Christoph Haas is a system administrator and web application developer with 17 years of experience in this field. He received a diploma in Computer Science and is currently leading the IT department of a software company in Hamburg, Germany. In his spare time he contributes to the open source community as a Debian developer or by working on websites like http://screenshots.debian.net/ that he is currently refactoring in Ruby on Rails. Some of the most noticeable contributions are the mail server tutorials he maintains on his website http://workaround.org/.One of the most important aspects of system administration is monitoring the IT infrastructure properly. Christoph has been setting up monitoring systems all the way back to when Nagios was still called Netsaint. He even dedicated his diploma thesis to monitoring.