docker-compose.yaml

version: '3.7'
services:
    nginx:
      image: nginx
      deploy:
            replicas: 4
      ports:
        - target: 80
          published: 80
          protocol: tcp
      volumes:
      - type: bind
        source: ./nginx/nginx.conf
        target: /etc/nginx/nginx.conf
    service1:
        build:
            context: ./service1
            dockerfile: Dockerfile
        image: wasimd/service1
        deploy:
          replicas: 4
        ports:
        - target: 5000
          published: 5000
          protocol: tcp
        environment:
          DATABASE_URI: ${DATABASE_URI}
    service2:
        build:
            context: ./service2
            dockerfile: Dockerfile
        image: wasimd/service2
        deploy:
          replicas: 4
        ports:
        - target: 5001
          published: 5001
          protocol: tcp
    service3:
        build:
            context: ./service3
            dockerfile: Dockerfile
        image: wasimd/service3
        deploy:
          replicas: 4
        ports:
        - target: 5002
          published: 5002 
          protocol: tcp
    service4:
        build:
            context: ./service4
            dockerfile: Dockerfile
        image: wasimd/service4
        deploy:
          replicas: 4
        ports:
        - target: 5003
          published: 5003
          protocol: tcp