Posts on Jakub Žilínek

Homelab - How I managed to kill my K3S with SQLite

Sun, 16 Mar 2025 12:30:00 +0000

How it started

One day I have tried to use my plex instance and it was unreachable. I started digging into it.

There were couple of containers that wouldn’t start and also inspection using k9s CLI was taking ages.

Started digging

I have started looking into logs, I saw couple of issues related to SQL - like slow queries.

Then I remembered that K3S is using SQLite as default database, which may not be ideal, for long living clusters.

Homelab - My Kubernetes Journey

Sun, 16 Mar 2025 12:00:00 +0000

Before It Started…

When I began working as a DevOps engineer at Košík.cz, I started using Kubernetes daily for the first time. I quickly realized I had basically no clue how it worked or how to properly manage it. After reading many blogs and exploring Kubernetes for about a year, I noticed much of the setup had been done by my colleagues.

I decided to buy a Raspberry Pi 5 8GB and start my own homelab where I would set up an entire Kubernetes cluster myself. My goal was to gain fundamental knowledge about core components of cloud computing.

Networking - MetalLB

Sat, 15 Mar 2025 12:00:00 +0000

Take a look at K3S and MetalLB

Networking - Nginx Ingress Controller

Sat, 15 Mar 2025 12:00:00 +0000

Nginx Ingress Controller and k8s routing

Networking - External DNS + Pihole

Fri, 14 Mar 2025 12:00:00 +0000

Disclaimer:

This is a documentation of how I did networking in my homelab. It is not a tutorial, but rather a collection of notes and links to resources that helped me along the way. I will try to keep it up to date as I learn more about networking and Kubernetes.

External DNS

Introduction

External DNS is a Kubernetes controller that manages DNS records dynamically. It automates the process of creating and updating DNS records in external DNS providers based on the services and ingress resources in your Kubernetes cluster. Source code can be found here.

Networking - HTTPS + Cert Manager

Fri, 14 Mar 2025 12:00:00 +0000

Disclaimer:

This is a documentation of how I did networking in my homelab. It is not a tutorial, but rather a collection of notes and links to resources that helped me along the way. I will try to keep it up to date as I learn more about networking and Kubernetes.

Cert Manager

Introduction

Cert Manager is a Kubernetes controller that automates the management and issuance of TLS certificates from various issuing sources. It can be used to obtain certificates from Let’s Encrypt, HashiCorp Vault, Venafi, and other certificate authorities. The main goal of Cert Manager is to simplify the process of obtaining and renewing TLS certificates for your applications running in Kubernetes. The source code of that controller can be found here