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Linux

Traffic shaping and bandwidth management

Post date: April 17, 2005, 10:04 Category: Network Views: 4324 Comments
Tutorial quote: This article is from the perspective of a small network, possibly a couple of people sharing one connection. It will explain traffic shaping and bandwidth management in general and with linx. It (sort of) walks through building a traffic shaping router.
Linux

Tuneups and Tweaks for the Better Spam-Trap

Post date: April 14, 2005, 13:04 Category: Network Views: 2576 Comments
Tutorial quote: In parts 1 and 2 of our thrilling "Building an Anti-Virus/Anti-Spam Gateway" series, we covered the basic steps for setting up SpamAssassin and Clam Anti-virus with Postfix. This installment is devoted to testing and tweaking, and creating whitelists in Amavisd-new. Whitelists are essential when you set up any kind of spam filtering: It's the best way to make sure your wanted mail gets through.
Ubuntu

How to Upgrade to Alsa 1.0.20 on Ubuntu Jaunty 9.04

Post date: August 14, 2009, 18:08 Category: Installing Views: 1652 Comments
Tutorial quote: Advanced Linux Sound Architecture (known by the acronym ALSA) is a Linux kernel component intended to replace the original Open Sound System (OSS) for providing device drivers for sound cards. If you are experiencing sound issues on Ubuntu Jaunty 9.04 or just want the latest version, you may want to upgrade to ALSA 1.0.20 (Ubuntu Jaunty comes with Alsa version 1.0.18rc3 - you can check this by typing this in a terminal: cat /proc/asound/version). Read on!
SuSe

Adobe Flash Player 10 installation on OpenSuSe

Post date: November 16, 2008, 06:11 Category: Installing Views: 5388 Comments
Tutorial quote: With Flash Player 10, Adobe is focusing on building "expressive" applications for the Web, said Tom Barclay, Adobe senior product marketing manager for Flash Player. Applications can be deployed including online video, rich Internet applications, online games, and other interactive experiences.
Linux

The Linux /proc Filesystem as a Programmers' Tool

Post date: June 22, 2005, 09:06 Category: Programming Views: 3367 Comments
Tutorial quote: My entry into systems programming was guided by my desire to understand further the operating systems I was working with daily as a contract UNIX and, later, Linux system administrator. The result of this was ifchk, a packet sniffer detector I wrote in C and released in June of 2003. ifchk initially was written under IRIX and then ported to Linux, mostly under the 2.4 kernel. The current ifchk revision, beta 4, recently was released and beta 5 is on the way.

My work on ifchk has allowed me to examine programmatically several areas of operating system functionality. Examples include the Linux netlink(7) and rtnetlink(7) facilities, device control--that is, network interfaces--via ioctl(2), signals and proc, the process filesystem. Proc and its ability to display a wide array of data concerning the runtime state of a system are the focus of our discussion here.
Debian

dmcrypt

Post date: January 25, 2006, 22:01 Category: Security Views: 4305 Comments
Tutorial quote: Device-mapper is a new infrastructure in the Linux 2.6 kernel that provides a generic way to create virtual layers of block devices that can do different things on top of real block devices like striping, concatenation, mirroring, snapshotting, etc... The device-mapper is used by the LVM2 and EVMS 2.x tools. dm-crypt is such a device-mapper target that provides transparent encryption of block devices using the new Linux 2.6 cryptoapi. Writes to this device will be encrypted and reads decrypted. You can mount your filesystem on it as usual. But without the key you can't access your data. It does basically the same as cryptoloop only that it's a much cleaner code and better suits the need of a block device and has a more flexible configuration interface. The on-disk format is also compatible.
Linux

SpamAssassin and Amavisd

Post date: April 14, 2005, 13:04 Category: Network Views: 2657 Comments
Tutorial quote: The bad news is, it's SpamAssassin, not SpammerAssassin. The good news is it kills spam quite effectively, and fits nicely into an anti-spam, anti-virus gateway. This article, which shows how to use SpamAssassin with Postfix, is the first in a series on building an anti-spam and anti-virus gateway. This gateway works equally well for a single PC, or for a large network.
Unix+clones

Using network transfer protocols

Post date: April 15, 2005, 18:04 Category: Network Views: 2155 Comments
Tutorial quote: Let's face it, most of us are in a rut when it comes to moving our files around. We learned how to use a simple FTP client years ago, and maybe even updated to a GUI FTP client when we were feeling particularly adventurous. There are actually a wealth of tools available for transferring files, and some of them perform automation functions that can easily assist your business in building site mirrors, synchronizing directory contents, and more.

Keep in mind that for many of the tools covered here, there's only really room to skim through their features. Some, such as wget and rsync, are full of useful capabilities for those brave enough to read their man pages and experiment.
Linux

Building a Linux video jukebox for an anime convention

Post date: November 25, 2005, 21:11 Category: Miscellaneous Views: 3036 Comments
Tutorial quote: I wrote this little whitepaper a while back for Amy Zunk to document the function of the VideoKeg/VideoJukebox boxes. Documented here for posterity. The primary goal of the video keg was to build a reliable video box that was easy to transport with enough space to store 3 days worth of Anime fan-subs.

The secondary goal of the video keg was to make a home PVR system for video playback and time-shifting, along with a video arcade and perhaps a web browser. The tertiary goal of the video keg was to find an affordable hardware platform so that we could buy 4 of them immmediately to service the primary goal's need for 4 separate video rooms.

For a PVR, the machine neeed to be small, quiet, low-heat, and still fast enough to run the software video player and arcade games. For portability, we decided to go with a smaller mini-ITX style cube box.
OpenSUSE

Measuring the performance/latency of OpenSuse system - LatencyTOP

Post date: February 17, 2009, 08:02 Category: Optimizing Views: 4811 Comments
Tutorial quote: Skipping audio, slower servers, everyone knows the symptoms of latency. But to know what's going on in the system, what's causing the latency, how to fix it... that's a hard question without good answers right now.

LatencyTOP is a Linux* tool for software developers (both kernel and userspace), aimed at identifying where in the system latency is happening, and what kind of operation/action is causing the latency to happen so that the code can be changed to avoid the worst latency hiccups.
Web-based applications and online marketing solutions - LumoLink