服务器重置了系统，再次连接ssh后报错

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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:WD831i/lF/k5pFzATjGUpOno2sjJHh5WwrGU5ELMIIQ.
Please contact your system administrator.
Add correct host key in /home/salt/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/salt/.ssh/known_hosts:64
ECDSA host key for 47.30.125.39 has changed and you have requested strict checking.
Host key verification failed.

这是因为远程服务器的公钥被修改，与本地保存的远程服务器公钥不相符， SSH在第一次连接远程服务器时，会把对方公钥存到本地的~/.ssh/known_hosts 文件中，所以把这个文件中对应服务器IP的部分删除，保存，重新连接即可。

命令行解决方法， 执行如下命令，替换IP

ssh-keygen -R 47.30.125.39

或者手动删除此IP的部分

vim ~/.ssh/known_hosts

找到对应IP部分删除，保存。