Challenges | iximiuz Labs

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Official Collection

Challenges crafted by iximiuz Labs to help you master DevOps and Server Side topics.

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

Challenge, Easy, on Containers

Docker 101: Pull a Container Image by Digest

by Ivan Velichko

Practice pulling a container image using an immutable digest reference instead of a mutable tag.

container-image docker container-registry containers-101

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

Challenge, Easy, on Containers

Docker 101: Pull Container Images from Different Registries

by Ivan Velichko

Pull container images using the 'docker pull' command and explore how the image name determines its source registry and repository.

container-image docker container-registry containers-101

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

Challenge, Easy, on Linux

Run an ARM64 Binary on an AMD64 Machine Using QEMU Emulation

by Ivan Velichko

Learn how Linux's binfmt_misc mechanism and QEMU user-space emulation allow transparent execution of binaries compiled for foreign CPU architectures.

emulation qemu multi-platform

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

Challenge, Easy, on Containers, Programming

Write a Dockerfile That Excludes Dev Dependencies from the Production Image

by Ivan Velichko

Learn how to keep your container images lean by excluding development dependencies (linters, test frameworks, etc.) from the production build.

docker container-image containers-101 dockerfile node.js

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Independent Authors

Challenges from outstanding independent authors proudly hosted by iximiuz Labs.

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

Challenge, Easy, on Linux, Programming

eBPF Challenge for Beginners

by Teodor Janez Podobnik

In this challenge, you’ll debug and fix a deliberately “broken” eBPF program, then prove it’s running by identifying its program and map IDs. Along the way, you’ll explore bpftool, check which helpers are supported, and dig into details like the UID of the loader. Finally, you’ll test your knowledge of eBPF maps by recalling the flag that only inserts a key if it doesn’t already exist.

eBPF

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

Challenge, Easy, on CI/CD, Security

Dagger: Working with Secrets

by Márk Sági-Kazár

Get hands-on with reading secrets from different providers and using them in your Dagger pipelines.

dagger

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

Challenge, Easy, on CI/CD

Dagger: Module Dependencies

by Márk Sági-Kazár

Learn how to install, update and uninstall Dagger module dependencies.

dagger

Community Collection

Challenges contributed by the community members sharing their knowledge and expertise.

This challenge was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Challenge, Easy, on Kubernetes

Resolve OOMKilled Errors by Reading VPA Memory Recommendations

by Omkar Shelke

Troubleshoot a Deployment where containers are repeatedly OOMKilled. Inspect Vertical Pod Autoscaler (VPA) recommendations and manually apply the recommended memory request and memory limit to stabilize the workload.

cka vpa resources oomkilled deployment

This challenge was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Challenge, Easy, on Linux

The SED command : Survival Guide - What You Must Know

by Lotfi Hamadene

Master **sed**, the essential stream editor for Linux SysAdmins. Progress through 10 tasks: simple & global substitution, regex patterns, line ranges, deletion, insertion, ... Work with realistic Rocky Linux system files in /home/laborant/sed_challenge/.

sed text-processing stream-editor rhcsa

This challenge was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Challenge, Easy, on Kubernetes

Kubernetes Pod Lifecycle Fundamentals

by Adithya G

Practice the fundamental lifecycle of a Kubernetes Pod: creation, inspection (IP, node), interaction (executing commands, checking logs), and deletion.

kubernetes-101 pods kubectl

This challenge was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Challenge, Easy, on Kubernetes

CKA Practice: Upgrade Multi-Node Kubernetes Cluster

by Adam Leskis

This exercise tests your ability to safely upgrade a multi-node Kubernetes cluster from version 1.30 to 1.31 following the standard upgrade procedure.

cka

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