在Ansible(查找)的var中使用var-aws_ssm插件 [英] Use a var in a var in Ansible (lookup) - aws_ssm plugin

问题描述

我正在尝试在Ansible(2.7.10)的var声明中使用var

I'm trying to use a var in a var declaration on Ansible (2.7.10)

我正在使用aws_ssm查找插件( https://docs.ansible.com/ansible/latest/plugins/lookup/aws_ssm.html )

I'm using aws_ssm lookup plugin (https://docs.ansible.com/ansible/latest/plugins/lookup/aws_ssm.html)

工作示例(硬编码值):

Working example (hardcoded values):

var: "{{ lookup('aws_ssm', '/path/server00', region='eu-west-3') }}"

我想对服务器名称和AWS区域使用变量，但是我所有的尝试都出错了.

I want to use variables for the server name and the AWS region, but all my tentatives went on errors.

到目前为止我已经尝试过的:

What I've tried so far:

var: "{{ lookup('aws_ssm', '/path/{{ server }}', region={{ region }}) }}"

var: "{{ lookup('aws_ssm', '/path/{{ server }}', region= + region) }}"

    - name: xxx
      debug: msg="{{ lookup('aws_ssm', '/path/{{ server }}', region='{{ region }}' ) }}"
      register: var

尚未成功，谢谢您的帮助，

Without any success yet, thanks for your help,

推荐答案

您永远不会嵌套{{...}}模板表达式.如果您已经在模板表达式中，则只需按名称引用变量即可.例如:

You never nest {{...}} template expressions. If you're already inside a template expression, you can just refer to variables by name. For example:

var: "{{ lookup('aws_ssm', '/path/' + server, region=region) }}"

(假设已定义变量server和region.)

(This assumes that the variables server and region are defined.)

您还可以利用Python字符串格式语法.以下内容将为您提供相同的结果:

You can also take advantage of Python string formatting syntax. The following will all give you the same result:

• '/path/' + server
• '/path/%s' % (server)
• '/path/{}'.format(server)

• '/path/' + server
• '/path/%s' % (server)
• '/path/{}'.format(server)

而不是+，您可以使用Jinja ~串联运算符，该运算符的作用类似于+，但是将参数强制为字符串.所以这是一个错误:

And instead of + you can use the Jinja ~ concatenation operator, which acts sort of like + but forces arguments to be strings. So while this is an error:

• 'some string' + 1

这将导致文本some string1:

• 'some string' ~ 1

这篇关于在Ansible(查找)的var中使用var-aws_ssm插件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！