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

349

Solutions
attempted

107.2K

Solutions
accepted

68.4K

Difficulty

Easy Medium Hard

Tag and Push Container Images Using ctr

#container-image #container-registry #containerd #ctr

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

Challenge on Containers, Networking, Security

Restrict Access to a Docker-Published Port with Firewall Rules

#docker #container-networking #routing #firewall #iptables

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

Challenge on Containers

Docker 101: Pause and Unpause a Containerized Application

#docker #containers-101 #container-runtime #cgroups

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

Challenge on Containers, Programming

Build a Production-Ready Node.js Container Image: SvelteKit Application

#docker #container-image #dockerfile #node.js

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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 Containers, Linux

Docker Run, Attach, and Exec: How They Work Under the Hood (and Why It Matters)

by Ivan Velichko

Dive into the internals of the Docker run, attach, and exec commands by following this highly visual and hands-on tutorial.

Docker Run, Attach, and Exec: How They Work Under the Hood (and Why It Matters) (cover image)

#containers-101 #docker #tty

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

Tutorial on Linux, Programming

All The Ways To Loop and Iterate in eBPF

by Teodor Janez Podobnik

In this tutorial you will learn different ways to implement loops in eBPF, explaining how iteration evolved from manual loop unrolling to modern mechanisms like bounded loops, helper functions, and open-coded iterators. It walks through the limitations, kernel version requirements, and practical examples for each approach so you can choose the most appropriate looping method for your eBPF programs.

#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