ANSIBLE14(block-rescue-always)

botang

1. ---
   
2. - name: ansible (block & resuce & always)
   
3.   hosts:  srvgroup
   
4.   gather_facts: no
   
5.   tasks:
   
6.   - name: block & rescue
   
7.     block:
   
8.     - name: test file is exists
   
9.       shell: "ls /tmp/XXX"
   
10. 
    
11.     rescue:
    
12.     - name: create file
    
13.       copy:
    
14.         content: "welcome to XXX\n"
    
15.         dest: "/tmp/XXX"
    
16. 
    
17.     always:
    
18.     - name: welcome
    
19.       shell: "cat /tmp/XXX"
    
20.       register: v_result
    
21. 
    
22.     - name: Display
    
23.       debug:
    
24.         msg: "{{ v_result.stdout }}"
    

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对照每一步的输出：

1. ---
   
2. - name: ansible (block & resuce & always)
   
3.   hosts:  srvgroup
   
4.   gather_facts: no
   

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[student@classroom ansible]$ ansible-playbook  v6-8_srvgroup.yml

PLAY [ansible (block & resuce & always)] *********************************************************************************************************************************

1.   tasks:
   
2.   - name: block & rescue
   
3.     block:
   
4.     - name: test file is exists
   
5.       shell: "ls /tmp/XXX"
   

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TASK [test file is exists] ***********************************************************************************************************************************************
fatal: [server3.example.com]: FAILED! => {"ansible_facts": {"discovered_interpreter_python": "/usr/libexec/platform-python"}, "changed": true, "cmd": "ls /tmp/XXX", "delta": "0:00:00.009540", "end": "2020-08-15 16:22:07.181198", "msg": "non-zero return code", "rc": 2, "start": "2020-08-15 16:22:07.171658", "stderr": "ls: cannot access '/tmp/XXX': No such file or directory", "stderr_lines": ["ls: cannot access '/tmp/XXX': No such file or directory"], "stdout": "", "stdout_lines": []}
fatal: [server1.example.com]: FAILED! => {"ansible_facts": {"discovered_interpreter_python": "/usr/libexec/platform-python"}, "changed": true, "cmd": "ls /tmp/XXX", "delta": "0:00:00.025590", "end": "2020-08-15 16:22:07.338628", "msg": "non-zero return code", "rc": 2, "start": "2020-08-15 16:22:07.313038", "stderr": "ls: cannot access '/tmp/XXX': No such file or directory", "stderr_lines": ["ls: cannot access '/tmp/XXX': No such file or directory"], "stdout": "", "stdout_lines": []}
fatal: [server2.example.com]: FAILED! => {"ansible_facts": {"discovered_interpreter_python": "/usr/libexec/platform-python"}, "changed": true, "cmd": "ls /tmp/XXX", "delta": "0:00:00.007247", "end": "2020-08-15 16:22:07.136683", "msg": "non-zero return code", "rc": 2, "start": "2020-08-15 16:22:07.129436", "stderr": "ls: cannot access '/tmp/XXX': No such file or directory", "stderr_lines": ["ls: cannot access '/tmp/XXX': No such file or directory"], "stdout": "", "stdout_lines": []}

1.     rescue:
   
2.     - name: create file
   
3.       copy:
   
4.         content: "welcome to XXX\n"
   
5.         dest: "/tmp/XXX"
   

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TASK [create file] *******************************************************************************************************************************************************
changed: [server3.example.com]
changed: [server1.example.com]
changed: [server2.example.com]

1.     always:
   
2.     - name: welcome
   
3.       shell: "cat /tmp/XXX"
   
4.       register: v_result
   

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TASK [welcome] ***********************************************************************************************************************************************************
changed: [server2.example.com]
changed: [server3.example.com]
changed: [server1.example.com]

1.     - name: Display
   
2.       debug:
   
3.         msg: "{{ v_result.stdout }}"
   

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TASK [Display] ***********************************************************************************************************************************************************
ok: [server1.example.com] => {
    "msg": "welcome to XXX"
}
ok: [server2.example.com] => {
    "msg": "welcome to XXX"
}
ok: [server3.example.com] => {
    "msg": "welcome to XXX"
}

另外一个例子：

1. ---
   
2. - name: 处理任务失败的实验
   
3.   hosts: server3.example.com
   
4.   tasks:
   
5.   - name: install services
   
6.     block:
   
7.     - name: install
   
8.       yum:
   
9.         name: http
   
10.         state: latest
    
11. 
    
12.     rescue:
    
13.     - name: install mysql
    
14.       yum:
    
15.         name: mariadb-server
    
16.         state: latest
    
17. 
    
18.     always:
    
19.     - name: restart mariadb
    
20.       service:
    
21.         name: mariadb
    
22.         state: started
    

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