Linux on ngmarley.com

Remove Ubuntu/Debian version from sshd server string

Wed, 02 Jan 2013 00:00:00 +0000

For security reasons, I don’t like that “Debian/Ubuntu” shows up on my sshd server string.

You can see the sshd server identification string by telnetting to port 22.

$ telnet ngmarley.com 22 Trying 106.187.97.211... Connected to ngmarley.com. Escape character is '^]'. SSH-2.0-OpenSSH_6.0p1 Debian-3ubuntu1 ^] telnet> quit Connection closed.

It’s very simple to just remove the “Debian…” part off the end.

Just edit /etc/ssh/sshd_config and append

DebianBanner no

to it.

Then re-start your sshd:

basic Perl log function

Wed, 30 Jun 2010 00:00:00 +0000

I believe any good Perl utility should have a log to which pertinent information should be written. I’m not even going to go over the merits of having a log file, but all good scripts should have one.

Setup - Define the Function and Log Filename

Here’s the log function which I use in my Perl scripts. This could easily be exported to a log module. Yes, I realize there are probably a lot of good logging modules out there already, I’m just offering this for the lazy sods who don’t currently log anything in their Perl scripts, but realize that it’s a good idea to start.

Linux shared library error

Mon, 03 May 2010 00:00:00 +0000

Note: this was originally written on Apr 23, 2010, so that’s why the dates are from about a week and a half ago. Because I’m a lazy sod, I didn’t get around to publishing this until now.

After installing ntp on my Arch Linux server via pacman, I received this error message while trying to update my system time with ntpdate:

# ntpdate ntpdate: error while loading shared libraries: libcrypto.so.1.0.0: cannot open shared object file: No such file or directory