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This article explains how you can set up a caching reverse proxy with Squid 2.6 in front of your web server on Debian Etch. If you have a high-traffic dynamic web site that generates lots of database queries on each request, you can decrease the server load dramatically by caching your content for a few minutes or more (that depends on how often you update your content).

Is success measured in downloads, or up-loads? are bugs filed as good as bugs fixed? are volunteer marketers as valuable as volunteer developers? If we have lots of bugs filed and lots of volunteer management material is that success? is the pace of change important? Does successful QA exist to create process to slow and reject changes, or by accelerating inclusion of fixes improve quality? Is success having complete, up-to-date and detailed specifications for every feature? Is success getting everyone to slavishly obey laborious multi-step processes, before every commit? Alternatively does success come through attracting and empowering developers, who have such fun writing the code that they volunteer their life, allegiance and dreams to improve it?

The Linux kernel does not lack for low-level memory managers. The venerable slab allocator has been the engine behind functions like kmalloc() and kmem_cache_alloc() for many years. More recently, SLOB was added as a pared-down allocator suitable for systems which do not have a whole lot of memory to manage in the first place. Even more recently, SLUB went in as a proposed replacement for slab which, while being designed with very large systems in mind, was meant to be applicable to smaller systems as well. The consensus for the last year or so has been that at least one of these allocators is surplus to requirements and should go. Typically, slab is seen as the odd allocator out, but nagging doubts about SLUB (and some performance regressions in specific situations) have kept slab in the game.

Open Source Software is about more than just the Linux operating system, and 2008 brought advances in the form of OpenOffice.org, IBM Lotus Symphony, Firefox and Android. But Linux is still the heart of the FOSS movement, and this year brought key developments in the operating system as well. Here's a look at the coolest open source products to come across the transom in 2008.

MySQL, the lovable little database engine that could - for reasonable values of could - is starting to feel the pain of being an open source project distributed by a large company. With a slower release cycle, community contributions are having a hard time making it into the mainline codebase, and an illicit market for patches and forks is emerging.

KDE 4 saw the introduction of NEPOMUK, the foundations for the "Social Semantic Desktop". The idea behind Semantic desktops is to make it possible for computers to identify meaningful relations between files and real-world people and relationships. These relations can then be exploited to help the user find their data.

There are several Web sites which seek to bring out the truth other than ourselves. There are other domains like slated.org, edge-op.org and even this Russian site, gotthefacts.org, which all expose the same type of illegal Microsoft tactics. Most of them just provide Web hosting (mirrors) for the evidence stamped by a United States court.

Creative Commons is becoming a web force to be reckoned with. I recently switched to a Firefox browser from Internet Explorer (a revelation in many ways, but that’s another article) and didn’t even have to modify my toolbar to create a Creative Commons search shortcut. CC is one of the default directories; it was already there, alongside big names Yahoo, Google, Amazon, Answers.com, eBay and Wikipedia. The site is growing in leaps and bounds. As the tentacles of the Creative Commons organization lengthen and curl, and its presence is felt in every corner of the web (who hasn’t read a plethora of blogs with the disclaimer ‘licensed under a Creative Commons 3.0 by-nd license’, or some such) it’s time to explore how online users can get the most out of this newfangled intellectual copyright phenomenon.

Easy does it GPS applications on the Nokia N810 Internet Tablet. Learn how to configure a development environment targeted at the Nokia N810 Internet Tablet, including setting up Eclipse on a target development machine for the Python language.

We have just had the 40th anniversary of Doug Engelbart's Mother of All Demos, the day when Doug showed the mouse that everybody knows about in public for the first time as part of the oN-Line System (NLS). It is not so widely known how much more Doug demonstrated that day. He started out with windows, graphics, structured text editing, hypertext, video chat, and much more that became the foundation of all Graphical User Interfaces by way of Alan Kay's Smalltalk at Xerox, and the Apple Lisa and Macintosh.

The white paper definition describes crowdsourcing as a "neologism for the act of taking a task traditionally performed by an employee or contractor, and outsourcing it to an undefined, generally large group of people, in the form of an open call." Jeff Howe, a contributing editor at Wired Magazine, gives a much better definition and describes crowdsourcing as "the application of Open Source principles applied to fields outside of software." I've been bringing the concept up in more conversations because I've come to believe that it's a very powerful, useful, and cost efficient model that entrepreneurs should know about. However, no matter who I talk to, whether it be a successful businessman or founder of a new tech company, I've had to repeatedly explain what it is. If it isn't already, I predict that crowdsourcing will be one of the new, hot buzzwords in 2009. (We certainly need more, the term "Web 2.0" is beginning to make me puke.)

Linux Mint version 6 Felicia came out on December 15th and I have been running it on my Dell Inspiron 530 Q6600 system for the past week. I ran Hardinfo on the system if you want to see the specifications on the box. It is a quad core with 6 GB of RAM, so I was a little disappointed that the 64 bit version of Linux Mint was not released the same day the 32 bit version came out. Even though they have a 64 bit version of Linux Mint 5 Elyssa available I wanted to try out the latest version. Mint 6 is based on Ubuntu 8.10 Intrepid Ibex and uses GNOME for it’s desktop environment. For those who prefer a different desktop, community editions of Mint 6 featuring KDE, XFCE and Fluxbox should be out soon.

Journalists are often the bearers of bad news; it simply comes with the territory. And with the economy in the tank, there's no shortage of ugly stories to cover. So I'm always pleased when there's a legitimate bit of good news to write about. And counterintuitively enough, three of my columns this year contained good news about employment for techies, despite the downturn.

You can never be too safe these days. Viruses, spyware, rootkits, remote exploits, you just never know what security issue is going to be your downfall. That’s why it is important as a Linux administrator to have an understanding of some of the best Linux security tools available to you. In this article, you will learn about Top Ten Linux security tools, and resources on how to use them to your advantage.

To get a glimpse of the changing face of open source, look no further than InfoWorld's "Future of Open Source" roundtable. Some of the thoughts expressed by various leaders in the open-source community are insightful, but that's not the real story.

The VAR Guy covers the open source industry closely, but his views on a range of items -- including Google Android and Ubuntu Server Edition -- missed the mark badly in 2008. Time for him to apologize for these five pathetic open source predictions that didn't come true in 2008.

Entrepreneur Dave Rosenberg has a Christmas wish for you. Dave wants to make everyone pay for open source in 2009. Money is the fuel that keeps things going. Entrepreneurs are in business to make money. It is reasonable for entrepreneurs to dream of getting more money out of people. But Dave is missing an essential point. In an open source world, business models must be voluntary.

Shell programming is heavily dependent on string processing. The term string is used generically to refer to any sequence of characters; typical examples of strings might be a line of input or a single argument to a command. Users enter responses to prompts, file names are generated, and commands produce output. Recurring throughout this is the need to determine whether a given string conforms to a given pattern; this process is called pattern matching. The shell has a fair amount of built-in pattern matching functionality.

Today, December 26, is the first day of LinuXmas, the Festival of Distros. This three day, three night uber fest of booting new Linux distributions is a new tradition for geeky boys and girls around the world. Here's how it works

One of the biggest misconceptions in software is that open source equals free. The early commercial open-source vendors like MySQL and JBoss were able to build decent businesses on top of a license/support-only business model, but over time we've seen that approach become difficult to grow beyond a certain threshold. I suspect that in 2009 it will start becoming clearer as to what you pay for and why you should. Redmonk analyst Michael Cote made the prediction that next year "it will be cool to pay for software" and I agree. It's one thing to consume open-source software and quite another to pay for it.