如何解决“Offending key in ~/.ssh/known_hosts” file

Remove the offending ssh key
Following error will be displayed when the remote host key changes (after you’ve connected earlier with a valid remote host key).

[javascript] view plain copy
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
a7:a8:f2:97:94:33:58:b7:9d:bc:e0:a6:6b:f7:0a:29.
Please contact your system administrator.
Add correct host key in /home/ramesh/.ssh/known_hosts to get rid of this message.
Offending key in /home/ramesh/.ssh/known_hosts: 6
Permission denied (publickey,password).

You have to remove the key to proceed further. Use the following command to remove the offending key.
[javascript] view plain copy

sed -i ‘6d’ ~/.ssh/known_hosts

Note: Change the 6d according to the line number shown.

If your sed does not have -i option, use perl or use some editor to remove the offending key.

Perl solution:

[javascript] view plain copy

perl -pi -e ‘s/\Q//if(. == 6);’ ~/.ssh/known_hosts

Note: Change the line number from 6 to appropriate line number.

转载自：
http://blog.csdn.net/fisher_jiang/article/details/7351343