May 2013 Issue of Linux Journal: Raspberry Pi

A Pint-Size Powerhouse with a Tasty-Sounding Name

It's hard not to love the Raspberry Pi. For less money that it takes to stop at a drive-through, it's possible to buy the top-end RPi model. (Granted, I have three teenagers, so the drive-through is expensive.) The Raspberry Pi is as open as the manufacturer can make it, has huge community support, and its software isn't backed by a huge corporation with mysterious motivations (cough, Android, cough). It's just a cool little ARM device that runs Linux. This month, we focus on the Raspberry Pi. The drive-through is optional.

Dave Taylor doesn't work directly with a Raspberry Pi this month, but his continuing series on scripting a Cribbage game certainly will work on an RPi. Even if you're not a Cribbage fan, Dave's scripting lessons are infinitely useful for learning. Reuven M. Lerner teaches a thing or two this month as well—specifically in regard to running background tasks in your Web applications. Running things in the background can make a monstrous Web application perform much more quickly from the end user's perspective. Reuven shows how with Sidekiq.

Kyle Rankin, who first interested me in Raspberry Pi devices, talks about redundancy this month. What's better than a Raspberry Pi? Redundant pies—or Pis, rather. If you want to bolster your RPi reliability or just want an inexpensive platform to learn clustering, Kyle walks through the process. I've been writing about my Raspberry Pi adventures off and on for the past six months, so this month, I decided to focus on an issue that is near and dear to my heart: RSS. If the Google Reader shutdown in July has you worried about how you'll browse the Web, perhaps my column will help. I'm past panic mode, and I've been able to wean myself off Google Reader altogether.

I'm probably not the only Linux Journal reader who has a full virtualization system with iSCSI SAN/NAS storage in my basement. Unfortunately, along with that nerdy power comes a big electricity bill. Brian Trapp describes the other end of that spectrum with his article on creating the perfect home server—with a Raspberry Pi. There are plenty of reasons powering your Linux server infrastructure with a cell-phone charger is awesome, and Brian explains how. If you want to add IPv6 to the mix, Igor Partola follows up with an article on creating an IPv6 router on your network, even if your ISP doesn't support it!

I realize all my "servers in the basement" stuff is almost cliché when talking about Linux users. To be fair, I didn't say it was my mom's basement. Still, Jonathan Brogdon's article on controlling stage lighting with a Raspberry Pi is a great way to avoid our basement-dwelling stereotype. Jonathan literally puts RPi in the spotlight with his hardware/software combination for controlling external lighting. It's a real-world solution and really cool to read about.

The coming shutdown of Google Reader has made all of us think a little harder about the dangers of cloud computing. At the very least, it's forced us to think about trusting cloud-based services we don't directly control. Diana Marina Cooper talks about the other end of the cloud—specifically as it relates to open-source compliance. How does the GPL relate to a world of "Software as a Service"? If the cloud obfuscates the software and the code, what does that mean with regards to FOSS? Diana takes a serious look at a problem not many of us consider.

Do you have a Raspberry Pi, and are you looking for something to do with it? Do you already have a rack of clustered-RPi devices in your basement, and are you looking for tips on optimization? Regardless of your immersion level into the Pi, this issue should prove useful and entertaining. Even if you have no interest in the Raspberry Pi, this issue is full of the same tech tips and Linux news you're used to seeing. This issue was incredibly fun to put together, and we hope you enjoy it as much as we did.

Available to Subscribers: May 1

______________________

Shawn Powers is an Associate Editor for Linux Journal. You might find him chatting on the IRC channel, or Twitter

Comments

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

I haven't quite got as far as

Pyplate's picture

I haven't quite got as far as building a cluster, but I've built a server with my Pi. It's on line at http://raspberrywebserver.com. I've figured out how to build a load balancer, so hopefully I'll have a Pi cluster running soon.

