SSH连接至 Linux 服务器（ssh 10.229.142.30）时，出现以下错误：
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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
d7:a3:d6:e1:d6:a8:4f:64:d9:87:08:43:55:c5:a5:1d.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:30
ECDSA host key for 10.229.142.30 has changed and you have requested strict checking.
Host key verification failed.
出现这个问题的原因是,第一次使用SSH连接时，会生成一个认证，储存在客户端的known_hosts中.
可使用以下指令查看：
ssh-keygen -l -f ~/.ssh/known_hosts
由于服务器重新安装系统了，所以会出现以上错误。
解决方法：
ssh-keygen -R 服务器端的ip地址
这里的执行：ssh-keygen -R 10.229.142.30
此命令是重新生成认证密钥。
执行完上面的命令后，再执行ssh 10.229.142.30,
出现以下提示：
The authenticity of host '10.229.142.30 (10.229.142.30)' can't be established.
ECDSA key fingerprint is d7:a3:d6:e1:d6:a8:4f:64:d9:87:08:43:55:c5:a5:1d.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.229.142.30' (ECDSA) to the list of known hosts.
Password:
输入密码，就可以啦。
