Kubernetes

Introduction When I first learned Kubernetes storage, my mental model was very simple. In real clusters, we, as developers, usually have a StorageClass configured by Kubernetes administrators. So the workflow I saw everywhere looked like this: flowchart TB A["User creates a PersistentVolumeClaim (PVC)"] --> B["Kubernetes calls the CSI provisioner"] B --> C["Storage system creates a new disk"] C --> D["Kubernetes creates a PersistentVolume (PV) automatically"] D --> E["PVC binds to the PV"] In other words: PersistentVolumeClaim is enough. ...

Setting up a Kubernetes cluster can seem like a mountain to climb, especially when you’re just starting out. However, having a local Kubernetes cluster is a fantastic way to get hands-on experience without worrying about cloud expenses. If you have a spare laptop sitting at home, this guide will help you turn it into a useful part of your Kubernetes home lab using k3s. Whether you’re using Linux, macOS, or Windows, this guide has got your back. ...

Introducing OneClickTLS: Generate Self Signed TLS and mTLS Certificates Instantly If you have worked with Kubernetes, Docker, microservices, or local HTTPS development, you already know how frustrating it is to generate self signed TLS certificates. Searching for OpenSSL commands, adjusting SAN values, fixing errors, and repeating the entire process again and again. After dealing with this pain for years, I finally built a tool that removes all the friction: https://oneclicktls.com ...

When you first work on a Go project that uses the Kubernetes client SDK, you might feel lost about how to debug it on your local environment. Don’t panic. It’s actually very simple once you understand what’s happening behind the scenes. I’ll walk you through how to make it work using VSCode as an example. The Common Confusion When your program is designed to run inside a Kubernetes cluster, it usually connects to the cluster using rest.InClusterConfig(). This configuration relies on the ServiceAccount token mounted at /var/run/secrets/kubernetes.io/serviceaccount/token. When you run the same program locally, that path doesn’t exist, and the SDK will fail to initialize with an error like: ...

1. Introduction In this tutorial, we will walk through the steps to create a local Kubernetes cluster with TLS certificates configured. This setup ensures secure communication between your Kubernetes components. 2. Prerequisites Docker installed on your local machine kubectl installed kind installed OpenSSL installed for generating TLS certificates 3. Install kubectl (Ubuntu) curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" chmod +x kubectl sudo mv kubectl /usr/local/bin/ Verify the Installation You can verify the installation by running the following command: ...