MAC远程连接服务器，不需要输入密码的配置方式

cd ~/.ssh  
#没有则需要创建一个。
mkdir ~/.ssh  
ssh-keygen -t rsa  
cd ~/.ssh  
scp id_rsa.pub root@IP地址:~/.ssh/id_rsa.pub 
ssh root@IP地址  
cd ~/.ssh  
cat id_rsa.pub >> authorized_keys  
rm id_rsa.pub  
exit