三步配置SSH 免密码登录

Step1:在 Client 端建立 Public 与 Private Key

$ssh-keygen -t dsa <==这个步骤产生 Keys
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_dsa): <== 按下 Enter
Enter passphrase (empty for no passphrase): <== 按 Enter
Enter same passphrase again: <== 再按一次 Enter
Your identification has been saved in /root/.ssh/id_dsa. <== 私钥
Your public key has been saved in /root/.ssh/id_dsa.pub. <== 公钥
The key fingerprint is:
c4:ae:d9:02:d1:ba:06:5d:07:e6:92:e6:6a:c8:14:ba test@test.com

Step2 : 在 Server 端放置 Client 可以登入的公钥

$cd ~/.ssh
$scp id_dsa.pub root@192.168.1.1:~/

Step3 : 登入到 Server 端，将公钥转存到 authorized_keys 文件中

$ssh 192.168.1.1
$cat id_dsa.pub >> .ssh/authorized_keys

Ya!!! 大功告成！

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