rsa证书可以同时登录ubuntu和centos等linux系统
主控端生成证书并发送公匙到被控端
ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
cat ~/.ssh/id_rsa.pub>> ~/.ssh/authorized_keys
scp ~/.ssh/id_rsa.pub www.gaojinbo.com:~/.ssh/被控端添加公匙
mkdir .ssh && cat ~/id_rsa.pub>> ~/.ssh/authorized_keys
