[Ansible] Phần 10: Xử lý ngoại lệ trong Ansible Playbooks với block và rescue

tasks:
- name: Install, configure, and start Apache
  block: 
  - name: Install httpd and memcached
    yum:
      name:
      - httpd
      - memcached
      state: present

  - name: Apply the foo config template
    template:
      src: templates/src.j2
      dest: /etc/foo.conf

  - name: Start service bar and enable it
    service:
      name: bar
      state: started
      enabled: True
  when: ansible_facts['distribution'] == 'CentOS'
  become: true
  become_user: root
  ignore_errors: true

- hosts: <hosts>
  tasks:
  - block:
    - <task1>
    - <task2>
    - <task3>
    rescue:
    - <rescue_task1>
    - <rescue_task2>
    - <rescue_task3>
    always:
    - <always_task>

- name: Test block/rescue
  hosts: nodes
  gather_facts: false
  tasks:
  - name: Main block
    block:
    - name: Role 1
      include_role:
        name: role1
    
    - name: Role 2
      include_role:
        name: role2

    - name: Accumulate success
      set_fact:
        _result:
          host: "{{ inventory_hostname }}"
          status: "OK"
          interfaces: "{{ ansible_facts['interfaces'] }}"
    
    rescue:
    - name: Accumulate failure
      set_fact:
        _result:
          host: "{{ inventory_hostname }}"
          status: "FAIL"
    
    always:
    - name: Tasks that will always run after the main block
      block: 
      - name: Collect results
        set_fact:
          _global_result: "{{ (_global_result | default([])) + [hostvars[item]['_result']] }}"
          loop: "{{ ansible_play_hosts }}"

      - name: Classify results
        set_fact:
          _result_ok: "{{ _global_result | selectattr('status', 'euqalto', 'OK') | list }}"
          _result_fail: "{{ _global_result | selectattr('status', 'equalto', 'FAIL') | list }}"
    
      - name: Display results OK
        debug:
          msg: "{{ _result_ok }}"
        when: (_result_ok | length ) > 0

      - name: Display results FAIL
        debug:
          msg: "{{ _result_fail }}"
        when: (_result_fail | length ) > 0
      delegate_to: localhost
      run_once: true

PLAY [Test block/rescue] *******************************************************

TASK [Role 1] ******************************************************************

TASK [role1 : Execution of role 1] *********************************************
ok: [node1] => {
    "changed": false,
    "msg": "All assertions passed"
}
fatal: [node2]: FAILED! => {
    "assertion": "inventory_hostname in nodes_ok",
    "changed": false,
    "evaluated_to": false,
    "msg": "Assertion failed"
}
fatal: [node3]: FAILED! => {
    "assertion": "inventory_hostname in nodes_ok",
    "changed": false,
    "evaluated_to": false,
    "msg": "Assertion failed"
}

TASK [Role 2] ******************************************************************

TASK [role2 : Execution of role 2] *********************************************
ok: [node1]

TASK [role2 : Show network information] ****************************************
skipping: [node1]

TASK [Accumulate success] ******************************************************
ok: [node1]

TASK [Accumulate failure] ******************************************************
ok: [node2]
ok: [node3]

TASK [Collect results] *********************************************************
ok: [node1 -> localhost] => (item=node1)
ok: [node1 -> localhost] => (item=node2)
ok: [node1 -> localhost] => (item=node3)

TASK [Classify results] ********************************************************
ok: [node1 -> localhost]

TASK [Display results OK] ******************************************************
ok: [node1 -> localhost] => {
    "msg": [
        {
            "host": "node1",
            "interfaces": [
                "enp7s0",
                "enp1s0",
                "lo"
            ],
            "status": "OK"
        }
    ]
}

TASK [Display results FAIL] ****************************************************
ok: [node1 -> localhost] => {
    "msg": [
        {
            "host": "node2",
            "status": "FAIL"
        },
        {
            "host": "node3",
            "status": "FAIL"
        }
    ]
}

PLAY RECAP *********************************************************************
node1   : ok=7    changed=0    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0   
node2   : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=1    ignored=0   
node3   : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=1    ignored=0