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

180

Solutions attempted

54.0K

Solutions accepted

31.1K

Difficulty

Easy Medium Hard

Docker 101: Run a Containerized CLI Tool and Send Data to Its STDIN

docker containers-101 container-runtime

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

Challenge, Medium, on Kubernetes, Containers

Send a Signal to a Kubernetes App: a Slim Container Case

ephemeral-container debugging slim-image distroless

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

Challenge, Easy, on Linux, Networking

Classic Sysadmin Task: Which Port Is a Service Listening On?

socket tcp os-process

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

Challenge, Easy, on Containers

Start and Inspect a Container With Podman

podman container-runtime 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 prepared for you by the iximiuz Labs team.

Tutorial on Containers

How To Extract Container Image Filesystem Using Docker

by Ivan Velichko

How to explore the filesystem of a container image using nothing but the standard Docker means (and without running any containers).

How To Extract Container Image Filesystem Using Docker (cover image)

container-image debugging docker

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

Tutorial on Containers

Docker Container Commands Explained: Understand, Don't Memorize

by Ivan Velichko

When you are new to Docker, the number of commands to study might be truly overwhelming. This tutorial shows a way to internalize the most important Docker commands without the brute-force memorization.

Docker Container Commands Explained: Understand, Don't Memorize (cover image)

containers-101 docker container-runtime

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

Course on Kubernetes

Kubernetes the (Very) Hard Way

by Márk Sági-Kazár

A hands-on, step-by-step guide to assembling a Kubernetes cluster from the ground up, (without using any automation) while deeply exploring each component's role and functionality along the way.

Kubernetes the (Very) Hard Way (cover image)

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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