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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