Peter Rossbach

System Architect, Docker & Kubernetes Influencer Cloud Native Engineer, DevOps, Infra Coder, Apache Tomcat Committer, Apache Member, Entrepreneur, Unicycler

[Kube Architect @K8sArchitect]

This article explains how ListenerSet in Gateway API v1.5 separates listeners from Gateways so teams can restore self-service TLS management across namespaces and scale beyond the old listener limit

➤ https://t.co/uIjsaqL7NL

[Akihiro Suda (@[email protected]) @_AkihiroSuda_]

Wrote a blog: Improvements to Rootless mode in Docker v29.5

https://t.co/8cbGXw8pKM

- Faster image pulling and pushing
- Support for `docker run --net=host`
- Support for localhost registries
- Source IP propagation without the legacy slirp4netns dependency

[Kube Architect @K8sArchitect]

Helm CEL is a Helm plugin that leverages Common Expression Language (CEL) to validate values, offering a more expressive and flexible alternative to traditional JSON Schema validation

➜ https://t.co/RecSHjzHsb

[Kube Builders @KubeBuilders]

k8s-bootstrap generates GitOps-ready Kubernetes cluster configurations through a web UI where you select components such as ingress controllers, security tools, and observability platforms

➜ https://t.co/OT7KIB5gzu

[LearnKube @learnk8s]

zot is a production-ready vendor-neutral OCI image registry - images stored in OCI image format, distribution specification on-the-wire

➤ https://t.co/n5EsZhwhYH

[Bilgin Ibryam @bibryam]

How etcd works with and without Kubernetes
https://t.co/IOiPxNEpUi

[LearnKube @learnk8s]

Uncloud is a lightweight clustering tool that deploys and manages containerized applications across Docker hosts using Docker Compose syntax

➜ https://t.co/H5TXnkuZN7

[Ivan Velichko @iximiuz]

Graham Helton has just published a disclosure of a Kubernetes vulnerability that allows running arbitrary commands in any pod in a cluster using a common "read-only" RBAC permission. And this vulnerability won't be assigned a CVE, meaning Kubernetes won't receive a fix 🤷‍♂️

https://t.co/vQsbf8U3wR

But there is a silver lining. Graham prepared a short auxiliary post that focuses specifically on the reproduction, and it's an iximiuz Labs tutorial: https://t.co/Zze2ybpkXP 💙

We definitely need more security researchers publishing exploit reproductions as code labs anyone can run and verify!

[LearnKube @learnk8s]

This article reveals hard-earned lessons on using Kubernetes Informers in large clusters, explaining informer fundamentals, handler design pitfalls, caching, memory optimization, and workqueue best practices for scalable controller code

➤ https://t.co/zwNAWQvpVE

[Ivan Velichko @iximiuz]

2025 year wrap-up for iximiuz Labs 🚀

- 21K+ new users (12K in 2024)
- ~160K VMs fired up (x2 YoY)
- 31K challenge submissions, 18K accepted
- 830 playgrounds created
- First net-positive year after ~3 years of bootstrapping

Biggest features 🛠️
- Playgrounds 2.0 (multi-VM, multi-network, multi-disk, custom rootfs, kernel switcher)
- Persistent playgrounds + instant clones
- Coding-agent base playground
- Markdown and YAML-powered, shareable playgrounds
- Faster boots via SSH-over-VSOCK
- Bigger & more reliable infra (AP region x3, EU region gets better servers)

Content in 2025 📚
- 20+ tutorials (incl. a 5k-word deep dive on container filesystems)
- ~40 public challenges (+50 private)
- Hands-on Docker Roadmap launched
- 7 skill paths (containers + eBPF)
- ~50 trainer-led events, incl. 4 real-world university courses

Business 📈
- $185K revenue in 2025
- ~3,000 Premium members
- ~2,000 lifetime Premiums
- Premium got cheaper (VAT-incl + PPP discounts)

2026 focus: content, content, content 🤓
- Finish Docker Roadmap
- Two hands-on Kubernetes roadmaps
- More networking fundamentals
- Better content discovery, author profiles, creator monetization

Looking back at what shipped in 2025, I'm convinced we've built enough momentum to make 2026 a truly exceptional year for the platform! 💪

[Mohit Mishra @chessMan786]

Inside the Linux Kernel: The Art of Linux Kernel Compilation and Booting
An in-depth guide to Linux kernel compilation and the boot process, exploring kernel configuration, build systems, and the intricate steps from bootloader to running system.

[GitHub Projects Community @GithubProjects]

Scale your storage needs with a simple, self-hosted s3 alternative

[Markus Eisele @myfear]

#Kubernetes for #Java Developers: The Ultimate Quarkus + Minikube Quick Reference https://t.co/PVV9fy7MU3

[Kubetools @kubetools]

GitHub - openkube-hub/KubeUser: Kubernetes-native user management operator

Lightweight Kubernetes-native user management operator that simplifies user authentication and authorization through declarative custom resources. https://t.co/VrsQ1tHO7k

[Sidero Labs, Inc. @SideroLabs]

More home lab inspiration for you today. This one is using Flux and Rook.

Check it out ➡️ https://t.co/7aLgZ1fZDW

[Clandestine @akaclandestine]

GitHub - cr0hn/dockerscan: The Most Comprehensive Docker Security Scanner https://t.co/ZYyBvnuJt2

[Kube Builders @KubeBuilders]

This project provides tools and code to build OCI-compatible container images directly inside Kubernetes clusters and containerized environments, without requiring a Docker daemon

➜ https://t.co/8H0P97GVk5

[Sági-Kazár Márk @sagikazarmark]

Iximiuz Labs subscription is now on sale with a 70% discount.

It's essentially the price of a coffee per month.

If you're looking to enhance your skills in containers or networking, you won't find a better investment than this.

[Ivan Velichko @iximiuz]

Docker Hands-On: Pass Environment Variables to Containers 🛠️

A container is an isolated and restricted "box" that runs your application. By definition, this means the env vars you set in your terminal won't be visible to the containerized app.

Practice: https://t.co/gBPe6DdmzU

[Ivan Velichko @iximiuz]

Persistent Playgrounds on iximiuz Labs 🚀

A video demo for now, and the release is on its way to production servers. It's a massive upgrade, but I'm hoping to be done with it by ~tomorrow afternoon🤞