Elixir: Set cookie and hostname for release created using mix escript.build

Question

When running iex interactively, one can use

iex --cookie <cookie> --name <hostname>

How do I set the same values for cookie and name when running an executable created using mix escript.build ?

I figured out that I need to create a vm.args file with the following contents

## Name of the node
-name name@host

## Cookie for distributed erlang
-setcookie cookie

So I created a vm.args file in the same directory as the executable file. But when I print Node.self() , I get :nonode@nohost .

So where do I store vm.args so that it is read by the executable?

Answer 1

As far as I know, vm.args is not read by escripts. You have (at least) 2 options:

1. Set these values in emu_args key passed to escript in project/0 in mix.exs :

    def project do [app: :m, ..., escript: [main_module: M, emu_args: ["-name foo@bar -setcookie baz"]]] end 

2. Parse the CLI arguments and set the values in your main function:

    defmodule M do def main([name, cookie]) do Node.start String.to_atom(name) Node.set_cookie String.to_atom(cookie) IO.inspect {Node.self, Node.get_cookie} end end 

    $ mix escript.build $ ./m foo@bar baz {:foo@bar, :baz}