今天通过ssh链接Ubuntu服务器
192:~ mysite$ ssh ubuntu@xxx.xx.xx.xxx
出现如下错误提示信息：
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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:Nrw48y2B4eQuc2LNhL0edaFnOcX4.
Please contact your system administrator.
Add correct host key in /Users/mysite/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/mysite/.ssh/known_hosts:1
ECDSA host key for xxx.xx.xx.xxx has changed and you have requested strict checking.
Host key verification failed.
错误提示中出现关键词：
Add correct host key in /Users/mysite/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/mysite/.ssh/known_hosts:1
原因是在主机子系统每次成功ssh连接远程操作，都会把你每个你访问过计算机的公钥(public key)都记录在主机的目录/Users/icarus/.ssh/known_hosts下，当下次访问相同子机服务器时，会核对公钥。如果公钥不同，会发出警告，避免你受到DNS Hijack之类的攻击。
解决办法：
进入目录删除文件即可，然后重新连接就能发现连接上了。
192:~ mysite$ cd ~/.ssh/
192:.ssh mysite$ rm known_hosts
重新使用ssh链接服务器即可使用。
参考链接：参考链接
