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.
Submitted by Bernd Helmle on Thu, 25/02/2010 - 12:02
The PostgreSQL project just released the Alpha 4 of its upcoming PostgreSQL 9.0. The Alpha4 version of the upcoming PostgreSQL 9.0 release is ready for download. It is planned that Alpha4 will be the last Alpha version before the Beta release cycle for PostgreSQL 9.0. Some highlights of this release are:
Submitted by Bernd Helmle on Thu, 25/02/2010 - 11:57
The series "PostgreSQL Optimiser Bits" will introduce the strategies and highlights of the PostgreSQL optimiser. We start today with a new feature of PostgreSQL 8.4: Semi and Anti Joins.
Since version 8.4, PostgreSQL has been offering a new optimisation strategy for the optimisation of certain queries: Semi and Anti Joins.
A Semi Join is a specific form of a join, which only takes the keys of relation a into account if these are also present in the associated table b. An Anti Join is the negative form of a Semi Join: that is, a key picked in table a will be taken into account if it is not present in table b.
Submitted by Roland Wolters on Thu, 25/02/2010 - 11:18
The Debian project has announced that its internal DNS infrastructure is gradually moving over to DNSSEC. Thus from now on, all DNS answers for debian.com, amongst others, will be digitally signed to verify their authenticity. The Domain Name System (DNS) is one of the core components of the Internet. However, the initial design of DNS is vulnerable against some quite serious attacks, among them cache poisoning which means faking of DNS answers. To avoid this problem, DNSSEC was introduced (DNSSEC in Wikipedia, see also dnssec.net).
Submitted by Roland Wolters on Wed, 24/02/2010 - 16:09
One of the fastest ways to restrict the access to a web server path is to use .htaccess files. These are placed in the to-be-restricted path and contain the information how to restrict the access. A simple example is given below:
Submitted by Roland Wolters on Wed, 17/02/2010 - 13:42
A couple of hours ago Nokia and Intel announced that they plan to merge their mobile Linux platforms to create a common base: MeeGo. Giants Intel and Nokia have had their own Linux platforms for some time; Nokia was developing Maemo while Intel pushed Moblin forward.