CentOS SSH 无密码登陆

关键字：CentOS SSH,SSH无密码登陆,SSH

一、环境配置
 
1、服务端：CentOS release 5.3  IP：222.73.115.198
 
2、客服端：CentOS release 5.8  IP：192.168.4.244
 
二、配置SSH无密码登录需要3步：
 1、生成公钥和私钥
 2、导入公钥到认证文件,更改权限
 3、测试
 
三、客户端配置
 
1、在客户端生成私钥与公钥；
 
#  ssh-keygen

[root@jw02 ~]# ssh-keygen
Generating public/private rsa key pair.
 Enter file in which to save the key (/root/.ssh/id_rsa):  #回车（代表无需密码登陆）
Enter passphrase (empty for no passphrase):              #回车
Enter same passphrase again:                            #回车
Your identification has been saved in /root/.ssh/id_rsa.    #代表私钥
Your public key has been saved in /root/.ssh/id_rsa.pub.  #代表公钥
The key fingerprint is:
 04:45:0b:47:10:92:0c:b2:b9:d7:11:5b:49:05:e4:d9 root@jw02
[root@jw02 ~]# ls ~/.ssh/
id_rsa  id_rsa.pub  known_hosts

2、默认在 ~/.ssh或者/root/.ssh/目录生成两个文件：
    公钥为：id_rsa.pub
    私钥为：id_rsa