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

  dockergen:
    image: nginxproxy/docker-gen
    command: -notify-sighup nginx -watch /etc/docker-gen/templates/nginx.tmpl /etc/nginx/conf.d/default.conf
    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