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

Docker 101: Publish a PostgreSQL Container Port on Localhost Only

#docker #containers-101 #container-networking #port-forwarding

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

Challenge on Linux

Mount an Existing Directory at a New Location (bind mount)

#storage #mount #filesystem

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

Challenge on Kubernetes, Containers, Networking

What Port Does This Kubernetes Pod Listen On?

#kubectl #kubectl-debug #investigation #socket #ss

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

Challenge on Linux, Containers, Networking

Network Access to a Container Started by ctr

#containerd #ctr #docker

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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

What Is a Standard Container: Diving Into the OCI Runtime Spec

by Ivan Velichko

Are all containers just Linux processes? How does the OCI runtime specification define a container? What platforms do OCI containers support? What is a Docker container? Linux containers vs. Virtual Machine containers.

What Is a Standard Container: Diving Into the OCI Runtime Spec (cover image)

#oci-runtime #docker #namespaces

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 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