Ansible中的group_names变量

Question

当我执行这个playbook时，遇到了一些问题：

- hosts: all
  connection: local
  tasks:
  - template: src=/etc/ansible/{{group_names}}/common.j2 dest=/etc/ansible/configs/{{inventory_hostname}}.txt
    name: create common config snippets

我得到的错误是：

fatal: [R1]: FAILED! => {"changed": false, "failed": true, "msg": "Unable to find '/etc/ansible/[u'ios']/common.j2' in expected paths."}
fatal: [R2]: FAILED! => {"changed": false, "failed": true, "msg": "Unable to find '/etc/ansible/[u'ios1']/common.j2' in expected paths."}

这是我的群组：

/etc/ansible# cat hosts | grep ios           
[ios]
[ios1]

这里是我的common.j2文件：

/etc/ansible# ls ios1/
common.j2


/etc/ansible# ls ios/ 
common.j2

请问有人能详细解释一下为什么 group_names 返回的是 [u'group_names'] 吗？

- NANIS

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group_names是一个列表，详见魔术变量和如何访问其他主机的信息。在文件名中这样替换是没有意义的。 - larsks

我对ansible很新，不知道这个，非常感谢您的及时回答。 - NANIS

Answer 1

因为group_names是一个列表（所以被[ ]包围）—— 一个主机可以属于多个组。

您需要决定，您的目标是什么：

• If you wanted to include files for all groups, you have to add a loop:

  - hosts: all
    connection: local
    tasks:
      - name: create common config snippets
        template:
          src: /etc/ansible/{{item}}/common.j2
          dest: /etc/ansible/configs/{{inventory_hostname}}.txt
        with_items: "{{group_names}}"
  

• If you wanted to add a single group, you could refer to a single element (group_names[0]), but that doesn't seem practical...

- techraf

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你们太棒了。 - NANIS