最近之前使用的一台linux服务器被长官重装系统了，导致ssh登录的时候出现如下错误：
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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 RSA key sent by the remote host is
SHA256:az7FfVtBpsebsnnIN5nAyqBzE3oEmTYcTd/bJu+yp38.
Please contact your system administrator.
Add correct host key in /home/kaixi_fan/.ssh/known_hosts to get rid of this message.
Offending RSA key in /home/kaixi_fan/.ssh/known_hosts:2
RSA host key for 172.29.38.37 has changed and you have requested strict checking.
Host key verification failed.
看起来是ssh key我本地终端和服务器保存的，2者对不上了，这时候可以这么办：
删除提示信息中，对应的行数，例如上例，需要删除 /home/kaixi_fan/.ssh/known_hosts文件的第2行。
然后重新登录，会给出如下提示：
The authenticity of host '172.29.38.37 (172.29.38.37)' can't be established.
ECDSA key fingerprint is xxxxxxxxxxxxxxxxxxxxxxxxxx（此处是key）
Are you sure you want to continue connecting (yes/no)? yes（输入yes）
Warning: Permanently added '172.29.38.37' (ECDSA) to the list of known hosts.
重新输入yes就好啦。