ssh公钥配置

ssh-keygen -t rsa

A主机上操作
$ cat /root/.ssh/id_rsa.pub | ssh root@远程服务器ip 'cat - >> ~/.ssh/authorized_keys'
B主机上操作
$ chmod 600 ~/.ssh/authorized_keys

$ vim /etc/ssh/sshd_config
PubkeyAuthentication yes  //将该项改为yes    
sudo service sshd restart