今天把阿里云镜像重置了一下，再ssh连接的时候报这个错误：

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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:crMaNSzbphrZgoNGuprFU0Q/lBeLJzcChqCvViU6A9A.
Please contact your system administrator.
Add correct host key in /Users/zhangweikang/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/zhangweikang/.ssh/known_hosts:19
ECDSA host key for 101.132.129.214 has changed and you have requested strict checking.
Host key verification failed.

会出现这些信息是因为，第一次SSH连接时，会生成一个认证，储存在客户端（也就是用SSH连线其他电脑的那个，自己操作的那个）中的known_hosts，但是如果服务器验证过了，认证资讯当然也会更改，服务器端与客户端不同时，就会跳出错误啦～因此，只要把电脑中的认证资讯删除，连线时重新生成，就一切完美啦～要删除很简单，只要在客户端输入一个指令:

ssh-keygen -R + 服务器的IP

接下來再次连接一次，会出现

Are you sure you want to continue connecting (yes/no)?

输入yes，就完成连接啦！同时，新的认证也生成了