docker-compose.yml

version: '2.1'

# networks:
#   backend: {}

services:

  # abstract base class
  elixir-base:
    build:
      context: .
      dockerfile: Dockerfile.elixir-base
    volumes:
      - .:/workspace
    working_dir: /workspace
    environment:
      - REDIS_HOST=redis
      - REDIS_PORT=${REDIS_PORT}
      - REDIS_TTL=${REDIS_TTL}
      - COOKIE=SECRET
    restart: "no"
    env_file:
        - .env

  # redis: cluster registration and heartbeat tracker
  redis:
    image: redis
    ports:
      - ${REDIS_PORT}:${REDIS_PORT}
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:${REDIS_PORT}"]
      interval: 1m30s
      timeout: 10s
      retries: 3
    env_file:
        - .env

  # mix (elixir build tool) proxy/helpers: no need for elixir stack on dev host
  deps.get:
    extends: elixir-base
    command: mix deps.get
  compile:
    extends: elixir-base
    command: mix compile
  test:
    extends: elixir-base
    command: mix test --cover

  # worker: a.k.a Cluster.Worker in elixir world
  worker:
    extends: elixir-base
    command: bash worker.sh
    links:
      - redis
    environment:
      - MIX_ENV=worker

  # system monitor: display cluster statistics in a loop
  sysmon:
    extends: elixir-base
    command: bash sysmon.sh
    ports:
      - 5984:5984 # consolex webserver
    links:
      - redis
    environment:
      - MIX_ENV=sysmon

  # api: a web-based API
  api:
    extends: elixir-base
    command: bash api.sh
    expose:
      - 5983
      - 80
    depends_on:
      - redis
    # ports:
    #   - 5983:5983 # api webserver
    links:
      - redis
    environment:
      - MIX_ENV=api

  # load balancer
  lb:
    image: dockercloud/haproxy
    depends_on:
      - api
    environment:
      - ADDITIONAL_SERVICES=${COMPOSE_PROJECT_NAME}:api
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    ports:
      - 80:80

  # system monitor: display cluster statistics in a loop
  loader:
    extends: elixir-base
    command: bash loader.sh
    links:
      - redis
    environment:
      - MIX_ENV=sysmon

  # command shell: agent loop + iex terminal
  shell:
    extends: elixir-base
    stdin_open: true
    tty: true
    command: bash shell.sh
    environment:
      - MIX_ENV=shell
    links:
      - redis

  # WIP: doesn't work without X11 forwarding and XQuartz
  # observer:
  #   extends: elixir-base
  #   stdin_open: true
  #   tty: true
  #   command: iex -S mix run -e ":observer.start"
  #   environment:
  #     - MIX_ENV=shell
  #     - DISPLAY=:0.0
  #   volumes:
  #     - /tmp/.X11-unix:/tmp/.X11-unix
  #     - ~/.Xauthority:/root/.Xauthority
  #   network_mode: "host"