more addresses.
$ export EDITOR=vim $ systemctl edit epmd.socket
Add the following content:
[Socket] # unset all ports defined in the global file, in our case this is 127.0.0.1:4369 ListenStream= # add our new ports ListenStream=[::]:4369
systemctl daemon-reload systemctl restart epmd.socket epmd.service
Verify our work:
$ ss -tulpen | grep epmd tcp LISTEN 0 128 :::4369 :::* \ users:(("epmd",pid=30655,fd=3),("systemd",pid=1,fd=27)) \ ino:31224577 sk:30 v6only:0 <->