Phoenix project dockerized

docker-compose.yml

version: "3"
services:
  web:
    build: .
    volumes:
      - ".:/app"
    ports:
      - "4000:4000"
    command: "iex -S mix phx.server"
  db:
    image: "postgres:10.0"
    environment:
      POSTGRES_DB: "<my-project-name>_dev"

Dockerfile

FROM elixir:1.5.0

WORKDIR /app

# Install Hex
RUN mix local.hex --force

# Install rebar3
# Needed to compile dependency :ranch
RUN mix local.rebar --force

# Install Phoenix archive
RUN mix archive.install --force https://github.com/phoenixframework/archives/raw/master/phx_new.ez

RUN apt-get update

## Workaround to install Node and NPM:
# https://github.com/npm/npm/issues/17996
#
# install outdated stock npm, than use it to upgrade itself to the intermediate version
RUN apt-get install -y npm && \
      npm install -g npm@4.3.0 && \
      ln -s /usr/bin/nodejs /usr/bin/node

# upgrade node via npm by installing n and using it to manage nodes
RUN npm install -g n && n latest

# Install inotify
# Watcher that Phoenix uses for live code reloading
RUN apt-get install -y inotify-tools