如何控制ansible中救援模块的执行

我有一本下面这样的剧本，我想在方块出错时控制救援的执行 在rescue后定义了is_debug时，我添加了

，但当我运行
ansible playbook dashboard.yml时，没有给出is_debug值，当块出错时，仍然执行rescue

我想知道如何控制ansible中救援模块的执行

[root@ansiable-test update]# cat dashboard.yml
---
- hosts: controller
  vars_files:
        - "vars/vars.yml"
  tasks:
    - name: update horizon
    - block:
        - include: "roles/dashboard/tasks/update-horizon.yml"
      rescue:
      when: is_debug is defined
        - debug: msg='An error occurred during the upgrade,roll back to the old version'
        - include: "roles/dashboard/tasks/rollback.yml"

没有
救援
“模块”。它是
块
语法的一部分，当
仅应用于
救援
部分时，不能应用
。您可以将
when
条件应用于
rescue
节中的任务：

- hosts: controller
  vars_files:
        - "vars/vars.yml"
  tasks:
    - name: update horizon
    - block:
        - include: "roles/dashboard/tasks/update-horizon.yml"
      rescue:
        - debug: msg='An error occurred during the upgrade,roll back to the old version'
          when: is_debug is defined

        - include: "roles/dashboard/tasks/rollback.yml"
          when: is_debug is defined