Learn Kubernetes weekly — issue 6

21 Dec 2022

It's a very slow week as it's almost Christmas time! 🎅🤶

Merry Christmas from the team at Learnk8s and myself!

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Articles

Scaling Kubernetes to thousands of CRDs
Nic Cope
In this post, you'll explore the limitations of running too many CRDs in your cluster and you could overcome them. Noteworthy:
- Each CRD uses ~4MB of memory.
- It takes 20 seconds for kubectl to discover the API with 300 API groups.
Kubernetes-in-Kubernetes and the WEDOS PXE bootable server farm
Andrei Kvapil
Learn how you can simplify the management of data centers, thousands of physical servers, virtual machines and hosting for hundreds of thousands of sites with Kubernetes-in-Kubernetes (nested Kubernetes clusters).
How did we upgrade our EKS clusters from 1.15 to 1.22 without Kubernetes knowledge?
Safaa AlNabulsi
In this case study, you'll learn how the team at AutoScout24 inherited an EKS cluster with almost 700 services and migrated it from version 1.15 to 1.22 without any prior knowledge of Kubernetes.
Kubernetes driver for Docker buildx
Akihiro Suda
In this article, you will learn how Docker BuildX supports building images using BuildKit pods on a Kubernetes cluster.
Top kubectl plugins
Robusta.dev
This blog article cover 6 popular kubectl plugins:
1. kubectx & kubens
2. Ingress-nginx
3. Cert-manager
4. Popeye
5. Kyverno
6. kubectl-explore
Deploy with kustomize, fluxcd and remote resources
Davin Kevin
Kustomize provides a mechanism to fetch remote resources (using git under the hood).
This article will teach you how to use Kustomize and remote resources in FluxCD.

GitOps fundamentals
Codefresh University
In this course, you will learn the basics of GitOps with ArgoCD and Argo Rollouts.
Evaluating and improving the performance of your ingress controller
Ali Mukadam
In this article, you'll learn how to deploy the nginx-ingress, generate load using locust and capture the generated metrics.
You'll then analyse them using Grafana, identify potential latency issues, and discuss how to mitigate them.
Implement distributed tracing with Jaeger & Open Telemetry on Kubernetes
Akash Jaiswal
In this article, you'll learn how to implement distributed tracing for your apps running on Kubernetes using Open Telemetry & Jaeger.

- DevOps Engineer with BrickBite
- Salary: €50K to €70K a year
- Location: remote from Germany
- Tech stack: Kubernetes, On-premise, Gitlab, Ansible, Prometheus
- DevOps Engineer with WealthKernel
- Salary: $60K to $70K a year
- Location: remote from the United Kingdom
- Tech stack: Kubernetes, Azure, GCP, C#, Go, Python, Terraform

kinvolk/inspektor-gadget
Inspektor Gadget is a collection of tools to debug and inspect Kubernetes resources and apps.
It manages the packaging, deployment and execution of eBPF programs and it automatically maps low-level kernel primitives to high-level Kubernetes resources.
containers/oci-seccomp-bpf-hook
This project provides an OCI hook to generate seccomp profiles by tracing the syscalls made by the container.
The generated profile would allow all the syscalls made and deny every other syscall.
helmfile/helmfile
Helmfile is a declarative specification for deploying Helm charts.
It lets you:
- Keep a directory of chart value files and maintain changes in version control.
- Apply CI/CD to configuration changes.
- Periodically sync to avoid skew in environments.
keyval-dev/odigos
Odigos is an open-source observability control plane that allows developers to easily create and build their observability pipelines by abstracting away the complexities of technologies such as eBPF and OpenTelemetry.
deluxeowl/subdomain-mapper-operator
This operator patches an ingress to automatically create subdomains for services based on annotations.