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Image Manipulation with ImageMagick

LinuxJournal - Thu, 2014, Apr17 - 10:46

I've spent a lot of time in my column talking about text processing and analysis, with the basic assumption that if you're using the command line, you're focused on text. more>>

Non-Linux FOSS: Angry IP

LinuxJournal - Wed, 2014, Apr16 - 14:12

The de facto standard for port scanning always has been the venerable Nmap program. The command-line tool is indeed very powerful, but I've only ever seen it work with Linux, and every time I use it, I need to read the man page to figure out the command flags. more>>

Installing and configuring owncloud

AZ Loco - Tue, 2014, Apr15 - 20:18

Todd and I spent a morning installing and configuring owncloud on the team server. Things worked fairly well - with essentially only one glitch that I'll discuss at the end.

owncloud was installed on a new virtual machine with Ubuntu server 12.04.3 as the initial install. Immediately after the install from an ISO image, the server was updated with the latest updates.

A web search suggested that there are only install packages for OpenSuse. Later on (more by accident) we found out that Ubuntu has an owncloud package, but we didn't use that.

The instructions we followed were these:
We did put the whole owncloud content directly into /var/www. That worked for us, because the server is dedicated to the owncloud service.

Also - make sure that ssl is running.

At that point we were able to get to the opencloud server from within the local network via Firefox.

Getting to the opencloud from the Internet was done by re-directing port 8081 from to the firewall behind which all AzLoco servers sit. The firewall then does forward the request to the https port of the owncloud server.

The main glitch that needed a bit of sleuthing was this:
When going into the admin of the owncloud server (through the web interface), there was a message that WebDAV was misconfigured. In the end it turns out that owncloud uses CURL to test if the WebDAV works. CURL gets tripped-up on the fact that the certificate being used by apache used a fully qualified domain name that was different than what was in the web request URL. Once the certificate was re-created with the fully qualified domain name matching the host in the request URL, webDAV worked fine.

We didn't attempt to get CA endorsed certificates, because the intent of this owncloud use is for team members, so overriding the certificate trust on the browser is acceptable.

Tags: Arizona TeamArizona Team Projects
Categories: Sponsor News Feeds

Encrypting Your Cat Photos

LinuxJournal - Tue, 2014, Apr15 - 12:28

The truth is, I really don't have anything on my hard drive that I would be upset over someone seeing. I have some cat photos. I have a few text files with ideas for future books and/or short stories, and a couple half-written starts to NaNoWriMo novels. It would be easy to say that there's no point encrypting my hard drive, because I have nothing to hide. more>>

Heartbleed for the desktop

PLUG Chairman Blog - Mon, 2014, Apr14 - 03:03

Heartbleed is a recently discovered security flaw that affects millions of web servers.

Heartbleed affects enough servers that you should just change all your web site passwords. It allows theft of the server's security key, your credentials, your session with the web site and cookies that can be used to impersonate you.

Because the security certificates could be stolen, there are some extra steps.

read more

Categories: Sponsor News Feeds

Heartbleed for the desktop

LuftHans - Mon, 2014, Apr14 - 03:03

Heartbleed is a recently discovered security flaw that affects millions of web servers.

Heartbleed affects enough servers that you should just change all your web site passwords. It allows theft of the server's security key, your credentials, your session with the web site and cookies that can be used to impersonate you.

Because the security certificates could be stolen, there are some extra steps.

read more

Numerical Python

LinuxJournal - Fri, 2014, Apr11 - 11:25

For the past few months, I've been covering different software packages for scientific computations. For my next several articles, I'm going to be focusing on using Python to come up with your own algorithms for your scientific problems. more>>

Speed Test for Nerds

LinuxJournal - Thu, 2014, Apr10 - 12:46

Most people with Internet access in their houses have visited a speed-test Web site to make sure they're getting somewhere close to the speed they're overpaying for. I'm paying more than $100 a month for my business-class connection from Charter, so on a regular basis, I make sure I'm getting the advertised speed. more>>

