docker-compose.yml

version: '3.8'
services:
  app1:
    image: nginx:alpine
    ports:
      - "8101:80"
    networks:
      mynetwork:
        ipv4_address: 10.10.0.2
    command: /bin/sh -c "echo '<h1>APP 1</h1>' > /usr/share/nginx/html/index.html; nginx -g 'daemon off;'"

  app2:
    image: nginx:alpine
    ports:
      - "8102:80"
    networks:
      mynetwork:
        ipv4_address: 10.10.0.3

    command: /bin/sh -c "echo '<h1>App 2</h1>' > /usr/share/nginx/html/index.html; nginx -g 'daemon off;'"

  app3:
    image: nginx:alpine
    ports:
      - "8103:80"
    networks:
      mynetwork:
        ipv4_address: 10.10.0.4
    command: /bin/sh -c "echo '<h1>app 3</h1>' > /usr/share/nginx/html/index.html; nginx -g 'daemon off;'"

  lb:
    image: nginx:alpine
    volumes:
      - "./lb-conf/default.conf:/etc/nginx/conf.d/default.conf"
    networks:
      mynetwork:
        ipv4_address: 10.10.0.5
    ports:
      - "8100:80"
    command: /bin/sh -c "nginx -g 'daemon off;'"


networks:
  mynetwork:
    driver: bridge
    ipam:
      driver: default
      config:
        - subnet: 10.10.0.0/24