Ansible 检查字典是否存在 [英] Ansible check if dictionary exists

问题描述

我想部署额外的 mysql 用户 - 如果设置.所以我正在使用字典.例如:

i want to deploy additional mysql users - if set. So i am using a dictionary. E.g.:

mysql_additional_users:
  user1:
    password: mysecretpass
    privs: "database1.*:ALL"

只要定义了字典，它就可以正常工作.如果没有 - 它会失败.

which works fine, as long as the dict is defined. If not - it fails.

虽然我试图确定，如果 dict 已定义:

Although i tried to determine, if the dict is defined:

  - name: create additional mysql users
    mysql_user: name={{ item.key }} password={{ item.value.password }} priv={{ item.value.privs }} state=present      
    with_dict: "{{ mysql_additional_users }}"
    when: mysql_additional_users is defined 

但我总是得到一个错误:

But i always get an error:

fatal: [<hostname>]: FAILED! => {"failed": true, "msg": "ERROR! 'mysql_additional_users' is undefined"}

有什么想法吗?

推荐答案

with_dict 总是被评估.如果你想在 when 中使用它，试试这个:

with_dict is evaluated always. If you want to use it with when, try this:

with_dict: mysql_additional_users | default({})
when: mysql_additional_users is defined

它将评估为空字典，但任务将被 when 跳过.

it will evaluate to empty dict but the task will be skipped by when.

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