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

345

Solutions
attempted

106.6K

Solutions
accepted

68.0K

Difficulty

Easy Medium Hard

Classic Sysadmin Task: Which Process Is Listening on a Port?

#investigation #socket #tcp #os-process

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

Challenge on Linux, Networking

Identify the Source of Unexpected Requests in an On-Prem Network

#ip #dns #investigation

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

Challenge on Linux, Containers, Networking

Create a Linux Network Namespace

#container-networking #netns #nsenter #unshare #ip

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

Challenge on Containers, Linux

Run a Sidecar Container in the Namespace of Another Container

#docker #container-runtime #namespaces #debugging

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 Linux, Networking

Building an eBPF/XDP L2 Direct Server Return Load Balancer from Scratch

by Teodor Janez Podobnik

In this tutorial, you will learn how to build an Layer 2 DSR load balancer using eBPF/XDP, where backends send responses directly back to clients bypassing the load balancer.

#eBPF

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

Tutorial on Containers

How Container Images Actually Work: Layers, Configs, Manifests, Indexes, and More

by Ivan Velichko

A practical deep dive into container image internals that will help you build a clear mental model of how images are composed, identified, stored, and distributed across registries.

How Container Images Actually Work: Layers, Configs, Manifests, Indexes, and More (cover image)

#container-image #oci-image #docker

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

Course on Security, Kubernetes

Software Bill of Behavior - vendor supplied runtime profile for tampering and anomaly detection

by Constanze Roedig

We ♥️ supply chain security, thus was created SBOM - the Bill of Materials- but, we also need SBOB -the Bill of Behavior - This livelab proposes to standardize how to record a benign behavior profile, extract, sign and publish it, for users to consume, ingest, verify it and detect attacks and tampering. For software-vendors, a SBOB creates trust and transparency, For users, it makes anomaly detection realistically achievable.

#supplychain #anomaly #behaviour

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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