Studying for the CKA, I am upgrading my homelab Kubernetes cluster for the first time and I though I should document the process for a better learning experience. Useful links The Kubernetes Documentation Changing the Kubernetes package repository Upgrading kubeadm clusters Upgrading a Kubernetes cluster Upgrading a Kubernetes cluster for the first time can seem scary. Going into this I didn’t really know what to expect. I knew that Kubernetes is complex and has a lot of different parts holding everything together. I also knew that it isn’t as simple as just running an upgrade command. ...

My homelab is growing In December my Christmas gift to my self was a Raspberry Pi 5 and two Lenovo Thinkcenter m720q. Yes, I guess I was nice this year. It was going to be three or four Raspberry Pi 5s, but I change my mind after ordering one Pi and ended up with a mix. Oh well, shouldn’t matter too much. The reason I bought this was to finally set up a Kubernetes cluster in my homelab on bare metal. I have done some experimenting with setting up a K8s cluster in Proxmox. But I didn’t want to have a combined NAS, hyperscaler AND Kubernetes cluster all in one physical machine. And have been wanting to create a Raspberry Pi cluster for a long time. And in my humble opinion, bare metal is just cooler than VMs. ...

tl;dr: There is a new version of the terraform associate certification (004). It is mostly the same as the previous version (003) but with 4 new topics added. Terraform? Terraform might be the de facto standard when it comes to infrastructure as code (IaC). It is a way of using declarative code to provision cloud resources. Today everything has an API, but all APIs are different. With Terraform you write simple HCL, which really doesn’t feel much more complex than JSON. This gets translated to a providers API requests. And there is a provider for everything from Azure and AWS to Minecraft and Spotify. ...

The year of Kubernetes There’s a new year, 2026. And there is one thing I’ve heard many many times last year, which is is: If there is one thing or technology your should learn to be relevant as a DevOps engineer, it is Kubernetes. So that is what I intend to do this year, learn Kubernetes. And I am going to document my journey from knowing next to nothing to hopefully becoming a Kubestronaut. ...

So whether you work as a developer, SRE or with devOps, a big part of your work happens in the terminal. And what ever you do, if you do it a lot of times, you will get faster. But repetition alone can only get you so far. And more often than not, when only comparing one to one self without seeing what is possible, you never evolve. I don’t know how many times i have hold down the left arrow key, watching the cursor slowly move left because i need to switch out k get with k describe, or add sudo, or fix a typo in the beginning of the command. At the same time thinking “I should really look up what the hotkey for jumping to the beginning of the line is. But now I’m already half the way, so I’ll just keep holding down the left arrow key and look it up later.” ...

tl;dr: rwx = 0111 = 7. -rwxr-xr-x = 0111 0101 0101 = 755. Ok, I want to make my file read/write/execute for me, and read/execute for group and others, easy: chmod 755 my_file.txt. Of course I know this. Want all permissions for everyone? 777. But, whenever I want anything else, I always have to google it. Well… NO MORE! Understand it to remember it After years of always forgetting and not really knowing how the permission for files are in unix like systems, I finally, when looking it up, found a way to remember it. And I found the way to remember it so cool that I want to share it with you! (Also I wanna make sure I remember it, so writing a short post is the perfect way). ...

What is Athena AWS S3 (Simple Storage Service) is the most used AWS resource. In S3 you can store all types of data in a multitude of file formats: Parquet, ORC, JSON, CSV, different types of logs, dumps from web scraping, database backups or snapshots, the list goes on and on. You can use it as a data lake and chuck in all your data. Just like your favorite desktop junk drawer. But then the day comes when you actually want to look at your data. This could require heavy ETL pipelines transforming and loading the data over to a relational database where you finally could retrieve your data using SQL. ...

tl;dr: Amazon Q is a gen-AI assistant from AWS. Amazon Q Developer - Getting started. AWS has also made a Neovim plugin. AI, Gen-AI, LLMs, Agents, MCP. There is so much AI hype. Everywhere I look they talk about AI. “AI is the future. If you don’t learn to use it right now you will never catch up.” I’ve been kinda sceptical to AI. As a developer I have used AI since the beginning of ChatGPT and GitHub Co-pilot, which feels like forever ago even though it has only been about 2 years. It is nice to save time by making it write boiler plate code and it is fun to make it create stories and song lyrics. ...

Complete The Cloud Resume Challenge The Challenge Part 1: Get AWS Certified and complete The Cloud Resume Challenge Part 2: HTML - Create a website Part 3: CSS - Style your website Part 4: Static Website - Amazon S3 Part 5: HTTPS - Set up Amazon CloudFront Part 6: DNS - Custom domain name with Amazon Route 53 Part 7-12: Backend - Creating a serverless API and requesting it with JS –> Part 13-16: CI/CD - Commit, Build and Deploy with AWS CodePipeline <– tl;dr: Creating a CI/CD pipeline for the frontend and the backend. Automating the deployment with AWS CodePipeline using GitHub as the source repository. ...

tl;dr: Use Flameshot to take screenshots and edit them directly before saving to a file or to the clipboard. Download at flameshot.org/download. Flameshot Flameshot is my favorite screenshot app and I have been using it for years. I’ve shown this app to lots of co-workers over the years since I find it super practical. I have to admit that windows and mac has stepped up their screenshot tools the last years, so everything isn’t as unique as it was the first time i tried out Flameshot. Still I find it the best tool for taking screenshots and I use it daily. ...