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

Build a Production-Ready Python Container Image: FastAPI Application

docker container-image dockerfile python

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

Challenge, Easy, on Containers, Kubernetes

Copy Files To/From a Running Kubernetes Pod: a Simple Case

kubernetes-101 kubectl debugging

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

Challenge, Easy, on Containers

Edit a File in a Running Container: a Simple Case

containers-101 debugging docker

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

Challenge, Medium, on Linux, Containers, Networking

Set Up Network Address Translation (NAT) for a Container

container-networking netns iptables nat ip

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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 Linux, Containers

How Container Filesystem Works: Building a Docker-like Container From Scratch

by Ivan Velichko

Learn how Linux containers are built from the ground up. Starting with the mount namespace and a root filesystem, see why PID, cgroup, UTS, and network namespaces naturally follow - and how this foundation makes concepts like bind mounts, volumes, and persistence in Docker or Kubernetes much easier to grasp.

How Container Filesystem Works: Building a Docker-like Container From Scratch (cover image)

container-runtime docker container-rootfs

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 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

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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