I want to make a hot-swapping elixir code using edeliver and distillary but without phoenix.
This is my code :

defmodule Countup do
  use GenServer

  def start_link do
    GenServer.start_link(__MODULE__, 1)
  end

  def init(state) do
    send(self(), {:increment, 2})
    {:ok, state}
  end

  def handle_info({:increment, value}, state) do
    mystate = state + value
    IO.puts(mystate)
    Process.send_after(self(), {:increment, value}, 1_000)
    {:noreply, mystate}
  end

end

I am using :

{:edeliver, "~> 1.6"},
{:distillery, "~> 2.0"} 

and learn the step from :
https://www.digitalocean.com/community/tutorials/how-to-automate-elixir-phoenix-deployment-with-distillery-and-edeliver-on-ubuntu-16-04

Well, “response : recieve pang” already show up in this forum at :
https://forum.elixirforum.com/t/mix-edeliver-start-production-cookie-mismatch-help/15937/13
I succeeded (do hot swapping) when using phoenix but failed when I didn’t use phoenix (in this code)

when I excecute ‘mix edeliver start production’, it result :

EDELIVER COUNTUP WITH START COMMAND

-----> starting production servers

production node:

  user    : sammy
  host    : example.com
  path    : /home/sammy/app_release
  response: ▸  Received 'pang' from countup@127.0.0.1!
▸  Possible reasons for this include:
▸    - The cookie is mismatched between us and the target node
▸    - We cannot establish a remote connection to the node
▸  Received 'pang' from countup@127.0.0.1!
▸  Possible reasons for this include:
▸    - The cookie is mismatched between us and the target node
▸    - We cannot establish a remote connection to the node


START DONE!

Any suggestions, reading or ways to navigate this?