[Centos] ssh 원격 접속 장애 (WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!)

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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:lE9TM7sHONclMNYVtHrwfefdIV3lsn88ZJLuWYc6Rz8.
Please contact your system administrator.
Add correct host key in /Users/md/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/md/.ssh/known_hosts:1
RSA host key for XXX.XXX.XXX.XXX has changed and you have requested strict checking.
Host key verification failed.

원인은 재설치한 Centos에 ssh을 접속하였기 때문이라고 한다.
이전에 접속한 RSA 키 값으로 자꾸 접속하려니까 맞지 않았던 것이라고..
결론은 지우면 된다는거.

ssh-keygen -R [ IP or DomainName]

상단의 내용을 치니, 다음과 같이 나온다.
# Host XXX.XXX.XXX.XXX found: line 1
/Users/md/.ssh/known_hosts updated.
Original contents retained as /Users/md/.ssh/known_hosts.old

이렇게 뜬다면 성공한 것이다.