SSH免密码登录连接失败：Host key verification failed

最近更换了一部分服务器，一部分没有更换，在原来的机器上ssh登录其他机器的时候被拒了。

执行： SSH xxx.xxx.xxx.xxx

结果：

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@ 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 is

a1:ee:9e:76:32:ab:79:83:21:c1:d1:eb:35:44:fe:b4.

Please contact your system administrator.

Add correct host key in /root/.ssh/known_hosts to get rid of this message.

Offending key in /root/.ssh/known_hosts:13

RSA host key for 10.0.0.10 has changed and you have requested strict checking.

Host key verification failed.

解决方案：

直接删除/root/.ssh/known_hosts这个文件