Docker Compose for MERN Stack

services:
  app:
    build: .
    ports:
      - target: 3000
        mode: ingress
    environment:
      - MONGODB_URI=mongodb://admin:${MONGO_INITDB_ROOT_PASSWORD}@db:27017/app?authSource=admin
      - NODE_ENV=production
    healthcheck:
      test:
        - CMD
        - curl
        - -f
        - http://localhost:3000/
      interval: 30s
      timeout: 5s
      retries: 3
    depends_on:
      - db
    deploy:
      resources:
        reservations:
          cpus: "0.5"
          memory: 256M
    restart: unless-stopped
  db:
    image: mongo:7
    ports:
      - target: 27017
        mode: host
    environment:
      - MONGO_INITDB_ROOT_USERNAME=admin
      - MONGO_INITDB_ROOT_PASSWORD=${MONGO_INITDB_ROOT_PASSWORD}
    healthcheck:
      test:
        - CMD
        - mongosh
        - --eval
        - db.adminCommand('ping')
      interval: 10s
      timeout: 5s
      retries: 5
    deploy:
      resources:
        reservations:
          cpus: "0.5"
          memory: 256M
    restart: unless-stopped
    x-defang-mongodb: true