Oct 092014

Article by Charles McColm first published on FullCircle, issue 88

Physical media is cumbersome.
If you own a lot of DVDs, Blueray discs, VHS, or, gasp!, Discovision (circa 1978), you know how ugly it looks stored in your living room by your entertainment system. Digital media is hot for its portability between devices. Ripping DVDs is a fairly simple process and there are lots of guides around that show how to install and rip movie DVDs using Handbrake. But what about those multi-movie DVDs or DVDs with multiple episodes of a television show? Handbrake can rip those too and the process is fairly simple.

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Sep 302014

Article by Daniel Miessler first posted on his blog

lsof is the sysadmin/security über-tool. I use it most for getting network connection related information from a system, but that’s just the beginning for this powerful and too-little-known application. The tool is aptly called lsof because it “lists openfiles“. And remember, in UNIX just about everything (including a network socket) is a file.

Interestingly, lsof is also the Linux/Unix command with the most switches. It has so many it has to use both minuses andpluses.

usage: [-?abhlnNoOPRstUvV] [+|-c c] [+|-d s] [+D D] [+|-f[cgG]]
 [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+|-M] [-o [o]]
 [-p s] [+|-r [t]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [--] [names]

As you can see, lsof has a truly staggering number of options. You can use it to get information about devices on your system, what a given user is touching at any given point, or even what files or network connectivity a process is using.

For me, lsof replaces both netstat and ps entirely. It has everything I get from those tools and much, much more. So let’s look at some of its primary capabilities:

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Sep 292014

The most new and dangerous bug around it’s the one called “shellshock”, this is a security bug in the widely used Unix Bash shell which was disclosed on 24 September 2014. Many Internet daemons, such as web servers, use Bash to process certain commands, allowing an attacker to cause vulnerable versions of Bash to execute arbitrary commands. This can allow an attacker to gain unauthorized access to a computer system.

The bug causes Bash to unintentionally execute commands when they are stored in specially crafted environment variables. Within days, a series of further related vulnerabilities in Bash were found, leading to the need for further patches.

By 25 September, botnets based on computers compromised with this exploit were being used by attackers for distributed denial-of-service attacks and vulnerability scanning, source wikipedia

Let’s see how to check if your computer or server is vulnerable.
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Sep 142014


I’ve recently bought an offer for Sanctum 2 on Steam, and while at the start I was a bit skeptic, I must say that I like this mix between a Tower Defense and an FPS.

Sanctum 2 is the sequel to the world’s first Tower Defense/FPS hybrid game
Pick from four unique character classes and take up the mission of protecting the Cores from hordes of mysterious aliens. In Sanctum 2 you play your character exactly the way you want through the new and extensive customization system. Pick your own loadout of towers, weapons and perks, and pick well, because you are humanity’s last defense against the hordes set out to destroy it.

The normal cost of the complete bundle that includes the game + 5 DLC it’s around 23 € on Steam, but if you like it I suggest to put it on your wishlits and wait for some offer, the game it’s a bit old and so offers should be frequent, I got it with a discount of the 70%

The game has a great graphics, still it’s playable on my crappy computer, and both the solo campaign and the online co-op multiplayer are funny enough, so let’s see now some detail about this game:

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Sep 132014

Article by Stuart Burns first posted on Openlogic.com

With Red Hat Enterprise Linux 7 released and CentOS version 7 newly unveiled, now is a good time to cover systemd, the replacement for legacy System V (SysV) startup scripts and runlevels. Red Hat-based distributions are migrating to systemd because it provides more efficient ways of managing services and quicker startup times. With systemd there are fewer files to edit, and all the services are compartmentalized and stand separate from each other. This means that should you screw up one config file, it won’t automatically take out other services.

Systemd has been the default system and services manager in Red Hat Fedora since the release of Fedora 15, so it is extensively field-tested. It provides more consistency and troubleshooting ability than SysV – for instance, it will report if a service has failed, is suspended, or is in error. Perhaps the biggest reason for the move to systemd is that it allows multiple services to start up at the same time, in parallel, making machine boot times quicker than they would be with legacy runlevels.

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