Ssh complains host id has been changed

David Hrbáč — Mon, 24 Oct 2011 10:30:04 +0000

There are situations when host id might be changed a few times during fast, automatic, and massive host deployment. Ssh client begins to complain on changed host id.

[root@builder2 ~]# ssh webmel53
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
7f:14:74:68:ca:9e:e2:ec:1c:44:8c:ea:29:a9:84:60.
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:80
RSA host key for webmel53 has changed and you have requested strict checking.
Host key verification failed.

Quick and easy step follows:

[root@builder2 ~]# ssh-keygen -R !$
ssh-keygen -R webmel53
/root/.ssh/known_hosts updated.
Original contents retained as /root/.ssh/known_hosts.old

Send file as attachment from commnad line

David Hrbáč — Mon, 18 Jan 2010 13:04:28 +0000

There’s an easy way of sending files as attachment from command line:

uuencode file name | mail -s "Subject" "to@tld.cz"  -- -ffrom@tld.cz

Yes, there is double hyphen and -f before the from email address.

David Hrbáč » bash

Ssh complains host id has been changed

Send file as attachment from commnad line