ssh連線時，發生遠端主機認証資料已經改變的錯誤訊息

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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:sTZh1ToLgA3719MjTD+Hnvbfb2HXXKtOk7uvp3Us23s.
Please contact your system administrator.
Add correct host key in /home/chunkai/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/chunkai/.ssh/known_hosts:3
  remove with:
  ssh-keygen -f "/home/chunkai/.ssh/known_hosts" -R 192.168.30.9
ECDSA host key for 192.168.30.9 has changed and you have requested strict checking.
Host key verification failed.

上面是最近常出現的訊息，這是因為進行ssh連線時，本機端會將伺服器端的金鑰與IP對應紀錄，寫入到

/home/使用者/.ssh/know_hosts

但是因為我裝了許多台虛擬主機，不同台的虛擬主機重啟後卻有可能使用同一組IP，如此一來本機端的know_hosts紀錄對應不符（另一種狀況，當然就是伺服器有重新安裝過，似服主機的金鑰碼又會不一樣囉，這樣也會產生對應不符的情形），就會出現上述的錯誤。只要照著他提示的建議：

ssh-keygen -f "/home/chunkai/.ssh/known_hosts" -R 192.168.30.9

重新建立know_hosts紀錄。