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Category Archives: System Administration

How to get a Free and Valid SSL Certificate

Posted on September 22, 2011 by Poul PetersenMay 30, 2017

UPDATE

Startcom is now at this URL. And although the certs are still free, they no longer work with things like Chrome, or Safari, or Firefox… which doesn’t leave much 😉

I’m still investigating other free SSL services…

Why do you need a SSL certificate?

… Continue reading →
Posted in System Administration | Tagged certificate, https, ssl

IPMI SOL – Inexpensive Remote Console

Posted on April 19, 2011 by Poul PetersenApril 20, 2011

I used to think that every server needed to have something like a DRAC (Dell Remote Access Card) or IBM RSA (IBM Remote System Administration) to be really manageable remotely. But the problem is that they are expensive and they are barely functional.… Continue reading →

Posted in System Administration | Tagged command_line, linux, remote_access

Process Substitution – Subshells that Rock

Posted on March 2, 2011 by Poul PetersenJanuary 4, 2012

If you are new to the world of *nix operating systems, you might still be wrapping your head around the concept of pipes. But if you spend any time at the command line, it won’t be long before you are throwing commands together with more pipes than a high rise plumbing job.… Continue reading →

Posted in System Administration | Tagged command_line, linux

Common Cron Mistakes

Posted on February 26, 2011 by Poul PetersenMarch 3, 2011

I’ve been working with personal computers for awhile. I’m not quite from the punch card era, but I do fondly remember saving my prime number sieve program, written in basic, to an audio cassette attached to a Commodore Vic-20. Somewhere I still have the 24-pin dot matrix printout of all the prime numbers less than 1,000,000.… Continue reading →

Posted in System Administration | Tagged linux

Project Hydra: the USB Multiheaded Monster

Posted on July 6, 2004 by Poul PetersenMarch 1, 2011

“You have a bunch of servers to administer, not enough consoles and a small budget. Roll your own serial console server with USB.”

This is a paper I wrote for Linux Journal after playing around with using USB<->serial adaptors to build a scaleable serial console solution.… Continue reading →

Posted in System Administration | Tagged remote_access

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android certificate command_line game https iphone linux mathematics mobile password remote_access security ssl

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