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Tutorial

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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Synchronizing Time With NTP and Ansible

When having multiple machines it makes sense to have them all using the same time. Otherwise it's pretty hard to track what happened where, especially when looking at logs. This is managed using the Network Time Protocol (ntp), and there's a package for that named ntp.


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Try Kubernetes in a Snap in Ubuntu 18.04

If you want to try Kubernetes locally you're in for a lot of trouble. Installing it requires you to deal with changing apt repos, installing docker, installing kubectl and kubeadm, provisioning, installing networking, configuring the keys for cluster access, etc. Fortunately Ubuntu offers an easier way, via snaps.


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