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.

Execute Host Commands Inside a Running Container

Leverage your knowledge of Linux namespaces to reach an application's internal debug interface without installing anything into the container.

docker debugging distroless nsenter

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

Challenge, Medium, on Containers, Linux

Run a Sidecar Container in the Namespace of Another Container

by Ivan Velichko

Learn how to run multiple Docker containers sharing the same PID, IPC, and network namespaces - a foundation of many advanced container use cases, including Kubernetes Pods construction and container debugging tools.

docker container-runtime namespaces debugging

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

Challenge, Easy, on Linux

Pause and Resume Linux Processes with cgroup Freezer

by Ivan Velichko

Practice pausing (freeze) and resuming (thaw) a resource-hungry Linux process using the cgroup v2 freezer mechanism.

cgroups

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

Challenge, Easy, on Containers, Linux

Docker 101: Signal a Running Containerized Application

by Ivan Velichko

Practice using UNIX signals with containers for controlling application behavior: Send a SIGUSR1 to a containerized app to trigger its memory usage reporting.

docker containers-101 container-runtime os-signal

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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

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 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, Medium, on Linux, Observability

AWK Mastery: From Zero to Hero

by Lotfi Hamadene

3-phase AWK challenge on realistic data in /home/laborant/awk_challenge/. Fundamentals: columns, delimiters, formatting. Logic & regex: filters, anchors, conditions, math. Sysadmin: logs, CSVs, metrics, counts, reports. Data lives under /home/laborant/awk_challenge/ (logs/access, data/hr, sys/metrics) and outputs are written to /home/laborant/ files.

awk scripting text-processing rhcsa