Elixir - Deploy with mix_docker, Distillery, Docker and k8s

config.exs

# rel/config.exs
use Mix.Releases.Config,
  default_release: :myapp,
  default_environment: Mix.env

environment :dev do
  set dev_mode: true 
  set include_erts: false
  set include_system_libs: false
  set cookie: :dev
end

environment :prod do
  set include_erts: true
  set include_system_libs: true
  set cookie: :prod
end

# Regular app:
release :foo do
  set version: current_version(:foo)
end

# Umbrella app:
release :myapp do
  set version: "0.1.0"
  set applications: [:app_a, app_b: :permanent, some_dep: :load]
end

Dockerfile.build

FROM elixir:1.4.2

ENV DEBIAN_FRONTEND=noninteractive
ENV HOME=/opt/app/ TERM=xterm

# Install Hex+Rebar
RUN mix local.hex --force && \
    mix local.rebar --force

WORKDIR /opt/app

ENV MIX_ENV=prod REPLACE_OS_VARS=true

# Cache elixir deps
COPY mix.exs mix.lock ./
RUN mix deps.get

COPY config ./config
RUN mix deps.compile

COPY . .

RUN mix release --env=prod

Dockerfile.release

FROM elixir:1.4.2
ENV DEBIAN_FRONTEND=noninteractive

EXPOSE 8000
ENV PORT=8000 MIX_ENV=prod REPLACE_OS_VARS=true SHELL=/bin/bash

WORKDIR /app
COPY ./myapp.tar.gz ./
RUN tar xfz myapp.tar.gz

ENTRYPOINT ["bin/myapp"]