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, Medium, on Linux

Make a Filesystem Mount Survive a Reboot

Discover that a simple mount command doesn't survive a reboot and learn how to make mount points persistent using /etc/fstab or systemd.

storage mount filesystem fstab systemd

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

Challenge, Medium, on Linux, Networking

Protect an Unintentionally Exposed Server Port with Firewall Rules

by Ivan Velichko

An HTTP service is running on the server, but it's exposed to the entire network. Use Linux firewall tools to block external access to the service port while keeping it accessible locally.

firewall iptables nftables ufw firewalld

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

Challenge, Medium, on Containers, Linux

Execute Host Commands Inside a Running Container

by Ivan Velichko

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

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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, 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