WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED 问题

1.问题描述

最近重装了41机器，我在40重新ssh登录41机器时出现一下警告：

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
06:50:e8:53:74:0e:1f:ab:fb:4c:86:35:f8:c7:aa:0c.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:1
RSA host key for 10.10.136.41 has changed and you have requested strict checking.

2.问题分析

这个是因为ssh会把你每个你访问过计算机的公钥(public key)都记录在~/.ssh/known_hosts。当下次访问相同计算机时，OpenSSH会核对公钥。如果公钥不同，OpenSSH会发出警告， 避免你受到DNS Hijack之类的攻击。由于我重装了41机器，所以公钥不一样，出现以上这些警告

3. 问题解决

最简单的办法就是把40上~/.ssh/knows_hosts 里和 41相关的KEY信息删除掉。重新ssh登录就正常了

4.问题参照:

THANKS

http://linuxme.blog.51cto.com/1850814/375752