DNSSEC Part II: the Implementation

LinuxJournal - Tue, 2014, Apr08 - 14:11

This article is the second in a series on DNSSEC. In the first one, I gave a general overview of DNSSEC concepts to lay the foundation for this article, which discusses how to enable DNSSEC for a zone using BIND. more>>

Pro Video Editing with Pitivi

LinuxJournal - Mon, 2014, Apr07 - 11:00

Several decent video editors are available on the Linux platform. Kdenlive, OpenShot, Cinelerra and Pitivi are those that come to mind as "big players" in an admittedly small market. I've used them all through the years, with varying levels of success. more>>

Android Candy: Control-Z for Your Phone!

LinuxJournal - Thu, 2014, Apr03 - 09:52

I never have a Twitter app crash in the middle of a Tweet. That wouldn't be too terrible to deal with. No, for me, it seems my e-mail application decides to crash after I've spent 20 minutes thumbing out a reply while sitting in a crowded airport. If you've ever lost a love letter, term paper, shopping list or world-class Facebook post, Type Machine is the perfect app for you. more>>

Opening Minds to the Spheres Among Us

LinuxJournal - Wed, 2014, Apr02 - 10:07

Linux can't be understood in terms of hierarchy. Neither can the Internet. That's because both are examples of heterarchy at work.

Flatland, an 1880 novella by Edwin A. Abbott, is about a world with just two dimensions, inhabited by lines and polygons. Trouble starts when a sphere shows up. more>>

April 2014 Issue of Linux Journal: High Performance Computing

LinuxJournal - Tue, 2014, Apr01 - 13:33
Big Block Linux with a Four-Barrel Hemi

We often brag about how few resources Linux needs to operate: a Raspberry Pi or Beagle Board, in a Web browser ( more>>

More Secure SSH Connections

LinuxJournal - Mon, 2014, Mar31 - 12:45

If you need remote access to a machine, you'll probably use SSH, and for a good reason. The secure shell protocol uses modern cryptography methods to provide privacy and confidentiality, even over an unsecured, unsafe network, such as the Internet. more>>

Split Testing

LinuxJournal - Thu, 2014, Mar27 - 13:55

It's nice to have many people visit your Web site. It's even better when people don't just come to your site, but also enjoy your content. But, best of all is when visitors to your site do what you would like them to do—sign up for your newsletter, register for your SaaS application or buy one of your products. more>>

LVM, Demystified

LinuxJournal - Wed, 2014, Mar26 - 11:30

I've been a sysadmin for a long time, and part of being a sysadmin is doing more than is humanly possible. Sometimes that means writing wicked cool scripts, sometimes it means working late, and sometimes it means learning to say no. Unfortunately, it also sometimes means cutting corners. I confess, I've been "that guy" more than once. A good example is SELinux. more>>

Encrypted Backup Solution "Home Paranoia Edition"

LinuxJournal - Mon, 2014, Mar24 - 10:23

How to safeguard your personal data with TrueCrypt and SpiderOak. more>>

A Shining Ruby in Production Environments

LinuxJournal - Thu, 2014, Mar20 - 10:42

Even the most beautiful Rails application can lose its elegance if not deployed correctly. Like other Ruby frameworks or languages, such as Sinatra, Rails is based on the Rack interface. This article provides a basic introduction to Rack hosting and Rack-based application deployments. more>>

Cloud Computing Basics—Platform as a Service (PaaS)

LinuxJournal - Wed, 2014, Mar19 - 12:14

Generally, good programming is considered to be the measured application of an art form, craft or discipline, with the objective of producing a competent and evolving business solution. In traditional environments, computer programming is a practice that has multiple phases, such as designing, developing, testing, debugging and maintaining application code. more>>

Solid-State Drives: Get One Already!

LinuxJournal - Tue, 2014, Mar18 - 14:22

I've been building computers since the 1990s, so I've seen a lot of new technologies work their way into the mainstream. Most were the steady, incremental improvements predicted by Moore's law, but others were game-changers, innovations that really rocketed performance forward in a surprising way. more>>


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