freeCodeCamp/docker-compose.yml

services:
  mongo:
    image: mongo
    ports:
      - '27017:27017'
    command: mongod --replSet rs0
  setup:
    image: mongo
    depends_on:
      - mongo
    restart: on-failure
    entrypoint: [
        'bash',
        '-c',
        # This will try to initiate the replica set, until it succeeds twice (i.e. until the replica set is already initialized)
        'mongosh --host mongo:27017 --eval ''try {rs.initiate();} catch (err) { if(err.codeName !== "AlreadyInitialized") throw err };'''
      ]
  mailpit:
    restart: unless-stopped
    image: axllent/mailpit
    ports:
      - '1025:1025'
      - '8025:8025'
  api:
    restart: unless-stopped
    depends_on:
      - mongo
      - mailpit
    image: fcc-api
    env_file:
      - .env
    environment:
      # The api cannot connect to mongodb or mailpit via localhost from inside the
      # container, so we have to override these variables.
      - MONGOHQ_URL=mongodb://mongo:27017/freecodecamp?directConnection=true
      - MAILHOG_HOST=mailpit
      - HOST=0.0.0.0
    ports:
      - '3000:3000'