nginx-proxy/docker-compose-separate-containers.yml

volumes:
  nginx_conf:

services:
  nginx:
    image: nginx
    container_name: nginx
    ports:
      - "80:80"
    volumes:
      - nginx_conf:/etc/nginx/conf.d:ro
      - network_internal.conf:/etc/nginx/network_internal.conf:ro

  dockergen:
    image: nginxproxy/docker-gen
    command: -notify-sighup nginx -watch /etc/docker-gen/templates/nginx.tmpl /etc/nginx/conf.d/default.conf
    # the name "nginx" passed to the "-notify-sighup" flag must exactly match the container name used for the nginx container above.
    environment:
      # nginx-proxy environment variable (HTTP_PORT etc.) must be set on the docker-gen container (not the nginx container)  
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro
      - ./nginx.tmpl:/etc/docker-gen/templates/nginx.tmpl
      - nginx_conf:/etc/nginx/conf.d

  whoami:
    image: jwilder/whoami
    environment:
      - VIRTUAL_HOST=whoami.example