版权声明：随意转载，需注明出处。by think_ycx https://blog.csdn.net/think_ycx/article/details/88366057
我们使用ssh-keygen登陆服务的时候，如果是第一次登陆，会返回server的信息要求我们确认，如果没问题，输入yes之后就会发送我们的private key用于认证，个人觉得这是为了防止private key泄漏。但是如果该ip对应的服务器变更了（如在vps销毁了服务器又重新申请到一个相同ip的服务器），再ssh登陆时通常会遇到下面的错误。
错误日志：
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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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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 a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:Zguo2pYQI44wxwif5W7Y0VyQpvRYiLA4RQUtCV3Sz0s.
Please contact your system administrator.
Add correct host key in /XXXX/XXXX/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /XXXX/XXXX/.ssh/known_hosts:39
ECDSA host key for 149.28.XX.XX has changed and you have requested strict checking.解决办法：
ssh-keygen -R ip #从known_hosts中删除对应的entry，这样再ssh时就相当于是一台新的服务器了。
-R hostname Removes all keys belonging to hostname from a known_hosts file. This option is useful to delete hashed hosts (see the -H option above).
参考
https://stackoverflow.com/questions/20840012/ssh-remote-host-identification-has-changed