使用 with_items 和 register 进行迭代 [英] iteration using with_items and register

问题描述

寻求帮助解决我几个小时以来一直在努力解决的问题.我想迭代一个列表，运行一个命令，为每个命令注册输出，然后在每个唯一的寄存器 {{ someregister }}.stdout

Looking for help with a problem I've been struggling with for a few hours. I want to iterate over a list, run a command, register the output for each command and then iterate with debug over each unique registers {{ someregister }}.stdout

例如下面的代码会吐出"msg":"1"和"msg":"2"

For example, the following code will spit out "msg": "1" and "msg": "2"

---

- hosts: localhost
  gather_facts: false

  vars:
    numbers:
      - name: "first"
        int: "1"
      - name: "second"
        int: "2"

  tasks:

    - name: Register output
      command: "/bin/echo {{ item.int }}"
      register: result
      with_items: "{{ numbers }}"

    - debug: msg={{ item.stdout }}
      with_items: "{{ result.results }}"

但是，如果我尝试在使用 with_list 命名的寄存器变量中捕获命令的输出，我将无法访问列表或其中的元素.例如，将代码稍微更改为:

If however, I try and capture the output of a command in a register variable that is named using with_list, I am having trouble accessing the list or the elements within it. For example, altering the code slightly to:

---

- hosts: localhost
  gather_facts: false

  vars:
    numbers:
      - name: "first"
        int: "1"
      - name: "second"
        int: "2"

  tasks:

    - name: Register output
      command: "/bin/echo {{ item.int }}"
      register: "{{ item.name }}"
      with_items: "{{ numbers }}"

    - debug: var={{ item.name.stdout }}
      with_items: "{{ numbers }}"

给我:

TASK [debug] 

> ******************************************************************* fatal: [localhost]: FAILED! => {"failed": true, "msg": "'unicode
> object' has no attribute 'stdout'"}

是否不能将寄存器动态命名为命令的输出，然后可以在剧中稍后调用?我希望命令的每次迭代及其后续的 register 名称都可以唯一访问，例如，鉴于最后一个示例，我希望有注册的变量称为first"和第二"但没有.

Is it not possible to dynamically name the register the output of a command which can then be called later on in the play? I would like each iteration of the command and its subsequent register name to be accessed uniquely, e.g, given the last example I would expect there to be variables registered called "first" and "second" but there aren't.

从调试节中删除 with_items，并使用 first.stdout 显式定义 var 或消息返回未定义".

Taking away the with_items from the debug stanza, and just explicitly defining the var or message using first.stdout returns "undefined".

Centos 7_2 上的 Ansible 版本为 2.0.2.0.

Ansible version is 2.0.2.0 on Centos 7_2.

提前致谢.

推荐答案

OK 所以我找到了一个 stackoverflow 上的帖子 帮助我更好地了解这里发生了什么以及如何访问 result.results 中的元素.

OK so I found a post on stackoverflow that helped me better understand what is going on here and how to access the elements in result.results.

我最终得到的代码是:

---

- hosts: localhost
  gather_facts: false

  vars:
    numbers:
      - name: "first"
        int: "1"
      - name: "second"
        int: "2"

  tasks:

    - name: Register output
      command: "/bin/echo {{ item.int }}"
      register: echo_out
      with_items: "{{ numbers }}"

    - debug: msg="item.item={{item.item.name}}, item.stdout={{item.stdout}}"
      with_items: "{{ echo_out.results }}"

这给了我想要的结果:

"msg": "item.item=first, item.stdout=1"
"msg": "item.item=second, item.stdout=2"

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