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

问题描述

我已经花了几个小时试图给一个.pgpass文件模板化，因为它的结构相当复杂.我认为我需要一个嵌套的"for"循环来访问所需的内容，但是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var:

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文件的格式为:

hostname:port:database:username:password 

因此，对于客户"下的每个客户"，我需要遍历并渲染每个客户的name和pass.我已经尝试了jinja2模板的如此多次迭代，可能不值得一试，因为它们都不起作用:)我愿意以某种方式重组数据，但是我觉得这是一种相当不错的方法对其进行结构化，因为可能需要多台机器将其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?)

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推荐答案

这是一本剧本/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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