Hey there, thanks for taking the time to read my blog. My name is Valentin aka “xenuser” and I am currently working as a Cloud Architect in Munich, Germany. While I mainly worked with DRBD, Zarafa, Kolab, Samba, KVM, clustering stuff, Cfengine, OpenLDAP, FAI and other exciting open source technologies in the past, I am now mainly busy with maintaining and expanding a cloud platform. Doing that, I mostly use tools like Puppet, Salt (SaltStack) and reprepro.
From time to time  I am also asked to write an article for the print media.

In my spare time I love to learn new things in the areas of open source, virtualization, Linux and IT security. Like most other geeks I read and watch Scifi stuff whenever I have the time to.

In addition I try to contribute to the open source community by publishing own tools, submitting bug reports and patches, participating in discussions (e.g. the latest WHOIS protocol debate), writing tutorials, translating documents from English to German and vice versa (e.g. for the Xen community) and help out in various message boards. I am always willing to learn, but at the same time want to share the little knowledge I already gained.

This blog was created for sharing the stuff I have in mind. Most of the blog entries will be about Linux, open source or IT security. Please feel free to contact me if you have any feedback, questions or simply want to drop a short notice.

About using the Glider
As you might have noticed, I am using the Glider. Although I am not a hacker, I am associating myself with the hacker culture. Today, the media often claims that hackers are destructive beings. Please notice that this is not something I am referring to when I use the term hacker.

Hackers are per definition creative beings, being able to learn and understand new things within a short amount of time. In many cases hackers are very intelligent and a little bit freaky at the same time. Nevertheless, today many popular open source products are based on the work of hackers. Without hackers, the Internet and IT-world itself wouldn’t be the same place. That is why I am associating myself with this culture.

When the media calls someone a “hacker”, they often want to describe a human being breaking into a computer system and leaving a mess behind. This is not what I consider as a hacker, and the hacker culture often does not support the actions of single individuals who can be called “crackers”.

I myself disapprove any action which can be considered as destructive behavior, like defacing websites or stealing the personal data from human beings.

About the security stuff
As you might have already noticed, there are some pages on this blog which describe flaws in web applications and methods to exploit them. Please know that I researched these things as a hobby and in order to help keeping these applications safe. In most cases, the devs received an e-mail from me before I went public.
Today I am no longer looking at the security of web applications since I moved on to other topics of personal interest.

 
Contact me
Well, that’s it! I hope you enjoy reading my blog as much as I enjoy writing for it. Please do not hesitate to comment on a blog post or drop me an e-mail at valentin[at]xenuser.org!

Twitter: xenuser@Twitter