2 comments on “Kubernetes: POD vertial Scaling – Changing the Resource Limits of PODs without POD Restart”

Kubernetes: POD vertial Scaling – Changing the Resource Limits of PODs without POD Restart

In Kubernetes v1.27, the InPlacePodVerticalScaling feature was introduced as an alpha capability, allowing you to adjust CPU and memory resources of running pods without restarting them. This feature can reduce downtime and make resource scaling more efficient. In this guide,…

0 comments on “Cheat Sheet: How to install Kubernetes via kubadm on Ubuntu 24.04 (and trying to join it as an additional master to an existing cluster)”

Cheat Sheet: How to install Kubernetes via kubadm on Ubuntu 24.04 (and trying to join it as an additional master to an existing cluster)

ChatGPT helped in this task, but some commands did not work immediately, so I had to ask ChatCPT how to fix the errors I encountered. The command presented here leads through the process of installing Kubernetes using kubeadm on a…

124 comments on “Kubernetes horizontal POD Autoscaling – Hello World”

Kubernetes horizontal POD Autoscaling – Hello World

For a quick test of horizontal autoscaling of an NginX deployment, we need the following ingredients: a metrics server installation to be able to measure the POD's CPU an nginx deployment with a CPU reservation an auto scaler configuration a…

62 comments on “How I earned the Certified Kubernetes Administrator (CKA) badge – what would I do differently today?”

How I earned the Certified Kubernetes Administrator (CKA) badge – what would I do differently today?

What is the CKA? The Certified Kubernetes Administrator (CKA) certification proves you have hands-on experience managing Kubernetes clusters. How did I learn Kubernetes? Three years ago, I purchased a 4-day classroom Kubernetes Administration course (LFS458) from FastLane. It was not…

76 comments on “Linux Root Terminal on vocon Cloud – How to save your Image and re-launch a Container based on that Image”

Linux Root Terminal on vocon Cloud – How to save your Image and re-launch a Container based on that Image

This blog post shows how you can run and manage your Docker images on vocon Cloud Desktop. We will launch an Ubuntu container, install git software as a root user and create and save the resulting Docker image on Docker…

185 comments on “Creating a StoryBook Hello World @ NextJS with the help of OpenAI based on ChatGPT – Part 1: chatting and creating a new Next.js app”

Creating a StoryBook Hello World @ NextJS with the help of OpenAI based on ChatGPT – Part 1: chatting and creating a new Next.js app

Do we still need blogs, if there is ChatGPT around? I will test the OpenAI version of ChatGPT. In the long run, we intend to create a NextJS Hello World program with StoryBook. In this part, we will start chatting…

65 comments on “Kubernetes Task: assign a POD to a Node via Node Affinity – Cheat Sheet”

Kubernetes Task: assign a POD to a Node via Node Affinity – Cheat Sheet

Here, we show as shortly as possible how we can place a POD on the controlplane node on killerkoda CKA playground: Task: place a POD on the controlplane POD using Affinity Find documentation: kubernetes.io --> Documentation --> Search "affinity" -->…

72 comments on “Kubernetes etcd backup and restore – cheat sheet”

Kubernetes etcd backup and restore – cheat sheet

This is a cheat sheet on how to perform backup&restore of the etcd server in kubernetes quickly. Test this on Killercoda Play with Kubernetes tl;dr Find reference: https://kubernetes.io --> Documentation --> Search "etcd backup restore" --> you will find: Operating etcd…

61 comments on “Cheat Sheet: Install non-privileged podman v3 in a CentOS 7 Container”

Cheat Sheet: Install non-privileged podman v3 in a CentOS 7 Container

See how you can run a user space podman container inside another non-privileged container. For that, we create a CentOS 7 image with podman v3 installed. We spin up a Kubernetes non-privileged container from this image, and we show that…

72 comments on “How to enter a root shell session to a container without Docker – replace ‚docker exec‘ by ‚runc‘”

How to enter a root shell session to a container without Docker – replace ‚docker exec‘ by ‚runc‘

The latest version of Kubernetes does not support Docker as a container runtime anymore. That is why many Kubernetes administrators have migrated their cluster's container runtime from docker to another container runtime like containerd or cri-o. Or they will do…

70 comments on “[SOLVED] WebStorm@CentOS Bug: Could not initialize class com.intellij.javascript.debugger.console.jcef.JCE”

[SOLVED] WebStorm@CentOS Bug: Could not initialize class com.intellij.javascript.debugger.console.jcef.JCE

Do you know the following Error message? Error running 'Angular Application' # <- the name of the Debug Profile might be named differently in your case Could not initialize class com.intellij.javascript.debugger.console.jcef.JCE This happened to us on our WebStorm Cloud Desktop…

62 comments on “Migrate Kubernetes Runtime from Docker to containerd”

Migrate Kubernetes Runtime from Docker to containerd

Migration of the kubeadm-based Kubernetes from Docker to containerd should be easy. In my case, it wasn't. Wrong information found on the Internet combined with the incompatibility of the used Kubernetes and containerd versions has caused major problems. Fortunately, I…

52 comments on “WebStorm Cloud Desktop – the Best Javascript IDE in the Browser”

WebStorm Cloud Desktop – the Best Javascript IDE in the Browser

WebStorm Cloud Desktop is now available as an installation-free application that runs in your browser. It provides you with JetBrains' well-known integrated JavaScript development environment with additional CPU and RAM and high internet speed. With the arrival of WebStorm Cloud…

43 comments on “IntelliJ Cloud Desktop – Instant free Remote Session with no Time Limit”

IntelliJ Cloud Desktop – Instant free Remote Session with no Time Limit

IntelliJ Cloud Desktop by vocon IT GmbH is available as a free beta version on https://intellij-frontend.vocon-it.com/. Just register via GitHub or Google, and you are ready to start coding on IntelliJ Cloud Desktop in less than a minute. NEW (2021-11-26):…

20 comments on “Setting a Breakpoint for Debugging Spring Boot CORS Problems in IntelliJ IDEA (Cheat Sheet)”

Setting a Breakpoint for Debugging Spring Boot CORS Problems in IntelliJ IDEA (Cheat Sheet)

Super-short instructions how to place the breakpoint in an IDE in order to debug CORS issues in Spring Boot. The problem with debugging CORS (like any other filter in spring boot security) is, that any request is blocked before they…