Category Archives: Devops/Linux

During development it often occurs that with local testing, docker is used for building and running container images. Then, when working with a local kubernetes cluster such as for instance k3d, you also want to test out kubernetes deployment. This … Continue reading →

In April 2024 I successfully passed the CKS certification exam, but compared to the Certified Kubernetes Application Developer and Certified Kubernetes Administrator this was the toughest one yet. Not because the exam is particularly hard. The questions were all in … Continue reading →

After the debacle with Rocky linux and Red Hat, I decided to move to a more future proof setup with my kubernetes cluster fully running on Debian. I chose Debian 12 at the time but unfortunately Nvidia did not yet … Continue reading →

Upgrade for centos/rocky linux to new major versions is not supported. If you look for it there are procedures, but the changes between major versions can be so siginificant that this is not a good idea. Therefore, an approach I … Continue reading →

When I setup my kubernetes cluster using kubeadm some years ago, I decided to use a simple non-HA setup of kubernetes, because (1) it simplifies the setup and (2) the cluster will be running on a single server anyway. In … Continue reading →

I am experimenting currently with argocd with the aim to have an (almost) fully automated bootstrapping of my kubernetes cluster at home. One of the first things to do when experimenting is to have a test environment. There are different … Continue reading →

After setting up my kubernetes cluster at home back in June 2021, one of the first things I noticed was a lot more noise from the server. Apparently, it was just a lot of disk IO coming from kubernetes and … Continue reading →

I got a new laptop last week for work and needed to get it ready. Now new laptops usually mean new hardware and that can spell problems if you are installing linux. This is because the latest hardware may be … Continue reading →

This post describes how to monitor logs in kubernetes with grafana and loki. This covers the use case of logging for troubleshooting purposes. That is, it allows analysing human readable logs coming from multiple systems in one aggregated log. Human … Continue reading →

One part of the migration of my old setup to kubernetes is the migration of an old Jira 6.1 instance. Unfortunately, running that same jira instance in a container did not work because of licensing issues, and apparently it is … Continue reading →