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Category Archives: System Administration

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The Magic of Rsync

Posted on January 27, 2014 by lukeJanuary 27, 2014

Without question, rsync is one of a handful tools required for any systems administrator to keep their heads above water. It hooks in wonderfully with other tools to allow synchronization of files across a wide variety of media. COW, unionfs, … Continue reading →

Posted in System Administration

Software RAID and Linux

Posted on January 22, 2014 by lukeJanuary 22, 2014

Part of my day to day activities is to support RedHat Enterprise Linux on the desktop. To demo software that runs natively on Linux, I firmly believe that the only bottleneck should be the system itself: no virtualization, no networking, … Continue reading →

Posted in System Administration

Converting Data to QR Code Video

Posted on October 25, 2013 by lukeOctober 25, 2013

One of the things I enjoy about computing is trying something silly, just to see what happens. Ever wonder what a live well of rainbow trout looks like as a QR code video? Well, look no further! The tools involved … Continue reading →

Posted in Ruminations, System Administration

Cryptsetup and LUKS

Posted on February 2, 2012 by lukeFebruary 10, 2013

Ever have a hard drive go bad, yet hesitate to RMA it? That’s understandable. Who knows what people on the other end will do, once it is repaired. Once simple solution is to encrypt the contents of the hard disk. … Continue reading →

Posted in Scripts and Howtos, System Administration

Executable Hijinks

Posted on December 21, 2011 by lukeDecember 30, 2012

In prepping some RHEL 5.5 laptops, I noticed something odd. Very odd. I had made some changes to a base system and did an rsync -av -n from the base system to a pristine source installation to see what had … Continue reading →

Posted in Linux, System Administration

Linux Serves Up Apple Time Machine

Posted on December 21, 2011 by lukeJanuary 27, 2013

Upon the most undignified death of our Macbook Pro 2.2, we have since acquired a new Macbook, running Lion. Not surprisingly, my Linux based AFP server needed an update. Code: Netatalk 2.2.1, from http://netatalk.sourceforge.net/. Berkeley DB 4.8.30, from http://www.oracle.com/technetwork/database/berkeleydb/downloads/index-082944.html After … Continue reading →

Posted in Linux, System Administration

BASH and the PS1 Variable

Posted on December 5, 2011 by lukeJuly 10, 2014

What is a shell, and why do I care about its prompt? A shell is nothing more than a program, serving two purposes. One is to interact with human beings. The other is to prep and start other programs. For … Continue reading →

Posted in System Administration

Partition Offsets for Loopback Setup

Posted on August 26, 2011 by lukeFebruary 24, 2013

Every so often, I need to mount a filesystem that exists within a logical volume or sparse file. This means delicately treading around the boot sector, or other partitions. Linux has a nifty command, called losetup, from the util-linux package. … Continue reading →

Posted in System Administration, Virtualization

SSH, PPP, and SLIRP

Posted on June 30, 2011 by lukeSeptember 15, 2013

Let’s face it. Sometimes you have a need for network wide access via SSH. Port redirection does not cut it, and PermitTunnel may be disabled. Here is an old school program that works very well: slirp. Slirp was born in … Continue reading →

Posted in Linux, Scripts and Howtos, System Administration

X Windows and the Dvorak Keyboard

Posted on May 13, 2011 by lukeJanuary 31, 2013

As a system administrator, upon occasion you get a rare request. One of these crossed my desk the other day. A student asked if he could map the US keyboard over to the Dvorak key mappings. My first inclination was … Continue reading →

Posted in System Administration

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