今天处理 ssh连接至 ubuntu 服务器时，提示以下错误：
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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 RSA key sent by the remote host is
da:f7:3e:ba:f7:00:e6:44:76:f2:58:6e:48:******.
Please contact your system administrator.
Add correct host key in /用户home目录/.ssh/known_hosts to get rid of this message.
Offending RSA key in /用户home目录/.ssh/known_hosts:1
RSA host key for ip地址 has changed and you have requested strict checking.
Host key verification failed.
经过google,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。
解决办法
ssh-keygen -R 服务器端的ip地址
会出现以下提示：
# Host [服务器IP] found: line 1 type RSA
/用户home目录/.ssh/known_hosts updated.
Original contents retained as /用户home目录/.ssh/known_hosts.old
重新连线,出现以下提示：
The authenticity of host '[服务器IP] (服务器IP)' can't be established.
RSA key fingerprint is da:f7:3e:ba:f7:00:e6:44:76:f2:58:6e:48:****.
Are you sure you want to continue connecting (yes/no)?
输入yes确认即可连线成功。
