關鍵字：CentOS SSH,SSH無密碼登陸,SSH
一、環境配置
1、服務端：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無密碼登錄需要3步：
1、生成公鑰和私鑰
2、導入公鑰到認證文件,更改權限
3、測試
三、客戶端配置
1、在客戶端生成私鑰與公鑰；
# ssh-keygen
[root@jw02 ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): #回車（代表無需密碼登陸）
Enter passphrase (empty for no passphrase): #回車
Enter same passphrase again: #回車
Your identification has been saved in /root/.ssh/id_rsa. #代表私鑰
Your public key has been saved in /root/.ssh/id_rsa.pub. #代表公鑰
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、默認在 ~/.ssh或者/root/.ssh/目錄生成兩個文件：
公鑰為：id_rsa.pub
私鑰為：id_rsa
