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

282

Solutions attempted

81.6K

Solutions accepted

50.0K

Difficulty

Easy Medium Hard

Connect Multiple Network Namespaces

container-networking netns veth bridge ip

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

Challenge, Medium, on Linux

Extract a tar Archive with Permissions, Ownership, and Extended Attributes Preserved

tar

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

Challenge, Medium, on Containers, Security

Install a Private npm Package in a Dockerfile Without Leaking Credentials

docker dockerfile secrets node.js

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

Challenge, Hard, on Networking, Linux

Restrict SSH Bastion Access by User Role

ssh tunnel port-forwarding bastion

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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 prepared for you by the iximiuz Labs team.

Tutorial on Security, Observability

Exploring Tetragon - A Security Observability Tool for Kubernetes, Docker, and Linux

by Ivan Velichko

What is Tetragon, how it works, and how to use it to detect and react to security-significant events in your Kubernetes, Docker, or plain Linux environment.

Exploring Tetragon - A Security Observability Tool for Kubernetes, Docker, and Linux (cover image)

ebpf tracing security-policy

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

Tutorial on Linux, Programming

eBPF Tracepoints, Kprobes, or Fprobes: Which One Should You Choose?

by Teodor Janez Podobnik

In this tutorial, we’ll look at how different eBPF tracing mechanisms work in practice by focusing on a single use case: capturing execve system call events. We’ll start with tracepoints, move on to raw tracepoints, and then cover kprobes and fprobes, showing how each attaches to the kernel and what data they expose. Along the way, we’ll compare their trade-offs in terms of stability, performance, and portability.

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