阿里云服务器换了镜像，ip更改了。导致原来的ssh key失效了，提示报错如下：KENFORFORLIN:~ kenforstar$ sudo ssh root@192.168.1.203Password:@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!Someone could be eavesdropping on you right now (man-in-the-middle attack)!It is also possible that the RSA host key has just been changed.The fingerprint for the RSA key sent by the remote host isea:24:31:8d:03:07:36:db:2f:74:15:5d:58:67:a3:5b.Please contact your system administrator.Add correct host key in /var/root/.ssh/known_hosts to get rid of this message.Offending key in /var/root/.ssh/known_hosts:1RSA host key for 192.168.1.203 has changed and you have requested strict checking.Host key verification failed.解决方法：ssh-keygen -R 192.168.1.203(你远程服务器的IP)