Hey folks, I would like help to connect Livebook to an Elixir node running in a Docker container.

To run the container I usually do

docker-compose run --rm --service-ports api iex -S mix

and Livebook

docker run -p 8080:8080 -p 8081:8081 --pull always -u $(id -u):$(id -g) -v $(pwd):/data ghcr.io/livebook-dev/livebook:nightly

as described in the docs.

Now I want to attach a new notebook to the running app. If I got it right, for the node to be visible to Livebook, it must be running in the same network and have a known RELEASE_NODE and RELEASE_COOKIE. For that, I tried following this gist, this thread and also this discussion, but got no luck.

This is what I tried:

docker-compose run \
  --rm \
  --service-ports \
  -e RELEASE_DISTRIBUTION="name" \
  -e RELEASE_NODE="api@127.0.0.1" \
  -e RELEASE_COOKIE="mycookie" \
  api \
  iex --name api@127.0.0.1 --cookie mycookie -S mix

docker run \
  -p 8080:8080 \
  -p 8081:8081 \
  --pull always \
  -u $(id -u):$(id -g) \
  -v $(pwd):/data \
  --network $API_NETWORK \
  -e LIVEBOOK_NODE="livebook@127.0.0.1" \
  -e LIVEBOOK_DISTRIBUTION=name \
  -e LIVEBOOK_DEFAULT_RUNTIME="attached:api@127.0.0.1:mycookie" \
  ghcr.io/livebook-dev/livebook:nightly

What am I missing?