本节优势：

简化知识，将晦涩复杂的知识简单化输出，并告诉举一反三的方法，使其可以深入浅出的理解

1. 安装ansible
   1）免密登录
   流程：创建被管理端ip、用户、密码文件-执行脚本
   

#!/usr/bin/env bash
#ssh secret free
secret_free() {
   
echo " = = = = = = = = = = = = = = = = 免密交互 = = = = = = = = = = = = = = = = "
#安装expect
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