当我们使用ssh root@ip登录Linux服务器时，服务器报错：”ECDSA host key for ip has changed and you have requested strict checking. Host key verification failed.“
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aliyunbaike@aliyundeMacBook–Pro:~$ ssh root@47.74.190.156
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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:Ms+BRn93GbOO1fwP6g1O+UwSRFv9KIUMGeoHDt70OfQ.
Please contact your system administrator.
Add correct host key in /Users/aliyunbaike/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/aliyunbaike/.ssh/known_hosts:6
ECDSA host key for 47.74.190.156 has changed and you have requested strict checking.
Host key verification failed.
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这是由于，ssh连接服务器时，如果之前连接过，ssh会默认保存该ip的连接协议信息，当我们再次访问此ip服务器时，ssh会自动匹配之前ssh保存的信息，由于我们的服务器做了更改，例如重装系统等操作，会导致本地保存的ssh信息失效，于是再次连接时就会出现上述错误。
另外，远程服务器的ssh服务被卸载重装或ssh相关数据（协议信息）被删除也会导致这个错误。
删除本地known_hosts里面的缓存信息即可。命令：ssh-keygen -R "你的远程服务器ip地址"
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aliyunbaike@aliyundeMacBook–Pro:~$ ssh–keygen –R “47.74.190.156”
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删除本地的ssh keygen信息后，再次通过ssh root@ip登录应该就不会报错了。
注意：R是大写！
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