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

345

Solutions
attempted

106.3K

Solutions
accepted

67.7K

Difficulty

Easy Medium Hard

Docker 101: Run a Container in Background, Read Logs, and Attach

#docker #containers-101 #container-runtime

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

Challenge on Linux

Make a Filesystem Mount Survive a Reboot

#storage #mount #filesystem #fstab #systemd

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

Challenge on Containers, Linux

Run a Sidecar Container in the Namespace of Another Container

#docker #container-runtime #namespaces #debugging

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

Challenge on Security, Linux, Containers

A Simple Sandbox Breakout: Spot It and Stop It

#docker #sandbox #firewall #firecracker #microvm

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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, Networking, Linux

How Container Networking Works: Building a Bridge Network From Scratch

by Ivan Velichko

Begin with the basics to understand Docker and Kubernetes networking: learn how to create and interconnect Linux network namespaces using only command-line tools.

How Container Networking Works: Building a Bridge Network From Scratch (cover image)

#container-networking #netns #bridge

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 course was prepared for you by the iximiuz Labs team.

Course on Linux, Containers, Security

Hands-On Firecracker: microVMs From First Principles to Production

by Ivan Velichko

A hands-on introduction to Firecracker that takes you from booting your first microVM to building secure, production-ready sandbox infrastructure. Learn how to launch and control microVMs, wire up networking, share data efficiently, and harden execution - the essential skills for running autonomous agents and untrusted workloads safely at scale.

#firecracker #kvm #vmm

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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