使用SSH公钥(id_dsa.pub)实现免密码登录

首先，在本地机器上产生公钥：
Java代码 
[root@localhost .ssh]# ssh-keygen -d            一直按回车键  
Generating public/private dsa key pair. 
Enter file in which to save the key (/root/.ssh/id_dsa):  
/root/.ssh/id_dsa already exists. 
Overwrite (y/n)? y 
Enter passphrase (empty for no passphrase):  
Enter same passphrase again:  
Your identification has been saved in /root/.ssh/id_dsa. 
Your public key has been saved in /root/.ssh/id_dsa.pub. 
The key fingerprint is: 
89:77:aa:a2:d8:31:35:1e:3a:34:9e:b9:da:ea:62:34 root@localhost.localdomain 
[root@localhost .ssh]# 

然后把产生的公钥传到想要登陆的远程机器上，如果是root用户登陆远程的话，把公钥放在/root/.sshd目录下面。
Java代码 
[root@localhost .ssh]# scp /root/.ssh/id_dsa.pub root@192.168.0.60:/root/.ssh/ 
root@192.168.0.60's password:                 需输入远程机器的登录密码 
id_dsa.pub                                    100%  616     0.6KB/s   00:00     

并修改该文件的名称：
Java代码 
[root@web1 .ssh]# mv id_dsa.pub authorized_keys 

最终实现ssh的免密码登陆。

SSH免密码登陆效果：

Java代码 
[root@localhost .ssh]# ssh root@192.168.0.60 
Last login: Tue Sep 27 09:03:10 2011 from 192.168.0.3 
[root@web1 ~]#  

作者“天堂鸟”