docker-compose.yml

version: "2"
services:
  nginx:
    build: ./nginx
    links:
      - node1:node1
      - node2:node2
      - node3:node3
    ports:
      - "80:80"

  node1:
    build: ./nodejs
    links:
      - db
    environment:
      PORT: 4000
      SECRET: secret
      ACCESS_TOKEN_EXPIRES: 24h
      DB_CONNECTION: postgres://postgres:pass@db:5432/nodejs_reverse_proxy_example
      NODE_ENV: "production"
    ports:
      - "4000:4000"

  node2:
    build: ./nodejs
    links:
      - db
    environment:
      PORT: 4000
      SECRET: secret
      ACCESS_TOKEN_EXPIRES: 24h
      DB_CONNECTION: postgres://postgres:pass@db:5432/nodejs_reverse_proxy_example
      NODE_ENV: "production"
    ports:
      - "4001:4000"

  node3:
    build: ./nodejs
    links:
      - db
    environment:
      PORT: 4000
      SECRET: secret
      ACCESS_TOKEN_EXPIRES: 24h
      DB_CONNECTION: postgres://postgres:pass@db:5432/nodejs_reverse_proxy_example
      NODE_ENV: "production"
    ports:
      - "4002:4000"

  db:
    image: postgres:latest
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=pass
      - POSTGRES_DB=nodejs_reverse_proxy_example
    ports:
      - "5432:5432"