Author: mathis

Sometimes I am at the point where there’s too much log output, but I don’t want to send everything to /dev/null because of some rare bug. The easiest way I know to retain some fixed amount of logs is to use rotatelogs from Apache HTTPD – e.g. in the following fashion:

Some time ago I collected some boxes of slides from my parents and parents-in-law. The pictures were taken in the 70s and 80s and it would be a shame to disregard them, so I set out to create a workflow to digitize them. I bought a CanoScan 9000F Mark II because the Linux support is… Read more Use Canon CanoScan 9000F Mark II to digitize slides and prints on Linux

The recent events revealed that the internet is not a very safe place. If you don’t encrypt your data, it is likely to be analyzed by third parties like intelligence services. So you start to encrypt everything because you care for the safety your customers data. You managed to get it done without extra budget… Read more Certificates and the JVM

For some time now, Android development in Eclipse made me stumble in one point: the libraries. When you develop an app, there will be some third-party library you can use – and it’s easy to do so, just drop it into the “libs” directory. The Android Development Tools (ADT) take care of adding it to… Read more Developing Android apps in Eclipse

Did you ever remember that you coded something exactly the way you need it now but don’t know the project name anymore? – Was it this one? (check out project, click through the files) No… wait, perhaps this one? (check out project, click through the files) No… *sigh*

I have put together a howto document to describe how the internet access on a linux computer can be filtered, and daily/weekly/monthly email reports can be sent for monitoring purposes. This was meant as a replacement for the program “Safe Eyes” as it would not run on Linux. PDF howto (6 pages) There are some… Read more Filter and monitor web access on Linux transparently

You just deployed your Java web application to production and everything is working – great! And as you always follow best practices, you included some meaningful metrics via JMX beans. You tested them locally and in test stage. But production servers have an extra firewall which prevents you from accessing any port except your web… Read more JMX and firewalls