Ansible:如何执行一个循环来调用一系列处理程序任务？

Question

我对ansible非常陌生，我一直致力于编写ansible角色来自动化Jenkins的增量升级过程。此过程的一部分涉及创建一个循环，该循环在实例上安装的Jenkins当前版本比目标版本更早的情况下执行。

# Install the incremental upgraded version of Jenkins
- name: upgrade and restart jenkins on each iterative upgrade
  yum:
    name: "jenkins-{{ item.jenkins_target_version }}"
    state: present
  when: (jenkins_current_version | float) < "{{ item.jenkins_target_version_filtered }}"
  loop: "{{ packages }}"
  notify: restart jenkins
  when: (jenkins_current_version | float) < jenkins_target_filtered

循环应该循环通过包列表，如下所示

packages:
  - { jenkins_target_version: 2.176-1.1, jenkins_target_version_filtered: 2.176 }
  - { jenkins_target_version: 2.190-1.1, jenkins_target_version_filtered: 2.190 }
  - { jenkins_target_version: 2.204-1.1, jenkins_target_version_filtered: 2.204 }
  - { jenkins_target_version: 2.222-1.1, jenkins_target_version_filtered: 2.222 }
  - { jenkins_target_version: 2.235-1.1, jenkins_target_version_filtered: 2.235 }
  - { jenkins_target_version: 2.249-1.1, jenkins_target_version_filtered: 2.249 }
  - { jenkins_target_version: 2.263-1.1, jenkins_target_version_filtered: 2.263 }
  - { jenkins_target_version: 2.277-1.1, jenkins_target_version_filtered: 2.277 }
  - { jenkins_target_version: 2.289-1.1, jenkins_target_version_filtered: 2.289 }
  - { jenkins_target_version: 2.303-1.1, jenkins_target_version_filtered: 2.303 }
  - { jenkins_target_version: 2.319-1.1, jenkins_target_version_filtered: 2.319 }
  - { jenkins_target_version: 2.332-1.1, jenkins_target_version_filtered: 2.332 }
  - { jenkins_target_version: 2.343-1.1, jenkins_target_version_filtered: 2.343 }
  - { jenkins_target_version: 2.346-1.1, jenkins_target_version_filtered: 2.346 }

并且，只有在目标系统上安装版本时，它才是比当前安装的版本新的迭代。循环似乎工作正常，并在目标实例上安装jenkins的升级，问题是，每当jenkins升级时，我都想执行一系列处理程序任务。

处理程序是存储在处理程序文件夹中的一系列任务，这些任务重新启动服务并检查事物是否备份和运行是否正常(除其他事项外)。问题是，每次迭代升级完成后，都不会调用和执行处理程序任务。我正在寻求建议，我如何才能做到这一点，谢谢提前。

Answer 1

问：“我想执行一系列处理程序任务。”。

答:使用关键字选择更多的任务。例如，给定处理程序

shell> cat handlers/restart_jenkins.yml
- debug:
    msg: Restart service
  listen: restart jenkins

- debug:
    msg: Check that things are back up and running ok
  listen: restart jenkins

- debug:
    msg: |-
      Do whatever you want next
      {{ out.results|json_query('[].stdout') }}
  listen: restart jenkins

剧本

- hosts: test_11
  gather_facts: false
  vars:
    packages:
      - {target: 2.176-1.1, current: 2.176}
      - {target: 2.190-1.1, current: 2.190}
      - {target: 2.204-1.1, current: 2.205}
  tasks:
    - command: "echo install {{ item.target }}"
      register: out
      notify: restart jenkins
      loop: "{{ packages }}"
      when: item.current is version(item.target, "<")
    - meta: flush_handlers
    - debug:
        msg: Continue ...
  handlers:
    - import_tasks: handlers/restart_jenkins.yml

给出

PLAY [test_11] *******************************************************************************

TASK [command] *******************************************************************************
changed: [test_11] => (item={'target': '2.176-1.1', 'current': 2.176})
changed: [test_11] => (item={'target': '2.190-1.1', 'current': 2.19})
skipping: [test_11] => (item={'target': '2.204-1.1', 'current': 2.205}) 

TASK [meta] **********************************************************************************

RUNNING HANDLER [debug] **********************************************************************
ok: [test_11] => 
  msg: Restart service

RUNNING HANDLER [debug] **********************************************************************
ok: [test_11] => 
  msg: Check that things are back up and running ok

RUNNING HANDLER [debug] **********************************************************************
ok: [test_11] => 
  msg: |-
    Do whatever you want next
    ['install 2.176-1.1', 'install 2.190-1.1']

TASK [debug] *********************************************************************************
ok: [test_11] => 
  msg: Continue ...

PLAY RECAP ***********************************************************************************
test_11                    : ok=5    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

备注：

• 在循环中安装新版本的用例没有意义。这里的剧本唯一的目的是演示handlers.
• Flush的功能--处理程序--如果您不想等到剧本结束时再看.