实现ssh无密码登录的实现方法：
步骤1: 用 ssh-key-gen 在本地主机上创建公钥和密钥
先在本机上创建一个文件夹执行命令：mkdir .ssh
接着生成公钥和密钥，执行命令：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
ligh@local-host
步骤2: 用 ssh-copy-id 把公钥复制到远程主机上
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.0.3
ligh@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.
[注: ssh-copy-id 把密钥追加到远程主机的 .ssh/authorized_keys 上.]
步骤3: 直接登录远程主机
ssh remote-host
Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2