ssh 登陆时，遇到 host key verifycation failed 的情况1
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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:MU0btYHPprmjRMfcs6mtciH407u1hCJzz71wG7EuUUE.
Please contact your system administrator.
Add correct host key in /Users/banshee/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/banshee/.ssh/known_hosts:12
ECDSA host key for [xxx.xxx.xxx.xx]:xxxx has changed and you have requested strict checking.
Host key verification failed.
出现这种情况的原因是，第一次 SSH 连接服务器时，会生成一个公钥，存储在客户端的 known_ host 文件里。而我的服务器重装了系统，生成了新的公钥，而客户端known_hsot 里还保存着旧的公钥。所以会出现以上错误。
解决方式也很简单：
- 使用命令
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ssh-keygen -R xx.xx.xx.xx:pp(IP:PORT)
或者直接vim 进去删除服务器IP对应的记录。
再次连接，会出现接受服务器公钥的询问，输入 yes 即可。