REMOTE HOST IDENTIFICATION HAS CHANGED问题的解决方式

好久没更新博客园。

这段没更新博客的时间内收获了很多，所以更新下博客来整理、记录这段时间内学到的内容。

最近腾讯云服务器欠费停机了，所以趁着缴费、趁着心血来潮就……重装了云系统。结果在进行远程ssh连接的时候，报错了。

“REMOTE HOST IDENTIFICATION HAS CHANGED”

我记得很久以前我连接是没问题的啊！于是开始疯狂百度，弄了各种解决方案，最后发现还是简书最靠谱（容我做一个悲伤的表情）

下面内容基本上就是原封不动搬运过来了：

报错内容为：

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
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.

其实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。

可以用以下指令查看：

ssh-keygen -l -f ~/.ssh/known_hosts

由于服务器重装了系统，所以存储在客户端的认证也就会失效。所以需要重新更新该认证：

#格式：ssh-keygen -R 服务器端的ip地址
ssh-keygen -R 192.168.1.1

运行后会弹出以下提示：

Host 192.168.3.10 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

然后重新连接，会弹出以下提示：

The authenticity of host '192.168.3.10 (192.168.3.10)' 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”并回车即可～

最后，真的很感谢简书作者GkFool，教程地址如下：http://www.jianshu.com/p/04328ed5970e