我如何循环遍历 Ansible 中由通配符标识的主机

Question

下面是我的剧本，效果很好。

---
- hosts: "PROD_SERVERS"
  user: "{{USER}}"
  tasks:

       - name: Check if all hosts are reachable
         fail:
           msg: "Server is UNREACHABLE."
         when: "hostvars[item].ansible_facts|list|length == 0"
         with_items: "{{ groups.PROD_SERVERS }}"

但是，当主机显示为通配符时，您能帮我解决语法问题吗？{{ENV}}_*？

---
- hosts: "{{ENV}}_*"
  user: "{{USER}}"
  tasks:

       - name: Check if all hosts are reachable
         fail:
           msg: "Server is UNREACHABLE."
         when: "hostvars[item].ansible_facts|list|length == 0"
         with_items: "{{ groups.{{ENV}}_* }}"   <------- Need help with this part of the code

Answer 1

有special variables也被称为“魔法变量”来识别当前播放的主机。他们是：

ansible_play_hosts
ansible_play_batch

您可以使用这些变量之一代替库存组名称进行循环。

示例ansible_play_hosts：

    - fail:
        msg: "Server is UNREACHABLE."
      when: hostvars[item].ansible_facts|list|length == 0
      with_items: "{{ ansible_play_hosts }}"

更新：

更改了 Ansible 版本“2.4.x”的示例，应使用 with_items 而不是 loop 执行循环。引用自 official documentation

We added loop in Ansible 2.5. It is not yet a full replacement for with_<lookup>, but we recommend it for most use cases.

注意：对于 Ansible“2.9.16”和“2.10.2”loop 也适用。

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