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Ansible实践总结

时间:2019-08-27 20:07:05      阅读:87      评论:0      收藏:0      [点我收藏+]

Ansible playbook 根据条件动态设置变量


  1. 首先新建 inventory,主机列表如下:

    node-01 ansible_host=192.168.64.30
    node-02 ansible_host=192.168.64.31
    
    [app]
    node-01
    
    [db]
    node-02
  2. 然后新建一个 test.yml,新增如下内容:

    - hosts: db[0]:app[0]   # 支持索引取值
      vars:
        - Role: "{{ 'db' if 'app' in group_names else 'app' }}"   # 动态设置变量
        - Ports:
            app: 4503
            db: 4502
    
      pre_tasks:   # 默认tasks只能在roles执行完后才执行,而pre-tasks可以在roles之前执行
        - name: Debug
          debug:
            msg: This is a test message.
    
      roles:
        - testrole
  3. 新建 roles/testrole/defaults/main.yml

    ---
    RESTLink: 'http://{{ inventory_hostname }}:{{ Ports[Role] }}'
  4. 新建 roles/testrole/tasks/main.yml

    ---
    - debug:
        msg: "Final URL is {{ RESTLink }}"
  5. 执行该 playbook

    ansible-playbook -i inventory test.yml

    输出结果是:

    
    PLAY [db[0]:app[0]] *******************************************************************************************************************************************
    
    TASK [Gathering Facts] ****************************************************************************************************************************************
    Tuesday 27 August 2019  18:22:30 +0800 (0:00:00.121)       0:00:00.121 ********
    ok: [node-01]
    ok: [node-02]
    
    TASK [debug] **************************************************************************************************************************************************
    Tuesday 27 August 2019  18:22:32 +0800 (0:00:02.242)       0:00:02.363 ********
    ok: [node-02] => {
        "msg": "This is a test message."
    }
    ok: [node-01] => {
        "msg": "This is a test message."
    }
    
    TASK [testrole : Debug] ***************************************************************************************************************************************
    Tuesday 27 August 2019  18:22:33 +0800 (0:00:00.255)       0:00:02.620 ********
    ok: [node-02] => {
        "msg": "Final URL is http://node-02:4503"
    }
    ok: [node-01] => {
        "msg": "Final URL is http://node-01:4502"
    }
    
    PLAY RECAP ****************************************************************************************************************************************************
    node-01                    : ok=3    changed=0    unreachable=0    failed=0
    node-02                    : ok=3    changed=0    unreachable=0    failed=0

总结:

1. When used in this manner, the order of execution for your playbook is as follows:

  • Any pre_tasks defined in the play.
  • Any handlers triggered so far will be run.
  • Each role listed in roles will execute in turn. Any role dependencies defined in the roles meta/main.yml will be run first, subject to tag filtering and conditionals.
  • Any tasks defined in the play.
  • Any handlers triggered so far will be run.
  • Any post_tasks defined in the play.
  • Any handlers triggered so far will be run.

Ansible实践总结

原文:https://www.cnblogs.com/joneyhsiao/p/11420178.html

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