保留特殊字符

ansible

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 2021/11/17   Share

由于Ansible采用Jinja2模板引擎渲染字符串，在需要渲染的时候，如果发现字符串中包含了Jinja2的特殊字符，就会认为这是一个需要渲染的内容。

如下示例：

---
- hosts: localhost
  gather_facts: false
  tasks:
    - name: "测试特殊字符"
      debug:
        var: pvar
      vars:
        pvar: !myvar

运行时会报语法错误

[root@slions_pc1 ansible_poc]# ansible-playbook test.yml
ERROR! We were unable to read either as JSON nor YAML, these are the errors we got from each:
JSON: No JSON object could be decoded

Syntax Error while loading YAML.
  could not determine a constructor for the tag '!myvar'

The error appears to be in '/home/ansible_poc/six.yml': line 9, column 15, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

      vars:
        pvar: !myvar
              ^ here

想要在定义变量时、指定name属性值时或其它会渲染的地方使用这些Jinja2的特殊符号，需要加上!unsafe标记。这个标记会禁止渲染，保留原始的特殊符号。

1 2	vars: pvar: !unsafe "!myvar"

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