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Let’s build a raspberry pi cluster

In June 2018 I came in contact with Raspberry Pi’s for the first time and learned to appreciate and love the little boxes. At a cost of 35€ per computer, I originally decided to conduct control experiments for a smart home with the Pi’s. As a programmer, I then came up with the idea of connecting several Pi’s together to form a supercluster – to speed up complex calculations like the Mandelbrot set. The latest goal will be to […]


Hello World

Welcome to the blog of my homepage! Here I will write about cats, vacations, IT security, Android, Python, Raspberries, Music, Unity3D, Linux and Windows. Not always regularly, because I may go to work – but every now and then. I also like to take topic suggestions.
Have fun browsing, reading and learning. Jens


Hitchhiker’s Guide To Westeros

Westeros is a beautiful island. And just as deadly. Hitchhiker’s Guide and Westeros? What will that be? A travel guide? Let yourself be surprised! Don’t Panic! Welcome to my first blog!

What is this all about?
The final assignment to earn my nanodegree in Data Visualiszation expects me to write a blog. A blog about the things I learned. A blog? I don’t have a Facebook account, on Instagram I only read along with travelogues about the Arctic, and in general […]


ELK Install

Ich versuche gerade, einen ELK-Server aufzusetzen, dem ich über Filebeats von Clients Loginformationen an Logstash schicken kann.


# Ubuntu updaten,
# Pakete upgraden,
# und die Distribution auf den neuesten Stand bringen

sudo apt-get update -y
sudo apt-get upgrade -y
sudo apt-get distro-upgrade -y
sudo apt install -y

# Java für den Elastic Stack installieren
# es muss die Version 1.8 (8.0) sein

sudo add-apt-repository ppa:webupd8team/java -y
sudo apt-get update
sudo apt-get install -y oracle-java8-installer

# Curl zum Testen des Stacks installieren
sudo apt install -y curl

# Netstat nachinstallieren
sudo apt install -y net-tools

wget […]