在ansible中访问嵌套变量 [英] accessing nested variable variables in ansible

问题描述

这是我的 group_vars/all 文件:

Here is my group_vars/all file:

app_env: staging

staging:
  app_a:
    db_host: localhost
  app_b:
    db_host: localhost
production:
  app_a:
    db_host: app_a-db.example.net
  app_b:
    db_host: app_b-db.example.com

如果 app_env 环境必须是生产环境，我会通过库存变量覆盖它.这样，除非您明确将它们设置为生产环境，否则所有部署都将处于暂存阶段.

If app_env environment has to be production, I overwrite this via inventory variables. This way, all deployments are staging unless you make them production explicitly.

所以，当我想在剧本中打印变量时，我可以这样做

So, when I want to print the variable in a playbook, I can do

---
  - debug: var={{app_env}}.app_a.db_host

这有效！

但是如何访问另一个模块中的变量，即 lineinfile?

But how can I access the Variable in another module, i.e. lineinfile?

一些没有成功的例子:

- lineinfile: dest=/etc/profile line='export APP_A_DB_HOST="{{ app_env.app_a.db_host }}"'
- lineinfile: dest=/etc/profile line='export APP_A_DB_HOST="{{ app_env[app_a][db_host] }}"'
- lineinfile: dest=/etc/profile line='export APP_A_DB_HOST="{{ {{app_env}}.app_a.db_host }}"'

可行的解决方案是使用 set_fact 模块(双行代码，不是很聪明)或包含不同的变量文件，具体取决于 app_env.

Working solutions would be using the set_fact module (double lines of code, not really smart) or including different variable files, depending on app_env.

但我真的很想知道是否有访问嵌套变量变量的符号;)

But I really would like to know if theres a notation to access nested variable variables ;)

推荐答案

如果你的环境字典"不在根目录，你会让你的生活更轻松，就像这样:

You would make your life easier with your 'environment dict' not being at the root, like so:

app_env: staging

app_environments:
  staging:
    app_a:
      db_host: localhost
    app_b:
      db_host: localhost
  production:
    app_a:
      db_host: app_a-db.example.net
    app_b:
      db_host: app_b-db.example.com

然后，您应该可以使用 {{app_environments[app_env].app_a.db_host}} 或 {{app_environments[app_env]['app_a']['db_host']}} 无处不在(Jinja 模板、任务).

Then, you should be able to use {{app_environments[app_env].app_a.db_host}} or {{app_environments[app_env]['app_a']['db_host']}} everywhere (Jinja templates, tasks).

不过要注意太多的嵌套"！

Watch out for too much "nestiness" though !

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