Ansible 模板和 jinja {%block%}答案

【问题标题】：Ansible templates and jinja {%block%}Ansible 模板和 jinja {%block%}
【发布时间】：2019-11-10 22:13:14
【问题描述】：

我需要在远程主机上使用多个模板文件和 Jinja 的 {% block block_name %} 在我的 Ansible 角色中生成一个文件

例如，

main.conf.j2：

value1 = 123
value2 = 456

{% block test %} {% endblock %}

value3 = 789

{% block example %} {% endblock %}

value4 = abcd

test.conf.j2：

{% block test %}
more text here
{% endblock %}

example.conf.j2

{% block example %}
....
example_param = 'example!'
....
{% endblock %}

下一步是什么？我必须在 test.conf.j2 和 example.conf.j2 中使用{% extends 'nginx.conf.j2' %}？如果是这样 - 我的 Ansible 任务会怎样？还是别的什么？

如果我尝试这样的事情：

- name: Copy config
  template:
    src: "{{ item }}"
    dest: "{{ conf_file_path }}"
  with_items:
    - "main.conf.j2"
    - "test.conf.j2"
    - "example.conf.j2"
    - "abcd.conf.j2"

它仅适用于 main.conf.j2 和 test.conf.j2，但忽略 example.conf.j2 和其他模板

【问题讨论】：

标签： ansible ansible-2.x ansible-template

【解决方案1】：

问：“下一步是什么？我必须使用 {% extends 'nginx.conf.j2' %} ...？”

答：是的。需要extends。例如

    - template:
        src: test.j2
        dest: test

使用模板

    shell> cat main.j2
    value1 = 123
    {% block test %}
    value = default value in main.j2
    {% endblock %}
    value3 = 789

    shell> cat test.j2 
    {% extends 'main.j2' %}
    {% block test %}
    value = custom value in test.j2
    {% endblock %}

给予

    shell> cat test 
    value1 = 123
    value = custom value in test.j2
    value3 = 789

问：“我的 Ansible 任务看起来如何？”

    - name: Copy config
      template:
        src: "{{ item }}"
        dest: "{{ conf_file_path }}"
      with_items:
        - "main.conf.j2"
        - "test.conf.j2"
        - "example.conf.j2"
        - "abcd.conf.j2"

A：循环会在每次迭代中重复覆盖dest文件。见template。

FWIW。可以使用blockinfile 并循环模板的lookup。例如

    - template:
        src: main2.j2
        dest: test
    - blockinfile:
        marker: "# {mark} ANSIBLE MANAGED BLOCK {{ item }}"
        path: test
        block: "{{ lookup('template', item) }}"
      loop:
        - test.conf.j2
        - example.conf.j2

使用模板

    shell> cat main2.j2
    value1 = 123
    
    # BEGIN ANSIBLE MANAGED BLOCK test.conf.j2
    value_test = default value in main2.j2
    # END ANSIBLE MANAGED BLOCK test.conf.j2
    
    # BEGIN ANSIBLE MANAGED BLOCK example.conf.j2
    value_example = default value in main2.j2
    # END ANSIBLE MANAGED BLOCK example.conf.j2
    
    value3 = 789

    shell> cat test.conf.j2
    value_test = custom value in test.conf.j2

    shell> cat example.conf.j2
    value_example = custom value in example.conf.j2

给

    shell> cat test 
    value1 = 123
    
    # BEGIN ANSIBLE MANAGED BLOCK test.conf.j2
    value_test = custom value in test.conf.j2
    # END ANSIBLE MANAGED BLOCK test.conf.j2
    
    # BEGIN ANSIBLE MANAGED BLOCK example.conf.j2
    value_example = custom value in example.conf.j2
    # END ANSIBLE MANAGED BLOCK example.conf.j2
    
    value3 = 789

【讨论】：