My 3D printing journey
I am 3D printing for a while now and want to share my experiences so others can benefit from it and maybe also get motivated to start with this fascinating hobby. I will cover my beginning with a 3D pen, my experience …
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Kubernetes Requests and Limits explained
During my work as IT freelancer I frequently I encounter common misunderstandings about the kubernetes requests and limits which lead to unstable systems and wasted resources. So this blogpost explains what the meaning …
Find all ubuntu packages not from standard repositories
When upgrading from one ubuntu version to the next one, I like to use the opportunity to do some spring cleaning. To find from which repositories a package was installed we can use: dpkg -l | grep "ii" | awk '{print $2}' …
Golang for Java-Coders
The mocking gopher: a fitting mascot for golang I want to share my experiences when I started programming in Golang from my perspective as a Java Coder. What is this and why??? So first I wanted to know what is Golang. …
Migrating from Vaadin 7 to Vaadin 8
Hohoho, Vaadin 8 is out! Last night I couldn’t sleep and having read the release announcement of Vaadin 8 on the Vaadin Blog ( https://vaadin.com/blog/-/blogs/vaadin-framework-8-is-out ) I was curious to give the new …
WTF: physical scrum boards
On every scrum project I have the same discussions with the scrum master. Why on earth would we want to use a physical scrum board? I then hear some cultish praises of awesomeness in favour of the physical scrum board …
Flashing Cyanogenmod 11 on the Samsung Galaxy S3 Neo+ GT-I9301I
He tried to flash his S3 Neo! Repeatedly I went to a lot of pain flashing my S3 Neo because I did not write down how I did it the last time, but not again! This tutorial assumes you know what you are doing, you can …
Using Docker in Production
Linux containers are around for quite some time and docker has built a nice toolsuite around the kernel-features for process-isolation (namespaces, cgroups, etc.). The isolation technology is part of the kernel for …
Lenovo E540 Standby Problem on Ubuntu 14.04
UPDATE: Lenovo fixed the Bios, after a bios update standby + USB 3.0 enabled work. I used the geteltorito.pl-method descriped in the thinkwiki: http://www.thinkwiki.org/wiki/BIOS_Upgrade I was furious about a very …
Converting videos with ffmpeg to webm format under Ubuntu 14.04.
I just love ffmpeg, because it is so easy to use and scriptable. Install FFMPEG on Ubuntu 14.04 sudo apt-add-repository ppa:jon-severinsson/ffmpeg sudo apt-get update sudo apt-get install ffmpeg Convert a video to webm …
Guide to limits.conf / ulimit /open file descriptors under linux
Why does linux have an open-file-limit? The open-file-limit exists to prevent users/process to use up all resources on a machine. Every file-descriptor uses a certain amount of RAM and a malicious or malfunctioning …
Unit-Tests with Fortran using pFUnit (supports MPI)
Real world example A friend of mine is meteorologist and wrote a radiative transfer model in fortran and finally we integrated pfUnit into cmake (autoinstall!) and he wrote some first tests. Have a look here for the …