I love Linux and I use

siblek31's picture

I love Linux and I use Linux

regards cara cepat hamil belajar bahasa inggris

I love Linux and I use

siblek31's picture

I love Linux and I use Linux

regards tips cepat hamil belajar bahasa inggris

Oakley Replica Sunglasses,Oakleys Store,Oakley C SIX

podcfzu8's picture

No one believes you, no one wants to listen to you? But I believe that everything can be perfected, it requires imagination.Oakley sunglasses to create a new trend in the fashion industry. Position in the field of fashion has never wavered, but also created a number of exciting products, the times.Sunglasses can eliminate specific frequencies of light. Certain frequencies of light can blur the line of sight, and some other frequencies of light can enhance the contrast. Sunglasses to choose the correct color to make it get better results in certain circumstances.Oakley sunglasses are a variety of protective glasses have a tendency to Klose or protection to be taken to prevent the particles, water or chemicals punching face.When you wear the Oakley sunglasses, you do not feel weak, you can see more clearly the object, do not forget, good Oakley Sunglasses supporting the mirror box, lens cloth, tag.If you wear sunglasses, others can very clearly see your eyes, then your lens color is too light.Yellow lenses filter blue light, nature scenery can be seen more clearly. While driving, wearing a yellow lens sunglasses, you can more clearly see from the vehicle.The fine texture of the lens in the light-transmissive protection rate, but also to filter out more than 90% of the sun's ultraviolet rays, so that the lens should be affixed with a "UV-100PROTCT10N" pins.Quality sunglasses not only can not block ultraviolet rays, but also a serious decline in the lens transmittance pupil larger, the ultraviolet but will a substantial injection, and eye damage. In addition, poor quality lenses also make the nausea, forgetfulness, insomnia and other symptoms of visual fatigue.With sunglasses in his hand corners facing the fluorescent light, so that the reflective mirror smooth scrolling, mirror reflection of the fluorescent film appears wavy, distorted shape to prove that the lens is not flat, so that the mirror can damage eyesight.Oakley sunglasses with more than $ 40 XYZ optical lens has a depth of contact elements and photovoltaic ultraviolet radiation happy ending.Polarized lenses have a special filter material, the reflected light filtered water, wet or the sun shining road and wet sand.Absorption sunglasses lens material with certain metal oxides, such lenses can selectively filter out harmful light.Oakley technology, including high-definition optical Plutonite lenses filter out 100% of UV rays, UVA, UVB and harmful blue light to 100nm and optimized corner.Oakley sunglasses financial science and art perfect in one, breaking the limitations of traditional philosophy, the re-definition of the product category.Oakley sunglasses, the international high-end brands are significantly more affordable, high price compared with the price, this is the sunglasses on the market is a great advantage is the way forward.Designers and professional sunglasses, such as various sports activities, more expensive sunglasses than the vast majority of employment. However, you will find a variety of on-line at an affordable price in the market of fashion sunglasses.This will be a good choice. Holbrooke Oakley sunglasses produce a variety of photo frame. This allows the wearer's temples, in order to adapt to different sizes and shapes, so comfortable.Many women because the vast majority of you will no doubt such as texture and stylish glasses and the fact of concern. One is the absolute latest accessories direction is an excellent dietary supplement.Oakley sunglasses is the best. They are probably the planet's most stylish and chic, Oakley sunglasses series is definitely a very stylish and fashionable. This is a real acquisition.

I am happy to find your

juliaware's picture

I am happy to find your distinguished way of writing the post. Now you make it easy for me to understand and implement the concept. Thank you for the post. Spring Manufacturers Compression Springs Torsion Spring Helical Springs Spring Manufacturers in India

This is really interesting,

juliaware's picture

This is really interesting, You’re a very skilled blogger. I have joined your rss feed and look forward to seeking more of your fantastic post. Also, I have shared your web site in my social networks! Custom Peptide Synthesis GMP Peptides Cosmetic Peptides Peptides

Thanks for posting this info.

juliaware's picture

Thanks for posting this info. I just want to let you know that I just check out your site and I find it very interesting and informative. I can't wait to read lots of your posts. SS Fabricator Stainless Steel Fabricator Aluminium Fabricator Aluminium Fabrication

I really like the way you

juliaware's picture

I really like the way you start and conclude your thoughts. Thank you so much for this information. keep posting such good stuff.
Aluminium ladder FRP Ladder

Visiting this blog is our

juliaware's picture

Visiting this blog is our real pleasure. Should like to thank admin for sharing such a useful information and starting this thread in addition to that we suggest traders not to panic when market is in profit booking state. Web Design Company | Website Design Company

A tip for installing the boot image for the Raspberry Pi

Nathan Stenzel's picture

It is important to note that when you install the boot image on your SD card that you install the image to the drive and not a partition. If it would be /dev/sdb or whatever. Don't try to install it to /dev/sdb1 or /dev/sdb2 or whatever. It will make the partition table on the SD card which was probably using a DOS format partition table before you started. I figured I would mention that because I installed it to the wrong place on my first try and so did my friend who just recently got one.

