jinja2 - AnsibleUndefinedVariable:“dict 对象"没有属性“{{ target_hosts }}"“" [英] jinja2 - AnsibleUndefinedVariable: 'dict object' has no attribute '"{{ target_hosts }}"'"

问题描述

这是我更新/etc/hosts 文件的 Ansible 剧本:

This is my Ansible playbook to update /etc/hosts file:

- name: Update /etc/hosts file
  hosts: "{{ target_hosts }}"
  remote_user: awx
  become: yes
  become_method: sudo
  tasks:

    - debug:
        msg: 'show me the variable: {{ target_hosts }}'

    - name: Update /etc/hosts file
      template: src=../../templates/hosts.j2 dest=/etc/hosts

这是jinja模板:

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

{% for item in groups['"{{ target_hosts }}"'] %}
{{ hostvars[item]['ansible_ssh_host'] }} {{ hostvars[item]['openstack']['name'] }}
{% endfor %}

如果我在模板中放置一个静态值(例如对于组中的项目['my-server-group'])，一切正常，但我想使用一个变量，通过动态到剧本.

Everything works fine if I put a static value in the template (for example for item in groups['my-server-group']), but I would like to use a variable, passed dinamically to the playbook.

我得到的错误是:

AnsibleUndefinedVariable: 'dict object' has no attribute '\"{{ target_hosts }}\"'"

通过调试消息，我确定剧本获得了参数:

With the debug msg I'm sure that the playbook gets the parameter:

> "msg": "show me the variable: my-server-group". 

也许 j2 模板没有?
语法错了吗?我用引号、双引号和两者的组合都试过了.

Maybe the j2 template doesn't?
Is the syntax wrong? I tried both with quotes, double quotes and combination of two.

推荐答案

语法错误吗?

是的.不要嵌套 Jinja2 表达式.在您的情况下 {{ 在 {% 内.

Yes. Don't nest Jinja2 expressions. In your case {{ inside of {%.

正确的语法:

{% for item in groups[target_hosts] %}

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