清除原有ssh密钥方法

通常我们在第一次ssh连接某个服务器时会提示我们保存密钥，以后就不会再提示了，可是如果远程主机更换了密钥或者重新安装了系统什么的，我们就会提示错误，提示我们密钥验证失败

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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:fc5h14Rmq6Vr9R6AC3Tk3zDjYUET5+y1qQC9MDG19eA.

Please contact your system administrator.

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

Offending RSA key in /Users/cuishengjie/.ssh/known_hosts:11

RSA host key for 122.10.90.231 has changed and you have requested strict checking.

Host key verification failed

这时候，我们只要清楚我原有登录信息就好了。

我们执行命令

ssh-keygen -R 你的远程服务器ip

然后我们重新连接就好了，熟悉的提示又回来了