该Ansible变量应如何定义?

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问题描述

我试图弄清我在一个不完整的Ansible角色中发现的变量引用.角色使用

I am trying to make sense of a variable reference I found in an incomplete Ansible role. The role references a value using

dest: "{{params['box'].t1}}"

我在另一个yaml文件中

In a separate yaml file I have

box:
    t1: "Albany"
    t2: "Albuquerque"

params没有定义，所以显然这是行不通的，但是我无法弄清楚定义它的正确方法. 有人可以告诉我，在Ansible中必须为该变量引用定义参数的地方(或方式)吗?

params isn't defined, so obviously this isn't going to work, but I can't figure out the correct way to define it. Can someone tell me where (or how) params must be defined for this variable reference to work in Ansible?

相关问题. dest: {{params['box'].t1}}中使用方括号是否表示它是字典?如果可以，我也可以写为dest: {{params['box']['t1']}或dest: {{params.box.t1}吗?

Related questions. Does the use of square brackets in dest: "{{params['box'].t1}}" indicate that it is a dictionary? If yes, could I also write this as dest: "{{params['box']['t1']}" or dest: "{{params.box.t1}"?

推荐答案

params['box'].t1在以下位置引用Albany:

params:
  box:
    t1: "Albany"
    t2: "Albuquerque"

与params.box.t1和params['box']['t1']相同.

括号指的是键名，因此暗示它是字典.

Brackets refer to a key name, so they imply it is a dictionary.

当您想通过变量引用键时，通常使用方括号符号:

You typically use square bracket-notation when you want to refer to a key via a variable:

vars:
  wanted_key: box
  params:
    box:
      t1: Albany
    other:
      t1: Albuquerque

然后params[wanted_key].t1指的是Albany.

在您的示例中，方括号内的值是一个字符串(用引号引起来)，因此上述所有示例都是等效的.

In your example the value inside square brackets is a string (quoted), so all above examples are equivalent.

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Params