Master Server-Side Technologies
by Doing

A hands-on learning platform for Linux, Docker, Kubernetes, and Networking

Practice on real servers, solve challenges, and follow guided Linux, Docker, Kubernetes, and Networking learning paths — all from your browser or via SSH.

labctl playground start docker

Spinning up a fresh Docker host... Ready!

root@vm:~$

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Featured Roadmap

Master Docker
from Zero to Hero

Follow a comprehensive roadmap that combines practical challenges with focused theory and vibrant diagrams. Start with the basics, work through must-have topics, and go deeper when you're ready.

Structured progression from basics to advanced
Hands-on challenges with automated checking
Theory, diagrams, and practical exercises combined

Explore the Docker Roadmap

Hands-on Challenges

Prepare for Interviews.
Build Real Skills.

Solve focused, bite-sized problems to gain practical Linux, Docker, Kubernetes, and Networking skills — from easy warm-ups to hard troubleshooting-style scenarios.

Realistic server environments
Automated step-by-step checks
Hints when you're stuck
Editorial solutions included

Challenges
to solve

334

Solutions
attempted

103.8K

Solutions
accepted

66.0K

Difficulty

Easy Medium Hard

Assemble and Publish a Multi-Platform Image from Single-Platform Variants

#docker #container-image #container-registry #multi-platform #oci-image

This challenge was carefully crafted by an independent author and proudly hosted by iximiuz Labs.

Challenge on Kubernetes

Kube Mysteries: The Invisible Pod

#kubelet #pod

This challenge was prepared for you by the iximiuz Labs team.

Challenge on Containers, Linux

Free Up Disk Space by Removing Unused Docker Volumes

#docker #container-volume #filesystem

This challenge was prepared for you by the iximiuz Labs team.

Challenge on Containers

Docker 101: Authenticate to Private Container Registries

#container-registry #container-image #docker #containers-101

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Tutorials & Courses

Dive into Linux, Networking,
Docker and Kubernetes

Deep, illustrated articles with reproducible steps, or structured courses with guided exercises and practical assignments. Every tutorial and lesson comes with an attached playground — try commands right in your browser, no extra setup required.

Interactive content with embedded playgrounds
Run commands directly in web terminals or via SSH
Courses with step-by-step guided exercises

Interactive tutorial with embedded terminal

This tutorial was carefully crafted by an independent author and proudly hosted by iximiuz Labs.

Tutorial on Networking, Observability

Transparent Egress Proxy with eBPF and Envoy

by Teodor Janez Podobnik

This lab teaches you how to use eBPF to transparently intercept and redirect a client's outgoing traffic to an Envoy proxy without requiring any changes to the application code. You will build a system that recovers original connection metadata via socket-level hooks and uses SO_MARK to prevent infinite routing loops, replacing traditional, complex iptables rules with a high-performance eBPF alternative.

#eBPF

This tutorial was carefully crafted by an independent author and proudly hosted by iximiuz Labs.

Tutorial on Linux, Programming

Why Does My eBPF Program Work on One Kernel but Fail on Another?

by Teodor Janez Podobnik

In this tutorial, we look at why eBPF programs can fail across kernel versions due to changes in structs, tracepoints, and function layouts. We look at examples of how these differences cause portability issues and how BPF CO-RE, BTF and vmlinux.h address them.

#eBPF

This course was prepared for you by the iximiuz Labs team.

Course on Networking, Linux

Computer Networking Fundamentals For Developers, DevOps, and Platform Engineers

by Ivan Velichko

A heavily illustrated introduction to the first two layers of Computer Networking: Ethernet and IP. A must for any developer or DevOps engineer who wants to build solid understanding of computer networking before they move to the higher-level protocols like TCP, UDP, and even HTTP.

Computer Networking Fundamentals For Developers, DevOps, and Platform Engineers (cover image)

#ethernet #ip #switch

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Playgrounds

Experiment Freely
in Safe Sandboxes

Spin up vanilla Linux VMs, fresh Docker hosts, or Kubernetes clusters in seconds. Access playgrounds via browser terminal or SSH and experiment without fear of breaking anything.

Provisioned in seconds, not minutes
Browser terminal and SSH access
Multi-VM setups with custom configurations
Preserve your progress with persistent drives