Ansible：如何用with_items将同一变量传递给source和dest的index

我尝试在Ansible的uri模块请求体里，把同一个值传递给source和dest的index字段，编写的Playbook代码如下：

- name: Add to servers
  ignore_errors: yes
  uri:
    url: "{{proto}}://{{newserver}}:{{port}}/_reindex"
    method: POST
    headers:
      Authorization: 'Basic ABCDEFGHI=='
    body:
      source :
        remote:
          host: "{{proto}}://{{oldserver}}:{{port}}"
          username: abc
          password: def
        index: "{{item}}" 
        type: "_doc"
      dest:
        index: "{{item}}"
        type: "_doc"
      with_items: "{{jsoncontent.content[6:].splitlines()}}"
    delay: 5
    body_format: json

运行时抛出如下错误：

{"msg": "The task includes an option with an undefined variable. The error was: 'item' is undefined

The error appears to be in '/somefile/abc.yml: line 72, column 3, but may
be elsewhere in the file depending on the exact syntax problem }

...ignoring

我推测是with_items的缩进位置不正确，尝试调整缩进但仍失败，请问如何实现将with_items的同一值传递给source和dest的index？

解决方案 #

问题核心是with_items的缩进层级错误：你把它嵌套在了body字段内部，属于uri模块的参数范畴，但with_items是Ansible的任务级循环控制，必须和name、uri这些任务属性同级，不能放在模块参数里。

修正后的Playbook代码如下：

- name: Add to servers
  ignore_errors: yes
  with_items: "{{jsoncontent.content[6:].splitlines()}}"
  uri:
    url: "{{proto}}://{{newserver}}:{{port}}/_reindex"
    method: POST
    headers:
      Authorization: 'Basic ABCDEFGHI=='
    body:
      source :
        remote:
          host: "{{proto}}://{{oldserver}}:{{port}}"
          username: abc
          password: def
        index: "{{item}}" 
        type: "_doc"
      dest:
        index: "{{item}}"
        type: "_doc"
    delay: 5
    body_format: json

调整后，with_items处于任务级别，每次循环时item变量会被正确赋值，source和dest的index就能获取到同一个循环值，解决变量未定义的问题。

内容的提问来源于stack exchange，提问作者nonoob