Ansible 命令模块说“|"是非法字符 [英] Ansible Command module says that '|' is illegal character

问题描述

我正在使用 Ansible 来部署我的项目，我尝试检查是否安装了指定的包，但我遇到了问题，任务如下:

I am using Ansible to deploy my project and I trying to check if an specified package is installed, but I have a problem with it task, here is the task:

- name: Check if python-apt is installed
  command: dpkg -l | grep python-apt
  register: python_apt_installed
  ignore_errors: True

问题来了:

$ ansible-playbook -i hosts idempotent.yml

PLAY [lxc-host] *************************************************************** 

GATHERING FACTS *************************************************************** 
ok: [10.0.3.240]

TASK: [idempotent | Check if python-apt is installed] ************************* 
failed: [10.0.3.240] => {"changed": true, "cmd": ["dpkg", "-l", "|", "grep", "python-apt"], "delta": "0:00:00.015524", "end": "2014-07-10 14:41:35.207971", "rc": 2, "start": "2014-07-10 14:41:35.192447"}
stderr: dpkg-query: error: package name in specifier '|' is illegal: must start with an alphanumeric character
...ignoring

PLAY RECAP ******************************************************************** 
10.0.3.240                 : ok=2    changed=1    unreachable=0    failed=0 

为什么这个字符是非法的'|'.

Why is illegal this character '|' .

推荐答案

来自文档:

command - 执行命令在远程节点上

command - Executes a command on a remote node

命令模块采用命令名称后跟一个列表以空格分隔的参数.给定的命令将在所有选定的节点.不会通过shell处理，所以像 $HOME 这样的变量和像<"、>"、|"和&"这样的操作将要不起作用(如果您需要这些功能，请使用 shell 模块).

The command module takes the command name followed by a list of space-delimited arguments. The given command will be executed on all selected nodes. It will not be processed through the shell, so variables like $HOME and operations like "<", ">", "|", and "&" will not work (use the shell module if you need these features).

shell - 执行命令在节点

shell - Executes a commands in nodes

shell 模块采用命令名称后跟以空格分隔的参数列表.它几乎与命令模块完全一样，但运行命令通过远程节点上的 shell (/bin/sh).

The shell module takes the command name followed by a list of space-delimited arguments. It is almost exactly like the command module but runs the command through a shell (/bin/sh) on the remote node.

因此你必须使用 shell: dpkg -l |grep python-apt.

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