linux 配置SSH无密码登录

1. 检查SSH是否安装。

   yum install ssh

  yum install rsync

rpm -qa|grep openssh

rpm -qa|grep rsync

2. 生成ssh公钥（以hadoop用户执行）

ssh-keygen -t rsa 

ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop01@master

ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop01@slave1

ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop01@slave2

每台机器上都执行

3. 验证安装

ssh master

ssh slave1