ssh无需密码登录linux服务器

蚂蚁没问题

使用下例中ssky-keygen和ssh-copy-id，仅需通过3个步骤的简单设置而无需输入密码就能登录远程Linux主机。
ssh-keygen 创建公钥和密钥。
ssh-copy-id 把本地主机的公钥复制到远程主机的authorized_keys文件上。
ssh-copy-id 也会给远程主机的用户主目录（home）和~/.ssh, 和~/.ssh/authorized_keys设置合适的权限 。

步骤1: 用 ssh-key-gen 在本地主机上创建公钥和密钥

1. ligh@local-host$ ssh-keygen -t rsa
   
2. Enter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key]  
   
3. Enter passphrase (empty for no passphrase): [Press enter key]
   
4. Enter same passphrase again: [Pess enter key]
   
5. Your identification has been saved in /home/jsmith/.ssh/id_rsa.
   
6. Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub.  
   
7. The key fingerprint is: 33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9  
   
8. ligh@local-host

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步骤2: 用 ssh-copy-id 把公钥复制到远程主机上

1. ligh@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.0.3
   
2. ligh@remote-host‘s password:
   
3. Now try logging into the machine, with ―ssh ?remote-host‘‖, and check in:  
   
4. .ssh/authorized_keys to make sure we haven‘t added extra keys that you weren‘t expecting.

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[注: ssh-copy-id 把密钥追加到远程主机的 .ssh/authorized_key 上.]

1. ligh@local-host$ ssh remote-host  
   
2. Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2  
   
3. ligh@remote-host[        DISCUZ_CODE_11        ]nbsp;

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[注: 你现在已经登录到了远程主机上]

nswcfd

good,  以前第二步都是手工操作，原来有现成的命令啊。

lyhabc

很早已经有了
http://blog.chinaunix.net/uid-26284395-id-2949145.html

woxizishen

http://bbs.chinaunix.net/thread-4162576-1-1.html
楼主不是原版的，看看上面openssh应用无需输账号和密码的三个不同应用案例

Shell_HAT

http://blog.chinaunix.net/uid-10038128-id-2759648.html
http://bbs.chinaunix.net/thread-3619435-1-1.html