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Since 1994: The Original Magazine of the Linux CommunityAUGUST 2008 | ISSUE 172Billix | Rails | Gumstix | Zenoss | Wiimote | BUG | Quantum GISLINUX J

8 | august 2008 www.linuxjournal.comIf you are a regular visitor to the LinuxJournal.comWeb site, you might recognize me as thegoofy video Gadget Guy,

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Try Puppy LinuxWow, what a great article by LouisIacona [LJ, April 2008, “Puppy Linux”]. I was pleasantly surprised to find it so in depth for a magaz

Keep up the good work. Hopefully I willsend some converts your way soon!--Dean AndersonSonyI’m happy to see the coverage ofSony’s use of Linux in the

16 | august 2008 www.linuxjournal.comUPFRONT NEWS + FUNHaving to rebootproduction systemsto incorporatesecurity patches isa pain. How muchbetter would

www.linuxjournal.com august 2008 | 17[ UPFRONT ]LJ Index, August 20081. Number of new toys the average child gets per year: 702. Size of the “baby i

[ UPFRONT ]A few weeks ago, I was flying westpast Chicago, watching the groundslide by below, when I spotted thesignature figure eight of the FermiNat

[ UPFRONT ]want to get into legal trouble, pleaseconvince me that this is legal.” The A says:What we are doing is gettingthe source rpm of each RedHat

20 | august 2008 www.linuxjournal.com[ UPFRONT ]By 1988, Larry Bird had already wonthe three-point shootout twice. In thelocker room, while waiting to

Geoff Goodell has a PhD in Computer Science from Harvardand is currently researching Internet surveillance and networkneutrality. Recently, I found my

22 | august 2008 www.linuxjournal.comI am writing this article in mid-May 2008, severalweeks after Twitter was rumored to be moving to a platform othe

on your system; on mine, it was put into/usr/lib/ruby/gems/1.8/gem. Next, you need to addthe following to one or more of your environmentconfiguration

If you prefer to have the results sent to youvia e-mail, rather than stored to a disk file, usethe -e option:pl_analyze /var/log/production_log -e ¯

This means there were 608,720 calls toBuffer#read during the test, which took a totalof 38.13 seconds, or 13.75% of the executiontime. Because this is

26 | august 2008 www.linuxjournal.comMon Dieu, François! I realize it’s a warm day outside,but it is positively freezing in here. Our guests willneed

right of the screen, and a pop-up menu appears(Figure 2). Not only can you change the difficulty here,but you also can turn sound effects on or off, c

leader of the Pingus, will find yourself commandinghordes of Pingus who must be directed to safety orcertain death. To do this, you instruct the Pingu

interesting directories are there, includingone for your Halloween adventures.Perhaps the most interesting ones arethe wip (work in progress) director

30 | august 2008 www.linuxjournal.comLast month, we had a lot of fun digging aroundwithin the Internet Movie Database, producing a setof scripts that

So, the line ends up as follows:sed -n ${pickline}pThat does the trick, and in an appli-cation like this, sed is lightning fast too.At this point, we

32 | august 2008 www.linuxjournal.comIf you think about it, there are almost as manyways to interface with your computer as there areDebian-based dist

Wiimote down or up, the mouse will move down orup, respectively, and if you roll the Wiimote to the leftor right, the mouse will move left or right, r

keys to the Nunchuck and Classic Controller attach-ments, so all I had to do for it to work with snes9xwas create a new configuration file that mapped

WHY LPI CERTIFICATION?RELEVANCE• #1 Linux certificationworldwide and growing• Program framework createdfrom industry needs andinput• Professional “Job

36 | august 2008 www.linuxjournal.comNEW PRODUCTSLinux Game Publishing and AscaronEntertainment’s Sacred GoldOur team is truly tickled at how many hig

www.linuxjournal.com august 2008 | 37NEW PRODUCTSPlease send information about releases of Linux-related products to [email protected] or N

CONTENTSAUGUST 2008Issue 172FEATURES2 | august 2008 www.linuxjournal.com48 THE BUG: A LINUX-BASEDHARDWARE MASHUPWith the BUG, you get a GPS, camera, m

