epmdlessless

This example project is part of blog post Running Erlang Releases without EPMD on OTP 23.1+.

Build and Run

A docker-compose.yml file is provided, along with a Dockerfile, which will build the Docker image and start 3 nodes (node_a, node_b, node_c). Simply run up to build the images and start the 3 nodes:

$ docker-compose up

Clustering Nodes

Use docker exec to open a remote shell on node_a and connect to node_b:

$ docker exec -ti node_a bin/epmdlessless remote_console
Erlang/OTP 23 [erts-11.1.3] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe]

Eshell V11.1.3  (abort with ^G)
(epmdlessless@node_a)1> net_kernel:connect_node(epmdlessless@node_b).
true
(epmdlessless@node_a)2> nodes().
[epmdlessless@node_b]

Do the same on node_c and also connect to node_b and you'll see the full mesh is created with node_a:

$ docker exec -ti node_c bin/epmdlessless remote_console
Erlang/OTP 23 [erts-11.1.3] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe]

Eshell V11.1.3  (abort with ^G)
(epmdlessless@node_c)1> net_kernel:connect_node(epmdlessless@node_b).
true
(epmdlessless@node_c)2> nodes().
[epmdlessless@node_b,epmdlessless@node_a]