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:~$

Start for Free

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

350

Solutions
attempted

108.1K

Solutions
accepted

69.1K

Difficulty

Easy Medium Hard

Make a Container Restart Automatically After Podman Host Reboot

#podman #containers-101 #container-runtime

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

Challenge on Linux, Containers, Networking

Network Access to a Container Started by ctr

#containerd #ctr #docker

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

Challenge on Containers

Docker 101: Restart an Application Container on Failure Automatically

#docker #containers-101 #container-runtime

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

Challenge on Linux, Containers, Networking

Reproduce a Docker Bridge Network Using Basic Linux Commands

#container-networking #netns #bridge #nat #ip

Browse All Challenges

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 Linux, Programming

Storing Data in eBPF: Your First eBPF Map

by Teodor Janez Podobnik

In this tutorial, you’ll learn how to store and update data inside the kernel, turning a simple eBPF Hello World program into one that tracks useful state. We’ll also briefly learn a few basics of bpftool, a handy CLI tool that will allow us to list and inspect our eBPF map.

#eBPF

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

Course on Containers

How (and Why) to Use containerd from the Command Line

by Ivan Velichko

Explore containerd with ctr, its default command-line client, try nerdctl as a potential Docker alternative, and learn how to debug Kubernetes Pods with crictl.

How (and Why) to Use containerd from the Command Line (cover image)

#containerd #ctr #nerdctl

Browse Tutorials Browse Courses

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