如何编写具有多个任务的Ansible处理程序? [英] How do I write an Ansible handler with multiple tasks?

问题描述

为响应更改，我有多个应运行的相关任务. 如何编写具有多个任务的Ansible处理程序?

In response to a change, I have multiple related tasks that should run. How do I write an Ansible handler with multiple tasks?

例如，我希望处理程序仅在已经启动时重新启动服务:

For example, I would like a handler that restarts a service only if already started:

- name: Restart conditionally
  shell: check_is_started.sh
  register: result

- name: Restart conditionally step 2
  service: name=service state=restarted
  when: result

推荐答案

从Ansible 2.2开始，有适当的解决方案.

There is proper solution to this problem as of Ansible 2.2.

处理程序还可以侦听"一般主题，任务可以按以下方式通知这些主题:

handlers can also "listen" to generic topics, and tasks can notify those topics as follows:

handlers:
    - name: restart memcached
      service: name=memcached state=restarted
      listen: "restart web services"
    - name: restart apache
      service: name=apache state=restarted
      listen: "restart web services"

tasks:
    - name: restart everything
      command: echo "this task will restart the web services"
      notify: "restart web services"

此用法使触发多个处理程序变得更加容易.它还使处理程序与其名称脱钩，从而使在剧本和角色之间共享处理程序更加容易

This use makes it much easier to trigger multiple handlers. It also decouples handlers from their names, making it easier to share handlers among playbooks and roles

专门针对这个问题，这应该可行:

Specifically to the question, this should work:

- name: Check if restarted
  shell: check_is_started.sh
  register: result
  listen: Restart processes

- name: Restart conditionally step 2
  service: name=service state=restarted
  when: result
  listen: Restart processes

在任务中，通过重新启动进程"通知处理程序

and in the task, notify handlers via 'Restart processes'

http://docs.ansible.com/ansible/playbooks_intro.html#handlers-running-operations-on-change

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