Please contact your system administrator. Add correct host key in /Users/***/.ssh/known_hosts

Please contact your system administrator. Add correct host key in /Users/***/.ssh/known_hosts

macOS系统下ssh root@hostname时遇到如下问题的解决方案：

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 
The RSA host key for********.com has changed, 
and the key for the corresponding IP address **** 
is unknown. This could either mean that 
DNS SPOOFING is happening or the IP address for the host 
and its host key have changed at the same time. 
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 
@ 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 
************************. 
Please contact your system administrator. 
Add correct host key in /Users/***/.ssh/known_hosts to get rid of this message. 
Offending key in /Users/*/.ssh/known_hosts:1 
RSA host key for************** has changed and you have requested strict checking. 
Host key verification failed.

方法1：使用TextMate之类的文本编辑器打开～/.ssh/known_hosts的文件，把hostname对应的行删掉（行首就是你的hostname了，注意：这里的行通常很长，编辑器可能会自动换行。找不到对应的行就全删了也没关系，怕出问题的话可以先备份一下），重新执行命令即可。

方法2：使用命令行工具（推荐iTerm）执行ssh-keygen -R hostname即可