如何在Ansible中异步运行多个包含任务？ [英] How to run mutiple include tasks asynchronously in ansible?

问题描述

我使用‘INCLUDE’和‘WITH_ITEMS’遍历任务块：

---
- name: main file
  gather_facts: false
  hosts: localhost
  vars:
    list1:
      - { name: 'testuser1', groups: 'wheel', time: 10 }
      - { name: 'testuser2', groups: 'root', time: 3 }
  tasks:     
    - name: multiple tasks
      include: multiple.yml item={{item}}
      with_items: "{{ list1 }}"

，Multiple.yml为：

---
- name: time before
  shell: date +"%H:%M:%S"

- name: run 
  shell: sleep {{ item.time }}

- name: time after
  shell: date +"%H:%M:%S"

该任务运行良好。但是，每个循环的Multiple.yml都是按顺序执行的：

TASK [time before] ******************************************************************************************
changed: [localhost] => {"changed": true, "cmd": "date +"%H:%M:%S"", "delta": "0:00:00.013440", "end": "2018-11-25 15:56:04.595098", "rc": 0, "start": "2018-11-25 15:56:04.581658", "stderr": "", "stderr_lines": [], "stdout": "15:56:04", "stdout_lines": ["15:56:04"]}

TASK [run] ******************************************************************************************
changed: [localhost] => {"changed": true, "cmd": "sleep 10", "delta": "0:00:10.013043", "end": "2018-11-25 15:56:14.859720", "rc": 0, "start": "2018-11-25 15:56:04.846677", "stderr": "", "stderr_lines": [], "stdout": "", "stdout_lines": []}

TASK [time after] *******************************************************************************************
changed: [localhost] => {"changed": true, "cmd": "date +"%H:%M:%S"", "delta": "0:00:00.012656", "end": "2018-11-25 15:56:15.153993", "rc": 0, "start": "2018-11-25 15:56:15.141337", "stderr": "", "stderr_lines": [], "stdout": "15:56:15", "stdout_lines": ["15:56:15"]}

TASK [time before] ******************************************************************************************
changed: [localhost] => {"changed": true, "cmd": "date +"%H:%M:%S"", "delta": "0:00:01.014217", "end": "2018-11-25 15:56:16.448480", "rc": 0, "start": "2018-11-25 15:56:15.434263", "stderr": "", "stderr_lines": [], "stdout": "15:56:15", "stdout_lines": ["15:56:15"]}

TASK [run] ******************************************************************************************
changed: [localhost] => {"changed": true, "cmd": "sleep 3", "delta": "0:00:03.012509", "end": "2018-11-25 15:56:19.711891", "rc": 0, "start": "2018-11-25 15:56:16.699382", "stderr": "", "stderr_lines": [], "stdout": "", "stdout_lines": []}

TASK [time after] *******************************************************************************************
changed: [localhost] => {"changed": true, "cmd": "date +"%H:%M:%S"", "delta": "0:00:01.013766", "end": "2018-11-25 15:56:20.973979", "rc": 0, "start": "2018-11-25 15:56:19.960213", "stderr": "", "stderr_lines": [], "stdout": "15:56:19", "stdout_lines": ["15:56:19"]}

我想异步执行每个循环的Multiple.yml，所以我尝试在主文件中使用异步和轮询：

---
- name: main file
  gather_facts: false
  hosts: localhost
  vars:
    list1:
      - { name: 'testuser1', groups: 'wheel', time: 10 }
      - { name: 'testuser2', groups: 'root', time: 3 }
  tasks:     
    - name: multiple tasks
      include: multiple.yml item={{item}}
      async: 20  
      poll: 0
      with_items: "{{ list1 }}"

预期结果为：

TASK [time before] ******************************************************************************************
    changed: [localhost] => {"changed": true, "cmd": "date +"%H:%M:%S"", "delta": "0:00:00.013440", "end": "2018-11-25 15:56:04.595098", "rc": 0, "start": "2018-11-25 15:56:04.581658", "stderr": "", "stderr_lines": [], "stdout": "15:56:04", "stdout_lines": ["15:56:04"]}

    TASK [run] ******************************************************************************************
    changed: [localhost] => {"changed": true, "cmd": "sleep 10", "delta": "0:00:10.013043", "end": "2018-11-25 15:56:14.859720", "rc": 0, "start": "2018-11-25 15:56:04.846677", "stderr": "", "stderr_lines": [], "stdout": "", "stdout_lines": []}

    TASK [time after] *******************************************************************************************
    changed: [localhost] => {"changed": true, "cmd": "date +"%H:%M:%S"", "delta": "0:00:00.012656", "end": "2018-11-25 15:56:15.153993", "rc": 0, "start": "2018-11-25 15:56:15.141337", "stderr": "", "stderr_lines": [], "stdout": "15:56:15", "stdout_lines": ["15:56:15"]}

    TASK [time before] ******************************************************************************************
    changed: [localhost] => {"changed": true, "cmd": "date +"%H:%M:%S"", "delta": "0:00:01.014217", "end": "2018-11-25 15:56:16.448480", "rc": 0, "start": "2018-11-25 15:56:15.434263", "stderr": "", "stderr_lines": [], "stdout": "15:56:15", "stdout_lines": ["15:56:04"]}

    TASK [run] ******************************************************************************************
    changed: [localhost] => {"changed": true, "cmd": "sleep 3", "delta": "0:00:03.012509", "end": "2018-11-25 15:56:19.711891", "rc": 0, "start": "2018-11-25 15:56:16.699382", "stderr": "", "stderr_lines": [], "stdout": "", "stdout_lines": []}

    TASK [time after] *******************************************************************************************
    changed: [localhost] => {"changed": true, "cmd": "date +"%H:%M:%S"", "delta": "0:00:01.013766", "end": "2018-11-25 15:56:20.973979", "rc": 0, "start": "2018-11-25 15:56:19.960213", "stderr": "", "stderr_lines": [], "stdout": "15:56:19", "stdout_lines": ["15:56:08"]}

但是运行新的main.yml的结果与之前相同，并且两个循环的Multiple.yml不是异步执行的。我不知道问题出在哪里。有什么建议吗？

推荐答案

这是一个known issue，被标记为"改进"，而不是错误。可以在这个问题上发表评论或+1或其他任何内容，但我认为这个问题不会在不久的将来得到解决，因为这个问题自2017年以来一直悬而未决。

---

另外，您可能会感兴趣的是，"内联变量"语法一直受到抨击，支持使用vars:，但即使在这种情况下，您也不需要这样做，因为with_items:会自动公开item，因此它在vars:中是隐式的。不推荐使用"Note" in the manual

这篇关于如何在Ansible中异步运行多个包含任务？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！