This pumped up Pimoroni Unicorn HAT HD is an incredible toy. The content of the kit looks like the following: – a 256 RGB LED pixels in a 16×16 matrix. Pixels driven by ARM STM32F and three STP16CPC26 LED drivers – Bundled ninja diffuser – Nuts(4) and bolts (8 + 3 spares) I was able… Read More »
Because this month is my Birthday like a true big kid I brought some toys. What better place to buy shiny and sparkling new toys can you find compared to Pimoroni ? The service was very fast and I really liked the presentation: So what is the content of the box and the reason for… Read More »
I have a nice mechanical keyboard “VicTsing® Mechanical PC Gaming Keyboard 87” with German layout, but I prefer my Windows 10 in English. The quick solution the use the keyboard was to add also German language support but kept English as default language. Then the most annoying and frustrating thing kept happening: 1. I selected… Read More »
Following is a simple and easy way to do a consistent back-up of the /home directory (usually mounted in a separate partition) on a running system. We do not have the luxury of being able to stop the operations of a server and unmount the home partition to make sure no changes are done during… Read More »
Sometimes really simple questions are hard to answer. One day I got the question from a coworker: “How do I know if some installed RAM is ECC or not”. The easiest way is to use dmidecode command that dumps in Linux all the system characteristics. But because I had no idea how to see if… Read More »
Lately after one of the updates of docker binaries I started to have a strange issue in a Docker Swarm setup configured here. Services were no longer able to see each other if they were running on different nodes. If two services were running on the same swarm node there was no issue. This is… Read More »
In a perfect German tradition Conrad electronics shop released an Advent Calendar for Raspberry Pi. You can buy it online or from a Conrad shop if you get to go to Germany in a town with a Conrad shop. Got mine from the Conrad in Leipzig but online is available at Conrad Online There are… Read More »
“Invisible columns”: This is a new feature introduced in Oracle 12c that got me all excited.In short you can now have hidden columns in a table that are not visible to the standard SELECT, INSERT clauses if you do not want to. Some usage for this: Legacy application queries I hate how you have to… Read More »
The newest commodity this days is crowd sourced data. All the digital corporations push this envelope harder and harder. Google wants to make me a “local guide”: post images of places on google maps and review businesses for free of course (they give you a badge, you know like boy scouts badges). This is lately… Read More »
Sometimes you get a CA certificate in DER format and some application requires it in a PEM format. OpenSSL to the rescue: # openssl x509 -inform der -in myCA.der -out myCA.pem