Building a Docker-like Container From Scratch 🛠️ Learn about the key Linux namespaces by assembling a tiny but realistic container using only stock Linux commands: unshare, mount, and pivot_root. No runtime magic and (almost) no cut corners. labs.iximiuz.com/tutorials/c…

iximiuz Labs gift cards and team access are out! If you want to get premium access to iximiuz Labs for your friend or your entire team (as a manager, I hope), it's now just a couple of clicks away. And the gift cards even look decent.

Finally, the first Shell Gym learning path I'm more or less happy with: "Meet the Linux Shell" github.com/iximiuz/shellgym/…. It's almost entirely AI-generated, but the prompt was 4,000 lines long, so I'm inclined to claim the authorship. Already loaded into the Shell Gym playground.

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 🤷‍♂️ grahamhelton.com/blog/nodes-… 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: labs.iximiuz.com/tutorials/n… 💙 We definitely need more security researchers publishing exploit reproductions as code labs anyone can run and verify!

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! 💪