快速创建SSH信任实现无密码登录

1. 生成本机的公私钥匙对
[oracle@Oracle11_2 scripts]$ ssh-keygen -b  -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/oracle/.ssh/id_rsa): (Enter)
Created directory '/home/oracle/.ssh'.
Enter passphrase (empty for no passphrase): (Enter)
Enter same passphrase again:
Your identification has been saved in /home/oracle/.ssh/id_rsa.
Your public key has been saved in /home/oracle/.ssh/id_rsa.pub.
The key fingerprint is: (Enter)
ab:a8::::f8::3f:f5:fd:c3:8b:::7b:e6 oracle@Oracle11_2
The key's randomart image is: (Enter)
+--[ RSA ]----+
| .               |
|. .              |
| o               |
|+ . .            |
| = . . .S        |
|  + . . ..       |
|   =    .= .     |
|  o  . .o.O      |
|  .o. . o*Eo     |
+-----------------+

2. 将本机的公钥复制到远程机器的authorized_keys文件中，ssh-copy-id也能让你有到远程机器的home, ~./ssh , 和 ~/.ssh/authorized_keys的权利
[oracle@Oracle11_2 scripts]$ ssh-copy-id -i ~/.ssh/id_rsa.pub Oracle11
The authenticity of host 'oracle11 (192.168.199.67)' can't be established.
RSA key fingerprint is ::e3:2c:5b::f2:a5::e0:2c::b9::dd:d6.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'oracle11,192.168.199.67' (RSA) to the list of known hosts.
oracle@oracle11's password:
Now try logging into the machine, with "ssh 'Oracle11'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

3. 测试
[oracle@Oracle11_2 scripts]$ ssh Oracle11
[oracle@Oracle11 ~]$ exit
logout
Connection to Oracle11 closed.

参考：http://blog.chinaunix.net/uid-26284395-id-2949145.html

http://blog.sina.com.cn/s/blog_68158ebf0100vf8l.html