Submitted by Roland Wolters on Wed, 24/03/2010 - 15:30
This week, credativ launches its Open Source Support Card. With this card Open Source Support can be bought at a fixed price - without a binding contract. After a long preparation phase we are now offering our trusted services in a new, simple format; with the Open Source Support Card you get a fixed contingent of project-specific, pre-paid services. Customers using the Open Source Support Card have the unique advantage of full cost control; the card can be purchased as a product, without any obligation to sign an agreement for a specific length of time.
Submitted by Roland Wolters on Fri, 19/03/2010 - 13:55
Many digital cameras today do not just save an image, but also save various meta data in the Exif standard. This data includes information about the position of the camera when the image was taken (such as vertical or horizontal). However, some image programs use this data to rotate the image when displaying it while others don't, leaving the user to face inconsistent behaviour. This can be fixed with the tool exiftran; it automatically rotates all images according to the Exif data, which it discards afterwards. It is also very easy to use for mass conversion:
Submitted by Roland Wolters on Fri, 19/03/2010 - 11:20
The tool chain of a sys admin should always be comprised of effective tools. Today we are introducing the package sysstat.
Sysstat is a collection of command line tools dedicated to providing the system administrator with a quick overview of the performance of the system. They work as front-ends to the Kernel and therefore can never provide more data than the Kernel itself gathers, although the interface is much more user-friendly than querying Kernel parameters manually.
iostat is the way to go if there are problems with the throughput of a disk, NFS storages or the CPUs. For example, if your system is behaving strangely, iostat can be used to identify I/O waits:
Submitted by Roland Wolters on Mon, 15/03/2010 - 10:21
During the Games Developer Conference the Khronos Group released new versions of its widely used 2D and 3D graphics API, OpenGL. Besides the expected Version 3.3, they also released OpenGL 4.0. From 2004 - 2008 there was so little movement from OpenGL that it was practically announced dead, falling badly behind its competitor DirectX. However, since 2008 the responsible Khronos Group has regained its footing and focused on the further development of the graphics specification. In 2008 version 3.0 was released and in 2009 two more releases followed. 3.3 was on the cards for this year's Games Developer Conference, and OpenGL did not disappoint. However, the audience was caught by surprise when the immediate availability of OpenGL version 4.0 was also announced.
Submitted by Roland Wolters on Fri, 12/03/2010 - 10:00
Phoronix has used its Test Suite to compare the memory and power consumption of different desktop environments. However, the results should be handled with care. The "Power & Memory Usage" test was done to evaluate whether XFCE and LXDE consume less power and memory compared with their "big" siblings KDE and Gnome. The tests were done on a stock Ubuntu installation. At first glance the results suggest that KDE consumes much more power than the others. However, these results are misleading. For a start, measuring memory consumption is all but an easy task and requires a lot of thought.
Submitted by Roland Wolters on Thu, 11/03/2010 - 14:49
This week we moved our blog to a new blogging software: Movable Type. Besides the technical advantages it is now much easier for us to display the same article in different languages. credativ is a multinational corporation with employees of different nationalities. This became problematic when we first started experimenting with our company blog: articles were published in English as well as in German and most of them translated into both languages... the site quickly became a mess. To get around this problem a new workflow was designed - but unfortunately the blog engine we were using at the time, Wordpress, couldn't really accommodate it.
Submitted by Roland Wolters on Wed, 03/03/2010 - 13:55
The Red Hat Cluster Suite is a framework to bind two or more machines together to jointly handle one task. The following article gives an introduction to RHCS in terms of service failover. Linux is used daily in mission-critical environments all over the world. It follows that Linux can be required to fulfil a range of needs with relation to availability and stability. The Red Hat Cluster Suite (RHCS) is designed with these needs in mind; it enables the admin to set up a cluster of machines which all handle the same task or provide the same service. If the machine providing the service goes down, another machine then steps in and takes over.
Submitted by Roland Wolters on Tue, 02/03/2010 - 11:29
The administration of a large number of servers can be quite tiresome without a central configuration management. This article gives a first introduction into the configuration management tool, Puppet.
Submitted by Roland Wolters on Mon, 01/03/2010 - 17:08
Currently I am testing the browser rekonq, a WebKit based KDE browser which is handled as the next KDE default browser by some. If that might happen or not is a question best left to the future, but the browser itself has some nice features in the current version 0.4 beta: kwallet integration, addblock, plugin support, etc.
Submitted by Roland Wolters on Fri, 26/02/2010 - 13:14
credativ employee, Alexander Wirt, is due to give a presentation at the German Chemnitz Linux Days about Single Sign On with Kerberos. Besides an introduction into configuration of Kerberos, the talk will also focus on the configuration of its various services.Kerberos is an authentication protocol which enables an admin to incorporate services and an operating system transparently into an existing setup. This makes Single Sign On possible: the user only has to enter his/her credentials once and thereafter can access any secured services and websites which support Kerberos without having to enter them again.