Dockerizing a Node.js and MongoDB app with CI/CD Pipelines on Gitlab for staging and production environments.

docker-compose.yml

version: '3'

services:
  local:
    restart: always
    container_name: local
    volumes:
      - ./config-dev.js:/app/config.js
      - .:/app
    build: .
    ports:
      - "3000:80"
    networks:
      - mongo
    depends_on:
      - mongo
      
  dev:
    restart: always
    container_name: dev
    volumes:
      - ./config-dev.js:/app/config.js
    image: registry.gitlab.com/USER/PROJECT/IMAGE-dev:latest
    ports:
      - "3000:80"
    networks:
      - mongo
    depends_on:
      - mongo      

  prod:
    restart: always
    container_name: prod
    volumes:
      - ./config-prod.js:/app/config.js
    image: registry.gitlab.com/USER/PROJECT/IMAGE-prod:latest
    ports:
      - "3033:80"
    networks:
      - mongo
    depends_on:
      - mongo

  mongo:
    restart: always
    container_name: mongo
    image: mongo
    volumes:
      - /var/lib/mongodb:/data/db
    ports:
      - "27017:27017"
    networks:
      - mongo


networks:
  mongo:
    external:
      name: mongo