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

176

Solutions attempted

53.6K

Solutions accepted

30.9K

Difficulty

Easy Medium Hard

Docker 101: Run Your First Containers

docker containers-101 container-runtime

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

Challenge, Easy, on Containers

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, Easy, on Containers

Label a Container Image Using ctr

container-image containerd ctr

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

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

Tutorial on CI/CD, Kubernetes

Testing and Releasing Helm Charts with Dagger

by Márk Sági-Kazár

Learn how to test, package and release Helm charts using Dagger.

Testing and Releasing Helm Charts with Dagger (cover image)

dagger helm ci-pipeline

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

Tutorial on Kubernetes, Containers

Making Sense Out of Native Sidecar Containers in Kubernetes

by Ivan Velichko

Understand the "native" sidecar containers, learn their difference from regular and init containers and discover their advantages in this focused and highly practical tutorial.

Making Sense Out of Native Sidecar Containers in Kubernetes (cover image)

sidecar init-container

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

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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