ANSIBLE13(failed_when和changed_when)

botang

本来会执行成功：

1. ---
   
2. - name: failed_when
   
3.   hosts: server3.example.com
   
4.   tasks:
   
5.   - name: run user creation script
   
6.     shell: "echo SPOTO"
   
7.     register: v_create
   
8.   #  failed_when: '"already exists" not in v_create.stderr'
   
9.   #  ignore_errors: yes
   
10. 
    
11.   - name: debug info
    
12.     debug:
    
13.       var: v_create
    
14.                   

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但是要有条件地让它执行失败：

1. ---
   
2. - name: failed_when
   
3.   hosts: server3.example.com
   
4.   tasks:
   
5.   - name: run user creation script
   
6.     shell: "echo SPOTO"
   
7.     register: v_create
   
8.     failed_when: '"SPOTO" in v_create.stdout'
   
9.     ignore_errors: yes
   
10. 
    
11.   - name: debug info
    
12.     debug:
    
13.       var: v_create
    

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1. [student@classroom ansible]$ ansible-playbook  v6-5_server3.yml

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PLAY [failed_when] *************************************************************************************************************************************************************

TASK [Gathering Facts] *********************************************************************************************************************************************************
ok: [server3.example.com]

TASK [run user creation script] ************************************************************************************************************************************************
fatal: [server3.example.com]: FAILED! => {"changed": true, "cmd": "echo SPOTO", "delta": "0:00:00.003968", "end": "2020-08-15 15:33:56.816235", "failed_when_result": true, "rc": 0, "start": "2020-08-15 15:33:56.812267", "stderr": "", "stderr_lines": [], "stdout": "SPOTO", "stdout_lines": ["SPOTO"]}
...ignoring

TASK [debug info] **************************************************************************************************************************************************************
ok: [server3.example.com] => {
    "v_create": {
        "changed": true,
        "cmd": "echo SPOTO",
        "delta": "0:00:00.003968",
        "end": "2020-08-15 15:33:56.816235",
        "failed": true,
        "failed_when_result": true,
        "rc": 0,
        "start": "2020-08-15 15:33:56.812267",
        "stderr": "",
        "stderr_lines": [],
        "stdout": "SPOTO",
        "stdout_lines": [
            "SPOTO"
        ]
    }
}

PLAY RECAP *********************************************************************************************************************************************************************
server3.example.com        : ok=3    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=1

1. ---
   
2. - name: failed_when
   
3.   hosts: server3.example.com
   
4.   tasks:
   
5.   - name: run user creation script
   
6.     shell: "echo SPOTO"
   
7.     register: v_fail
   
8. 
   
9.   - name: debug info
   
10.     fail:
    
11.       msg: "XXXXXXXXXXXXX"
    
12.     when: '"SPOTO" in v_fail.stdout'
    

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下面是changed_when（非要把绿的说黄的，黄的才会触发handlers）:

1. ---
   
2. - name: changed_when
   
3.   hosts: webgroup
   
4.   tasks:
   
5.   - name: test service state
   
6.     service:
   
7.       name: sshd
   
8.       state: started
   
9.       enabled: yes
   
10.     register: v_result
    
11.     changed_when: "'running' in v_result.status.SubState "
    
12.     notify:
    
13.       - h_srv_restart
    
14. 
    
15. #  - name: debug
    
16. #    debug:
    
17. #      var: v_result
    
18. 
    
19.   handlers:
    
20.   - name: h_srv_restart
    
21.     service:
    
22.       name: httpd
    
23.       state: restarted
    

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反过来，非要把黄的说成绿的：

1. - name: another tasks
   
2.   hosts: srvgroup
   
3.   tasks:
   
4.   - name: check date
   
5.     shell: "date"
   
6.     register: v_date
   
7.     changed_when: false
   
8. 
   
9.   - debug:
   
10.       var: v_date
    

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