Raspberry Pi: the Perfect Home Server

Nathan Stenzel's picture

On page 69 under the heading "Arranging the Hardware", you mention "It's possible to use a USB thumbdrive for booting, but that would use up one of the two precious USB slots" but last time I checked, they can only boot from the SD card which must be a standard SD card (not an adapter for a micro SD card). Your magazine has a poll (which I found on pages 22 and 23) asking which features to add and one of the features is the idea of adding USB booting options to it.

Booting from USB

Jez's picture

It is indeed possible to boot from a thumb drive, but the process has to be started from an SD card.

You can use a microSD in an adapter, but you have to be careful which card you try, not all work. There is a list of hardware at elinux.org/RPi_VerifiedPeripherals that are known to work. (I use an 8gb SanDisk microSD)

Either way, the SD card needs to contain at least the syslinux partion that loads the main system. The thumb drive would contain everything else, and both would be needed to boot the system. Certain brands of thumbdrives up to 64Gb are known to work and would support this kind of boot.

It is highly unlikely that RPi would ever boot directly from USB. This is because the graphics processor is used to bootstrap the core, and the core contains code for the ARM processor to drive the USB. The graphics processor has no need to ever talk to the USB, and therefore cannot boot from it without modification...
Booting syslinux from a small SD and then switching to a large fast thumbdrive containing everything else is a reasonable compromise.

Hope this helps.

Reply to comment | Linux Journal

Remove Duplicate Files's picture

It's a shame you don't have a donate button! I'd definitely donate to this excellent blog! I guess for now i'll settle for bookmarking and adding your RSS feed to my
Google account. I look forward to fresh updates and will talk
about this website with my Facebook group. Chat soon!

Reply to comment | Linux Journal

dailysms's picture

Thanks for finally writing about > Reply to comment | Linux
Journal < Liked it!

Congratz

PuTTy's picture

Many thanks to Shawn Powers and his article about the comparison between RSS clients. So far I was using Feedly but was pissed off from the icon that always staying on my right bottom part of the screen and after reading the news on your magazine that feedly is going to offer and paid service that made me to switch on Leafrea, but before that few weeks ago I deployed an TinyRSS server on Debian 6 cli with SSL encryption even uploaded that video on my Youtube channel - from creation of the server to adding ssl encryption , but sadly tinyrss doesn't update the rss news so often as Leafrea. Thanks for mentioning that program and saving me resources from using a seperate server for just reading my rss feeds.

Congrats

PuTTy's picture

Many thanks to Shawn Powers and his article about the comparison between RSS clients. So far I was using Feedly but was pissed off from the icon that always staying on my right bottom part of the screen and after reading the news on your magazine that feedly is going to offer and paid service that made me to switch on Leafrea, but before that few weeks ago I deployed an TinyRSS server on Debian 6 cli with SSL encryption even uploaded that video on my Youtube channel - from creation of the server to adding ssl encryption , but sadly tinyrss doesn't update the rss news so often as Leafrea. Thanks for mentioning that program and saving me resources from using a seperate server for just reading my rss feeds.

Download links don't work - again this month.

Bob Gustafson's picture

Yet again, another month.

And again, the links in your reminder email don't work. I get 403 errors on button clicks.

One would think that a Geek magazine like Linux Journal would get its download system sorted out by now.

For me, the "here" link in

Nathan Stenzel's picture

For me, the "here" link in the email about the new issues works. I am not sure if that is the one you are talking about or not.

https://www.pubservice.com/SubInfo.aspx?PC=LJ&do=D (the Issue Download Login page) gives the following error though:

"You don't have permission to access /pdf/dljdownload.php on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request."

I must agree that it is surprising that a geek mag would have such errors.

Webinar
One Click, Universal Protection: Implementing Centralized Security Policies on Linux Systems

As Linux continues to play an ever increasing role in corporate data centers and institutions, ensuring the integrity and protection of these systems must be a priority. With 60% of the world's websites and an increasing share of organization's mission-critical workloads running on Linux, failing to stop malware and other advanced threats on Linux can increasingly impact an organization's reputation and bottom line.

Learn More

Sponsored by Bit9

Webinar
Linux Backup and Recovery Webinar

Most companies incorporate backup procedures for critical data, which can be restored quickly if a loss occurs. However, fewer companies are prepared for catastrophic system failures, in which they lose all data, the entire operating system, applications, settings, patches and more, reducing their system(s) to “bare metal.” After all, before data can be restored to a system, there must be a system to restore it to.

In this one hour webinar, learn how to enhance your existing backup strategies for better disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible bare-metal recovery solution for UNIX and Linux systems.

Learn More

Sponsored by Storix