[user1@rh user1]$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/user1/.ssh/id_rsa): Created directory '/home/user1/.ssh'. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/user1/.ssh/id_rsa. Your public key has been saved in /home/user1/.ssh/id_rsa.pub. The key fingerprint is: e0:f0:3b:d3:0a:3d:da:42:01:6a:61:2f:6c:a0:c6:e7 user1@rh.test.com [user1@rh user1]$生成的过程中提示输入密钥对保存位置，直接回车，接受默认值就行了。接着会提示输入一 个不同于你的password的密码，直接回车，让它空着。当然，也可以输入一个。(我比较懒 ，不想每次都要输入密码。) 这样，密钥对就生成完了。 其中公共密钥保存在 ~/.ssh/id_rsa.pub 私有密钥保存在 ~/.ssh/id_rsa 然后改一下 .ssh 目录的权限，使用命令 "chmod 755 ~/.ssh"
[user1@rh user1]$ chmod 755 ~/.ssh [user1@rh user1]$之后把这个密钥对中的公共密钥复制到你要访问的机器上去，并保存为 ~/.ssh/authorized_keys.
[user1@rh user1]$ scp ~/.ssh/id_rsa.pub rh1:/home/user1/.ssh/authorized_keys user1@rh1's password: id_rsa.pub 100% 228 3.2MB/s 00:00 [user1@rh user1]$之这样就大功告成了。之后你再用ssh scp sftp 之类的访问那台机器时，就不用输入密码 了，用在script上更是方便。