Hilbert IIHere’s one for the mind-bending cate-gory. In this age of shared informationand decentralization comes anothercool addition to the realm of

www.linuxjournal.com august 2008 | 39some sort of decent gaming distraction?Well, you have a lot of options, such asadventure text games and moon-bugg

Library. Once you’ve installed those,head to the Tetuhi Web site and grabeither the latest tarball or the latestcode from the GIT repository.Once you

42 | august 2008 www.linuxjournal.comCruising for hotspots on a LinuxLaptop can be a royal pain. It’s notthat we don’t have good Wi-Fi sup-port—we do—

marketplace. The other minor quibblehas to do with the battery light—namely,there isn’t one. In fact, there’s no way toknow how much battery life you

44 | august 2008 www.linuxjournal.comThe Neuros OSD is a very small and energy-efficient boxthat can play digital video, photos and music from several

www.linuxjournal.com august 2008 | 45and a 128MB SD memory card from Dikom. For network-related tests, I connected it to a port of a D-Link 604TADSL m

46 | august 2008 www.linuxjournal.comOnce everything was up and running, I finally started usingthe OSD. I’ve played MP3 files, recorded and played TV

www.linuxjournal.com august 2008 | 47this limitation and interact with the OSD over LAN. Formore information, check out the Neuros Developer Website (

ABERDEENThe Straight Talk PeopleSINCE 1991SMHOW MUCH STORAGEDO YOU NEED?Intel, Intel Logo, Intel Inside, Intel Inside Logo, Pentium, Xeon, and Xeon In

The BUG:a Linux-BasedHardware MashupIt runs Linux, has a GPS, camera, motion detector and color touchscreen—and it’s completely hackable! Mike Diehl48

www.linuxjournal.com august 2008 | 49

I’ve shown my review unit to my wife and every other nerdI know, and the response has been the same each time. Atfirst they don’t know what it is. Aft

site. They tend to be well written and serve as good exampleprograms from which to learn. There is sample code avail-able on the Bug Labs Web site to

52 | august 2008 www.linuxjournal.comA SYSADMIN’S SWISS ARMY KNIFEBillixTurn that spare USB stick into a sysadmin’s dream with Billix. BILL CHILDERSDo

After reading through the DSL Website, I discovered that it was possible torun DSL off of a bootable USB key, andthat old love for the Bootable Busine

working Internet connection with DHCPis required, as the netinstall downloadsthe installation bits for each distributionon the fly from Internet-based

mount a corrupted Windows filesystem,and I was able to save some of the data.DSL is fairly full-featured for its size, andit comes with two window man

56 | august 2008 www.linuxjournal.comFun with E-Ink, X and GumstixHow to get X running on a Gumstix embedded device with an E-Ink display and run all

Figure 1. Firefox Displaying Linux Journalon an E-Ink DisplayE-paper devices have been on the market since around 2006or so. The good news is that Lin

COLUMNS8 SHAWN POWER’S CURRENT_ISSUE.TAR.GZLinux: the Root of All Coolness22 REUVEN M. LERNER’S AT THE FORGEProfiling Rails Applications26 MARCEL GAGN

The new software building block that we’ll add to this sys-tem is something called deferred IO. Deferred IO is a recentlyadded hack in the Linux kerne

# git pull git://git.kernel.org/pub/scm/linux/¯kernel/git/torvalds/linux-2.6.git# cd linux-2.6# cp arch/arm/configs/am200epdkit_defconfig .config# mak

your Gumstix’s root filesystem. At this point, Xfbdev finallyis on the system. We’re almost at the finish line. On yourGumstix console, load the drive

62 | august 2008 www.linuxjournal.comOne Box.SIXTEEN TRILLIONBYTES.Build your own 16-Terabyte file serverwith hardware RAID. Eric PearceI recently had

Project GoalsI wanted to consolidate several Linux file servers that I use fordisk-to-disk backups. These were all in the 3–4TB range andwere constant

cooling shroud to fit around the motherboard power cables.The process of assembling the motherboard, CPU, heat sink,disks and memory was conventional,

cable was labeled with the first port at 0 (and ending at 3),and the other three had the first port at 1 (and ending at 4),while the backplane ports w

experience involves Red Hat’s Linux Enterprise distribution, butI had trouble finding information on adding XFS support. Ispecifically wanted to avoid

