docker app Dockerfile

FROM elixir:latest

RUN mix local.hex --force
RUN mix local.rebar --force
RUN mix archive.install https://github.com/phoenixframework/archives/raw/master/phoenix_new.ez --force

RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
RUN apt-get update && apt-get install -y postgresql-client inotify-tools nodejs

RUN mkdir /app
COPY . /app
WORKDIR /app

docker postgres setup.sh

#!/bin/bash

# Create, migrate, and seed database if it doesn't exist.
if [[ -z `psql -U $POSTGRES_USER -Atqc "\\list merchant"` ]]; then
    echo "Database merchant does not exist. Creating..."
    createdb -U $POSTGRES_USER -E UTF8 merchant -l en_US.UTF-8 -T template0
    mix ecto.migrate
    mix run priv/repo/seeds.exs
    echo "Database merchant created."
fi

docker-compose.yml

version: '3'

services:
  app:
    build:
      context: .
      dockerfile: docker/app/Dockerfile
    working_dir: /app
    command: mix phx.server
    environment:
      PGUSERNAME: postgres
      PGPASSWORD: postgres
      PGDATABASE: merchant
      PGHOSTNAME: database
      PGPORT: 5432
    ports:
      - 4000:4000
    volumes:
      - .:/app
    links:
      - postgres:database
  postgres:
    image: postgres:9.6
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
      PGDATA: /var/lib/postgres/data/pgdata
    restart: always
    volumes:
      - ./docker/postgres:/docker-entrypoint-initdb.d
      - pgdata:/var/lib/postgresql/data
volumes:
  pgdata: