Here is my highly opinionated list of resources to learn development concepts “beyond if-else” applicable to multiple programming languages.

With docker-slim I reduced the size of my Docker image from 998MB to 92MB. Here I describe how to do that.

I've just recently stumbled over a composer configuration which changed my life (for the better): preferred-install source.

On one of our sites where we employ "classical" deployment (without docker containers), we have found weird problems related to the deployment: Sometimes, the updated markup was not delivered by the server, but the server was still delivering the old markup. This story is a deep-dive of what we found, what we learned and how we finally fixed it. In the end, it's just a tiny NGINX configuration change ;-)

I want to share my experience with the open-source photo gallery HomeGallery suitable to host tens of thousands of photos on a Raspberry Pi for access with different screen-sizes (desktop computers and smartphone). I absolutely love it! The UI concept and the performance are great.

Subtle changes in the SQL queries and schema can have huge impacts on performance of the application. This is a showcase for one particular pitfall.

Writing an online Mandelbrot Set has been on my mind for quiet some time now. The code is meant to be a more complex "Hello World" WebAssembly program. After all: we must deal with complex numbers.

A couple of days ago our monitoring notified us about high disk usage on our GitLab server. Some investigating and a little script helped us to reclaim a lot of disk space.

Upgrading React Native projects in practice is not so easy - our workflow makes it well workable.

Let's install Pi-hole on your Raspberry Pi server (prior blog post) and let it eat ads. In this blog post I explain the installation and configuration of the Pi-hole and how to use it LAN-wide.

I walk you through my way of setting up a new Raspberry Pi as a server. Note that this is only one of many, many ways to setup a server. I choose this one because I find it easy and the result "good enough" to get started.

We are building our own 2 WAN gateway on a Banana Pi R2. I want to share my experience during the installation of the OS until the first SSH connection.

Quite some time ago we tried out BigBlueButton and we still use it today. Sometimes for full-fledged meeting with recording of session. Sometimes for opt-in video only when we talk via another tool. Now we decided to update to BigBlueButton 2.3 and install it on a new server with a fresh operating system.

Third party services are used in almost every website these days and managing consent settings can be quite the struggle both for the service provider and the client. Therefore, we developed a user- and client-friendly solution for Neos: CookiePunch.

Longer-running processing loops can be hard to test - using Generators is an unconventional but useful way to suspend and resume processing, leading to easy and expressive tests.

At Sandstorm we use Mailcow. It comes with a very nice Web-UI both for administration and accessing mails, calendars and contacts. User can enable 2-factor-authentication which is great. One details caught our attention though: users can access the Web-UI via an unencrypted HTTP-connection. Here I want to explain how we fixed that.

Mit Linguist und Exply ein language breakdown time series chart erzeugen.

Wie sieht golang aus? Hier findest du ein Mehr-als-Hello-World. Wenn man eine URL aufruft, sieht man wie oft diese bereits aufgerufen wurde. Ein Mini-Beispiel, um sich golang mal anzuschauen.

Wieso ist eine Software keine einmalige Anschaffung? Wie lange hält meine Software und welche Einflüsse gibt es? Wie kann ich so ein Update eigentlich entwickeln?

Wie sieht PHP aus? Hier findest du ein Mehr-als-Hello-World: es spricht HTTP und lädt bzw. speichert Daten.

For me, this book is relevant because it frames abstract concepts very clearly, attaches concise names to them, and shows their implications. It sets the stage for a discussion about software design - independent from specific languages or frameworks. This review summarizes my take aways.

Currently we are taking a closer look at Mailcow. During testing we asked ourselves: how can an administrator disable the 2F without logging in as this user? This was surprisingly difficult. Especially after sogo-tool did not reset SOGoGoogleAuthenticatorEnabled .

Every year around christmas time, I am revisiting our internal architecture. About two years ago, we took the plunge into Kubernetes. Due to an upcoming server move, I have revisited our options for running Kubernetes - and I'd really love to use k3s. In this article I explain what it took to run a development version of this setup on MacOS.