今天重裝VPS的系統，SSH的密碼發生改變，重新使用SSH鏈接服務器時報錯。
報錯代碼：
deisre-deMac:~ hitsujisaruhiroshi$ ssh -l root -p 27714 98.64.108.168
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@? ? 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 RSA key sent by the remote host is
SHA256:e05AhWJxSQjdDADFAGDFGa/x00CKu8/6sEIqQgfcs.
Please contact your system administrator.
Add correct host key in /Users/hitsujisaruhiroshi/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/hitsujisaruhiroshi/.ssh/known_hosts:4
RSA host key for [98.64.108.168]:27714 has changed and you have requested strict checking.
Host key verification failed.
問題原因：
deisre-deMac:.ssh hitsujisaruhiroshi$ ls known_hosts known_hosts.old
known_hosts 是記錄遠程主機的公鑰的文件，之前重裝個系統，而保存的公鑰還是未重裝系統的系統公鑰，在 ssh 鏈接的時候首先會驗證公鑰，如果公鑰不對，那么就會報錯。
解決方法：
方法一：刪除ssh client 端文件?中對應記錄信息即可。
1. 終端輸入 vi ~/.ssh/known_hosts
2.鍵盤輸入“i”，切換至輸入模式。
3.刪除對應記錄信息后，使用“Esc”退出輸入模式
[98.64.108.168]:27714 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEEWRQWSwg9+LEIvElXiiyO/AixHsIy6uzFmEd5utfEbMNL3IzWmLPfjUNjPsMBLwqerqwereDmeuvH+E8yMi/hC9DUwX4+fTSdfD/KzHneqB6MhhgbMLmni+un7EsagdsfsafsdgVXkoUD0KCD0OoRVDgHXJSw1HcA/W74/XXYX5hZ4DZyG5PqDDuPiO4RDNYDizW4rQKScA+X2YnMADSFA
4.輸入“:wq”保存修改記錄
5.重新連接SSHdeisre-deMac:~ hitsujisaruhiroshi$ ssh -l root -p?27714?98.64.108.168The authenticity of host '[98.64.108.168]:27714?([98.64.108.168]:27714)' can't be established.RSA key fingerprint is SHA256:e05AhWJxSQjddJbzLk2B3JHa/x00CKu8/6sEIqQgfcs.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '[98.64.108.168]:27714' (RSA) to the list of known hosts.
6.終端輸入yes完成連接
方法二：清除老的公鑰信息。
1.?終端輸入? ssh-keygen -R 98.64.108.168
#后面填自己服務器的 ip 地址
2.終端顯示Host 98.64.108.168?found: line 1 type RSA
3.重新連接SSH
deisre-deMac:~ hitsujisaruhiroshi$ ssh -l root -p 27714 98.64.108.168
The authenticity of host '[98.64.108.168]:27714 ([98.64.108.168]:27714)' can't be established.
RSA key fingerprint is SHA256:e05AhWJxSQjddJbzLk2B3JHa/x00CKu8/6sEIqQgfcs.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[98.64.108.168]:27714' (RSA) to the list of known hosts.
4.終端輸入 yes 完成連接
