SSH配置无密码登录

步骤1: 用 ssh-key-gen 在本地主机上建立公钥和密钥

root@localhost$ ssh-keygen -t  rsa 

Enter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key] 

Enter passphrase (empty for no passphrase): [Press enter key] 

Enter same passphrase again: [Pess enter key] 

Your identification has been saved in /home/jsmith/.ssh/id_rsa. 

Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub. 

The key fingerprint is: 33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 

步骤2: 用 ssh-copy-id 把公钥复制到远程主机上 

root@localhost$ ssh-copy-id -i ~/.ssh/id_rsa.pub  root@192.168.0.3 

root@remote-host‘s password: 

Now try logging into the machine, with ―ssh ?remote-host‘‖, and check in: 

            .ssh/authorized_keys 

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

步骤3: 直接登陆远程主机 

root@localhost$ ssh root@192.168.0.3 

Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2 

ligh@remote-host$