如何在Ansible中重写高优先级变量？

Question

我正在尝试用play vars_prompt变量重写inventory group_vars/all变量。考虑下面的代码：

inventory/group_vars/all.yml

variable_1: test1
variable_2: test2

test.yml

- hosts: localhost
  vars_prompt:
    - name: "variable_1"
      prompt: "Enter variable_1"
      private: no

    - name: "variable_2"
      prompt: "Enter variable_2"
      private: no

- hosts: group_1
  roles:
    - { role: role_1, tags: role_1 }

- hosts: group_2
  roles:
    - { role: role_2, tags: role_2 }

- name: role_1 task
  shell: echo "{{ variable_1 }}"
  register: out

- debug:
    msg: "{{ out.stdout }}"

- name: role_2 task
  shell: echo "{{ variable_2 }}"
  register: out

- debug:
    msg: "{{ out.stdout }}"

TASK [role_1 : role_1 task] *******************************************************************************************************************************
Monday 15 January 2018  03:42:12 -0800 (0:00:02.915)       0:00:15.048 *****
changed: [xxx.xxx.com]

TASK [role_1 : debug] *************************************************************************************************************************************
Monday 15 January 2018  03:42:13 -0800 (0:00:00.525)       0:00:15.574 *****
ok: [xxx.xxx.com] => {
    "msg": "test1"
}

PLAY [group_2] ********************************************************************************************************************************************

TASK [Gathering Facts] ************************************************************************************************************************************
Monday 15 January 2018  03:42:13 -0800 (0:00:00.051)       0:00:15.625 *****
ok: [xxx.xxx.com]

TASK [role_2 : role_2 task] *******************************************************************************************************************************
Monday 15 January 2018  03:42:15 -0800 (0:00:02.178)       0:00:17.804 *****
changed: [xxx.xxx.com]

TASK [role_2 : debug] *************************************************************************************************************************************
Monday 15 January 2018  03:42:15 -0800 (0:00:00.397)       0:00:18.202 *****
ok: [xxx.xxx.com] => {
    "msg": "test2"
}

PLAY RECAP ************************************************************************************************************************************************
localhost   : ok=1    changed=0    unreachable=0    failed=0
xxx.xxx.com : ok=3    changed=1    unreachable=0    failed=0
xxx.xxx.com : ok=3    changed=1    unreachable=0    failed=0
xxx.xxx.com : ok=3    changed=1    unreachable=0    failed=0

我想用var1和var2（用vars_prompt接受的值）代替test1和test2（在inventory/group_vars/all.yml中设置的值）重写variable_1和variable_2值。有什么方法可以覆盖这些值吗？或任何其他方法来在不同的剧本中共享变量。

Answer 1

变量提示是与播放绑定的，因此提示的variable_1=var和variable_2=var只注册用于第一次播放（在示例中为空），第二次和第三次播放对此一无所知。

或者将提示应用于相应的播放，或者使用set_fact对所有主机进行run first播放，如下所示：

- hosts: all
  gather_facts: no
  vars_prompt:
    - name: "variable_1"
      prompt: "Enter variable_1"
      private: no
    - name: "variable_2"
      prompt: "Enter variable_2"
      private: no
  tasks:
    - set_fact:
        variable_1: "{{ variable_1 }}"
        variable_2: "{{ variable_2 }}"

- hosts: group_1
  roles:
    - { role: role_1, tags: role_1 }

- hosts: group_2
  roles:
    - { role: role_2, tags: role_2 }

这将定义主机事实variable_1和variable_2，它们是主机绑定的（并通过几次播放存活下来），并且具有比清单中的组变量更高的优先级。