Need help: Super basic libcluster example using docker

[polygonpusher]

I’m trying to stand up a very basic example of distributed elixir using docker and epmd.

I chose to use libcluster and followed the readme with the example of the two nodes a@127.0.0.1 and b@127.0.0.1

Heres the app in github here GitHub - joshchernoff/cluster_example: A very basic example of using distributed elixir with LiveView and docker-compose

In short, everything works besides libcluster.
I can manually connect the nodes via Node.connect and list the nodes by hand but when running libcluster I get

Any ideas?

If I had to guess I would think its related to something running too soon. IE maybe I need to wait to boot the other container first before the other?

I’m hoping I just overlooked something basic.

[polygonpusher]

I was mistaken I can’t Node.connect by hand after all. I was connecting the node to the same app thus is was saying true, I didn’t notice I was giving the wrong node name to connect to. When trying to use the correct node name I found it would return false thus the prob here is likely epmd is not able to connect because of docker.

[Exadra37]

See this other topic to see if addresses your issue:

Connect nodes using Libcluster with docker-compose

So, let’s start with the manual connection in docker. Once it works on your side we can move to libcluster We run two iex in two different containers, connected to the same elixir network and passing the same ERLANG_COOKIE via env variable First let’s create the bridge network (something that docker-compose creates automatically) docker network create elixir Then run the first container in a terminal, attaching it to the elixir network. The container’s name is app1 which is…