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Tutorial

How to Type Keys Using Germanium

One of the most common interactions in browsers is writing keys. Germanium has a trivially simple API to type keys, that includes shortcut handling, and special keys such as . Here's how:


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Assigning a Function on File Type in Vim

Ok, we have now a new function with our own code in vim. We can manually trigger it when opening a buffer. Let's make this function automatically be called whenever opening a file, and fiddle with file types.


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Creating a Command in Vim

I love vim. And one of the reasons that makes it so appealing is customization. One of the coolest things is the ability to create functions. You bind the functions to commands, and you simply call the commands for the execution.


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Creating Python Handlebars Helpers

If you're using handlebars in python, you're probably using pybars3. In handlebars most commands are defined by the language, such as {{if}} or {{each}}. What you need to know is that you can also write your own helper functions to extend the language. Here's how to implement a switch clause:


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Kubernetes Ingress Patching With Ansible

If you execute the default bare metal installation of an Nginx Ingress server you'll find out that it's actually not listening on the "normal" 80/443 ports, but rather on some client ports. What's worse is that there's a rather small limit for the proxying, so if you're exporting a binary registry, and you want to publish binaries from outside the cluster, you're in trouble. Here's how to fix this.


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Allowing Docker Containers Inside the Kubernetes Network

Let's assume you're spinning up pure docker containers in your Kubernetes cluster. Not pods, but docker containers. For example you're using docker.inside in your Jenkins builds, and your Kubernetes is hosting the Jenkins instance. You'll notice that your docker container can't access services in your cluster.


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Python Unit Testing

Python has bundled into it a rather decent testing framework, that resembles a lot JUnit, named unittest. This is packaged in the core python, and it's simple to use. While I'm a big fan of Behave, sometimes, especially if testing low-level APIs, it's less verbose to just write a core python unit test. In this article we explore how to create our first test.


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pa11y Accessibility Testing With Docker and Jenkins

Testing a website for accessibility might prove challenging. Fortunately with the advent of some opensource tools, it's easier to test for problems, but automating this is a challenge. In this article we'll explore how to setup a Jenkins pipeline that runs pa11y - a popular opensource accessibility checker - inside a docker container.


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Blacklisting Modules for the Linux Kernel

After the fiasco with the previous graphic card, I ordered a new one. Since Linux is Linux, nouveau was picked as the driver instead of the nvidia-drm. Because now we have a race condition: we just need to make sure that nouveau is never loaded first though.


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Embedding Diagrams Into Documentation in AsciiDoctor

AsciiDoctor integrates well with diagram editors that take their input from text, in a seamless way. AsciiArt, GraphViz Dot, and even UML are supported. Here's how to achieve that.


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