Entrepreneur – Developer – Computer scientist

I’m an entrepreneur, a developer and a computer scientist at heart. As a serial entrepreneur, I’m focussing on technical excellence founded on my Computer Science major from University of Technology in Graz, Austria. My diploma thesis is titled Balancing Humanoid Robot Gait Using Programmable Pattern Generators and can be downloaded here.  This thesis was written at the Institute for Theoretical Computer Science under supervision from Prof. Dr. Wolfgang Maass.

If you are interested in my curriculum vitae just click on the appropriate link on the right. It’s a little dated though, so maybe rather get in touch with me directly 😉 Moreover you can find some travelling blogs (in German) and several Howtos for Linux and Windows operating systems on this page.

Feel free to browse around!

You can reach me at florian AT hackenberger DOT at

Recent blog posts

• Backup for Btrfs with BtrBk
  For my Linux laptop, I was looking for a replacement of my previous backup solution, which used rsync and was therefore quite slow, as it had to sift through the whole filesystem. As I migrated from ext4 to btrfs during my last OS upgrade, I switched my backup system to use the (quite simple) btrbk … Continue reading Backup for Btrfs with BtrBk →
• How-to Telekom Glasfaser PPPoE modem
  The 2.5Gigabit fiber modem that Deutsch Telekom sells needs a PPPoE connection, even with a subscription like Company Pro. Here’s a little how-to for testing the connection to it on Ubuntu, before trying to get it working with a third party router. After connecting and registering the modem, I plugged it into my laptop. It … Continue reading How-to Telekom Glasfaser PPPoE modem →
• How-to: PostgreSQL upgrades on large DBs
  TL;DR; Use pglogical to upgrade between major versions of PostgreSQL with minimal downtime when running very large DB installations. For databases beyond a couple of GB in size, an upgrade between major versions of PostgreSQL would need to use pg_basebackup and pg_upgrade, but at a size of around 1TB, even this means too long of … Continue reading How-to: PostgreSQL upgrades on large DBs →
• Firefox 3.0 SSL encryption error page
  Just so others can find this trick more easily: In order to make accepting self signed certificates a little easier in Firefox 3.0, visit the page about:config and set the following values: browser.xul.error_pages.expert_bad_cert  true browser.ssl_override_behavior 2 Here are the relevant links to the mozilla knowledge base: http://kb.mozillazine.org/Browser.ssl_override_behavior http://kb.mozillazine.org/Browser.xul.error_pages.expert_bad_cert As soon as these values are set, … Continue reading Firefox 3.0 SSL encryption error page →
• Recovering from missing (or wrong) LVM2 (EVMS) metadata
  I just want to document one possible procedure, as it may prove helpful to others. The setup of the system was as follows: Three disks in a RAID5 array, LVM2 with evms metadata on top and a single ext3 filesystem within an LVM2 logical volume spanning the whole RAID array. Two disks of the array … Continue reading Recovering from missing (or wrong) LVM2 (EVMS) metadata →