在线辅导课非常多，但仍录，使用时方便日后查询。
两server,内联网ip每间：
172.16.3.91 （本地计算机）
172.16.3.92 （远程机）
现在想在本地计算机上通过ssh 172.16.3.92到远程机而不须要password。
1.在本地机上用ssh-keygen 创建公钥私钥。
[root@rs-1 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
dc:fc:ea:b8:bb:74:d7:75:4b:6a:27:82:28:27:be:d6 root@rs-1
这个过程会提示输入password，记住直接按回车即可。不要输入password！要是输入了password，一会訪问的时候就须要输入password了。
创建之后能看到例如以下两个文件
[root@rs-1 .ssh]# ll
total 24
-rw------- 1 root root 1675 May 8 07:18 id_rsa
-rw-r--r-- 1 root root 391 May 8 07:18 id_rsa.pub
id_rsa是私钥
id_rsa.pub是公钥。 主要给远程机使用的
2.把公钥传到远程机上去。
[root@rs-1 .ssh]# scp id_rsa.pub root@172.16.3.92:~/.ssh/authorized_keys
Address 172.16.3.92 maps to localhost, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
root@172.16.3.92's password:
id_rsa.pub 100% 391 0.4KB/s 00:00
3.ssh链接时候就不须要password了，直接登陆到远程机
[root@rs-1 .ssh]# ssh 172.16.3.92
Address 172.16.3.92 maps to localhost, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
Last login: Thu May 8 07:19:28 2014 from 172.16.3.91
[root@rs-2 ~]#
參考：http://blog.csdn.net/gongqingkui/article/details/9023439
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