CentOS建立免密碼SSH（密鑰）

1、輸入以下命令：ssh-keygen -t rsa

2、輸入命令ls：產生兩個檔案：id_rsa id_rsa.pub

3、複製id_rsa.pub，並命名為authorized_key

cp ~/.ssh/id_rsa.pub  ~/.ssh/authorized_keys

4、執行ssh localhost。

驗證成功：

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.