---
- hosts: nginx1:nginx2
  gather_facts: false
  tasks:
  # 取消 nginx 对该 tomcat 服务器的反代
  - import_role:
      name: nginx
    vars:
      task: disable_ip
      ip: "{{hostvars[host]['ansible_ssh_host']}}"

- hosts: "{{host}}"
  gather_facts: false
  tasks:
  # 停止 tomcat 服务
  - import_role:
      name: tomcat
    vars:
      task: stop_service
  # 更新 webapp
  - import_role:
      name: tomcat
    when: task_name|lower != "restart_service"
    vars:
      task: "{{task_name}}"
      app: "{{app_name}}"
  # 启动 tomcat 服务
  - import_role:
      name: tomcat
    vars:
      task: start_service

- hosts: nginx1:nginx2
  gather_facts: false
  tasks:
  # 启用 nginx 对 tomcat 服务器的反代
  - import_role:
      name: nginx
    vars:
      task: enable_ip
      ip: "{{hostvars[host]['ansible_ssh_host']}}"