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

306

Solutions attempted

92.9K

Solutions accepted

58.0K

Difficulty

Easy Medium Hard

Build and Publish a Container Image With Docker

#docker #container-image #dockerfile #containers-101 #container-registry

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

Challenge, Easy, on Containers, Linux

Install Docker Engine on Fedora

#fedora #docker #containerd #runc

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

Challenge, Medium, on Kubernetes, Containers

Kubernetes Pod With a Faulty Init Sequence

#sidecar #init-container

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

Challenge, Medium, on Linux, Containers, Networking

Connect Two Network Namespaces

#container-networking #netns #veth #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 carefully crafted by an independent author and proudly hosted by iximiuz Labs.

Tutorial on Networking, Observability

Accelerating Transparent Ingress Proxy with eBPF and Envoy

by Teodor Janez Podobnik

This lab teaches you how to use eBPF socket acceleration to speed up communication between processes on localhost and optimize a transparent Envoy proxy setup. You will implement techniques that bypass parts of the kernel networking stack, allowing data to be transferred more directly between sockets to improve throughput and reduce latency.

#eBPF

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

Tutorial on Containers

How to Build Smaller Container Images: Docker Multi-Stage Builds

by Ivan Velichko

Learn how to build smaller, more secure Docker container images using Multi-Stage Builds. This guide explains common sources of image bloat, best practices for slimming down production images, and practical examples for Node.js, Go, Rust, and other application stacks. Start optimizing your containers today!

How to Build Smaller Container Images: Docker Multi-Stage Builds (cover image)

#docker #container-image #dockerfile

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

Course on CI/CD, Containers

An Alternative Introduction to Dagger: Understanding the Core Concepts

by Ivan Velichko

Build a mental model of how Dagger works by migrating an example software project from traditional script-based automation to a Dagger-powered development workflow, peeking under the hood of the new technology on the way.

An Alternative Introduction to Dagger: Understanding the Core Concepts (cover image)

#dagger #devops #ci-pipeline

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