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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