Mix release cannot auto discover new node

Questions & Help Questions
1

After upgrading from elixir 1.6 and distillery to elixir 1.11 and mix release, nodes in cluster are no longer auto joining each other.

  1. def start(_, _), do: :net_adm.world() is in defmoudle MyApp.application
  2. .hosts.erlang is loaded properly and contains all IPs
iex(prod@myapp-upgrade-group-wfs3)2> :net_adm.host_file
[:"10.152.0.56", :"10.152.15.238", :"10.152.0.20", :"10.152.0.17"]

  1. Node.list returns [] but doing a Node.ping(:"prod@myapp-upgrade-group-another_node") and they will join each other and Node.list would returns properly.

  2. There is no rel directory in my project now but I did have one for distillery. This is the biggest difference I can think of.

2

The problem is indeed due to the missing of rel/env.sh.eex. More specifically, the missing of these two lines

+export RELEASE_DISTRIBUTION=name
+export RELEASE_NODE=<%= @release.name %>@${HOSTNAME}