问题描述：运行ssh报如下错误
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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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
23:00:20:83:de:02:95:f1:e3:34:be:57:3f:cf:2c:e7.
Please contact your system administrator.
Add correct host key in /home/xahria/.ssh/known_hosts to get rid of this message.
Offending key in /home/xahria/.ssh/known_hosts:8
RSA host key for localhost has changed and you have requested strict checking.
Host key verification failed.
问题分析：估计是RSA key不匹配
问题解决：修改安全配置
打开.ssh/config（或者/etc/ssh/ssh_config）
找到并修改为：
StrictHostKeyChecking no
UserKnownHostsFile /dev/null