jinja2 ansible - 访问复杂的 var [英] jinja2 ansible - accessing complex var

问题描述

我花了几个小时试图为一个 .pgpass 文件模板化一个相当复杂的变量结构.我想我需要一个嵌套的for"循环来访问我需要的东西，但我不确定如何正确地向下钻取.

I've spent hours trying to template a .pgpass file given a fairly complex variable structure. I think I need a nested "for" loop to access what I need, but I'm not sure how to drill down properly.

这是变量:

clients:
  - client1:
      postgres_users:
        - name: user1
          pass: mypassword1
        - name: user3
          pass: mypassword2
      postgres_user_priv_ssh_key: |   
        a
        multiline
        var
      postgres_user_pub_ssh_key: "ssh-rsa blahblahblah"
  - client2:
      postgres_users:
        - name: user3
          pass: mypassword3
        - name: user4
          pass: mypassword4
      postgres_user_priv_ssh_key: |   
        a.n.other
        multiline
        var
      postgres_user_pub_ssh_key: "ssh-rsa blahblahblahdeblah"

.pgpass 文件格式为:

hostname:port:database:username:password 

因此，对于clients"下的每个client"，我需要遍历并呈现每个的 name 和 pass .我已经尝试了很多 jinja2 模板的迭代，可能不值得放在这里，因为它们都不起作用:) 我愿意以某种方式重组数据，但我觉得这是一个相当好的方法来构造它，因为它可能需要被多台机器读取以用于其他目的(一对多?)

So, for each "client" under "clients", I need to iterate through and render the name and pass of each one. I've tried so many iterations of the jinja2 template, that it's probably not worth putting any down here, as none of them worked :) I'm open to restructuring the data in some way, but I feel that that's a fairly good way to structure it, as it may need to be read by multiple machines for other purposes (one to many?)

感谢任何建议！

推荐答案

这里是一个剧本/模板.请注意在变量结构中所做的一些更改.更具体地说，clients 不再是一个列表变量.还为 db_name 和 db_port 添加了 2 个变量:

here is a playbook/template. please note some changes done in the variable structure. More specifically, the clients is not a list variable anymore. added 2 more variables for db_name and db_port as well:

---
- name: test play
  hosts: localhost
  connection: local
  gather_facts: false
  become: yes
  vars:
    db_port: 5432
    db_name: "*"
    clients:
      client1:
        postgres_users:
          - name: user1
            pass: mypassword1
          - name: user3
            pass: mypassword2
        postgres_user_priv_ssh_key: |   
          a
          multiline
          var
        postgres_user_pub_ssh_key: "ssh-rsa blahblahblah"
      client2:
        postgres_users:
          - name: user3
            pass: mypassword3
          - name: user4
            pass: mypassword4
        postgres_user_priv_ssh_key: |   
          a.n.other
          multiline
          var
        postgres_user_pub_ssh_key: "ssh-rsa blahblahblahdeblah"

  tasks:
  - name: run the template
    template:
      src: templates/testt.j2
      dest: /tmp/testt.txt

jinja 模板:

{% for db_client in lookup('dict', clients) %}
{% for user in clients[db_client.key].postgres_users %}
{{ db_client.key }}:{{ db_port }}:{{ db_name }}:{{ user.name }}:{{ user.pass }}
{% endfor %}
{% endfor %}

结果:

[root@optima-ansible ILIAS]# cat /tmp/testt.txt        
client1:5432:*:user1:mypassword1
client1:5432:*:user3:mypassword2
client2:5432:*:user3:mypassword3
client2:5432:*:user4:mypassword4
[root@optima-ansible ILIAS]# 

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