1、输入以下命令：ssh-keygen -t rsa
2、输入命令ls：产生两个文件：id_rsa id_rsa.pub
3、复制id_rsa.pub，并命名为authorized_key
cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
4、执行ssh localhost。
验证成功：
The authenticity of host 'localhost (::1)' can't be established.
RSA key fingerprint is 07:07:8e:1c:c0:7e:7f:1f:ca:6a:e6:d3:cb:7f:b7:a1.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'localhost' (RSA) to the list of known hosts.