Challenge, Medium, on
Start a systemd Service on the First Connection (TCP Socket Edition)
Configure systemd to keep a TCP port open at all times while starting the backing service process only when the first connection arrives.
Challenges
Focused hands-on problems designed to help you hone your DevOps or Server Side skills. Some challenges are more educational, while others are based on real-world scenarios. The platform provides hints and feedback for each challenge, including automated solution checks.
Official Collection
Challenges crafted by iximiuz Labs to help you master DevOps and Server Side topics.
Challenge, Medium, on
Start a systemd Service on the First Connection (Unix Socket Edition)
Configure systemd to keep a Unix domain socket open at all times while starting the backing service process only when the first connection arrives.
Submissions: 35/50
Make One Echo Server Work with Both TCP and Unix Sockets
Make a single echo server listen on either a TCP socket or a Unix domain socket, selected by its command-line argument. The challenge illustrates that the same stream-socket workflow works with two address families (AF_INET and AF_UNIX).
Submissions: 14/30
Write a TCP Client for a Chat Server
Write a TCP client to hold a back-and-forth conversation with a "chat" server: send a line, read the reply, send another line - repeat until the session is over. A hands-on lesson in designing an application protocol on top of a byte-oriented TCP stream.
Independent Authors
Challenges from outstanding independent authors proudly hosted by iximiuz Labs.
Challenge, Hard, on
Kube Mysteries: The Invisible Pod
Did you know that pods can become invisible? Can you figure out how?
eBPF Challenge for Beginners
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.
Submissions: 130/406
Dagger: Working with Secrets
Get hands-on with reading secrets from different providers and using them in your Dagger pipelines.
Submissions: 6/31
Challenge, Easy, on
Dagger: Module Dependencies
Learn how to install, update and uninstall Dagger module dependencies.
Submissions: 3/8
Community Collection
Challenges contributed by the community members sharing their knowledge and expertise.
Challenge, Hard, on
Troubleshoot a Website That Is Not Accessible
by Omkar Shelke
A web application is deployed but the website is not accessible. Investigate and fix the issue.
Submissions: 52/105
Challenge, Medium, on
Kubernetes - PV Reclaim Policies and Recovery
Observe the Delete and Retain reclaim policies in action, recover a Released PV by patching claimRef, and recover data by creating a new PV pointing to the same storage directory.
Challenge, Medium, on
Klustered: Level Four
The cluster is broken again. Get the Klustered deployment healthy and serving a quote, then ship the v2 image to unlock the victory dance.
Submissions: 16/22
Challenge, Easy, on
The SED command : Survival Guide - What You Must Know
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/.
Submissions: 53/119