4) RAID card settings: Native Command Queuing (NCQ)is supposed to offer better performance by letting the driveelectronics reorder commands for optimi

68 | august 2008 www.linuxjournal.comFive years ago, I made one of thegreatest life-changing decisions in mycareer—I switched my organization tothe GN

www.linuxjournal.com august 2008 | 69Speed Gives LifeNow, pay close attention, not only hasLinux dramatically increased in usabilityand features durin

70 | august 2008 www.linuxjournal.comThe Real CustomersNow, let’s talk about the users of ourLinux desktops. I’m a teacher as well, soI have to use Li

www.linuxjournal.com august 2008 | 71to those who do.Something I find as irritating asthe giant Maine mosquito is the useof proprietary protocols, sta

If a tree falls in the woods and no one is there to hear it,does it make a sound? This the classic query designed to placeyour mind into the Zen-like

www.linuxjournal.com august 2008 | 73another, they must have matching community names/strings.In many deployments, administrators use the default comm

74 | august 2008 www.linuxjournal.comlist and selecting Manage→Change Class.If all has gone well, so far we have a functional SNMPmonitoring system th

Register for the low-cost conference and free Show badge:Show Hours: 8 - 4:00 pmConference Hours: 9 - 4:50 pmShow Management:Flagg Management Inc353 L

76 | august 2008 www.linuxjournal.comINDEPTHno schedule is specified (the default), the rule runs all the time.In our rule, only one user will be noti

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Executive EditorAssociate EditorSenior EditorArt DirectorProducts EditorEditor EmeritusTechnical EditorSenior ColumnistChef FrançaisSecurity EditorPro

78 | august 2008 www.linuxjournal.comtype the letters. Select TCP as the protocol, and click OK.Click Save on the resulting page. As with the OSProces

A flying saucer descends onto an open field and lands,kicking up dust all around it. If this happened in a remakeof The Day the Earth Stood Still nobo

2-D motion tracking is the technology used in composi-tors to affix a new element to a specific point in the frame.A user generally will select one or

82 | august 2008 www.linuxjournal.comdata—camera settings and movement, as well as the“point cloud”—to various 3-D programs, and it is in the 3-D prog

HTTP Server ActiveMQ AntAPR Archiva Beehive CayenneCocoon Commons ContinuumCXF DB Directory ExcaliburFelix Forrest Geronimo GumpHadoop Harmony HiveMin

84 | august 2008 www.linuxjournal.comINDEPTHparticularly the motion path of the different points. If youcan’t see any drift, you’re golden—you can ski

OCTOBER 27-30, 2008| HYNES CONVENTION CENTER | BOSTON, MARegister today at www.sdbestpractices.comPlus:::Expo::Case Studies::Birds-of-a-Feathers::Roun

If you’ve ever zoomed around theglobe with Google Earth, you knowhow much fun it can be to work withgeospatial data. When I need a diver-sion, I often

www.linuxjournal.com august 2008 | 87is add the requisite repository to yourfavorite package manager. If you mustinstall from source, there are plenty

88 | august 2008 www.linuxjournal.comVector-Based Data Formatsin GISAs you splash around in the world ofGIS, you also will encounter a plethoraof vect

(the name says it all) andWashtenaw_nlcd_1992.shp (land use).Making Things Look RightUnfortunately, upon loading theshapefiles, the sum total map that

Map View more useful, such as making the colors of the other layersmore intuitive (for example, bluelakes) and thickening the lines desig-nating the r

right next door on the toolbar, theCapture Point tool, is activated, and Ican create points anywhere I choose.I create a point for each potentialbuild

At my wedding, I received an important piece of advicefrom a couple whose wedding we had attended a coupleyears earlier: get a second TV. The idea is

www.linuxjournal.com august 2008 | 93doing this unless you’re familiar with XFS. I’ve had some issueswith it—for example, it tends to become unmounted

94 | august 2008 www.linuxjournal.comindicate where you want to store recordings. The latest versionof MythTV allows you to specify multiple directori

consider upgrading if necessary. Another problem I experiencedearly on was that playing recordings or DVDs consumed such alarge fraction of CPU time (

Why chase the iPhone, when we can free the worldwith open mobile things?DOC SEARLSI’ve been writing, one way or another, forLinux Journal since 1996.

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