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.

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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 Linux

Install Linux Packages from Remote Repositories (Debian & Ubuntu Edition)

by Ivan Velichko

Practice one of the key Linux skills - installing packages from remote repositories.

os-packages apt dpkg debian ubuntu

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

Challenge, Easy, on Linux

Install Linux Packages from Remote Repositories (Fedora & RHEL Edition)

by Ivan Velichko

Practice one of the key Linux skills - installing packages from remote repositories.

os-packages dnf rpm fedora rhel

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

Challenge, Easy, on Linux

Archive and Extract Files and Directories with tar

by Ivan Velichko

Practice basic tar operations: extract an archive, create a compressed backup, and install software from a release tarball using the 'tar' command.

tar

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

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

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

Challenge, Medium, on Containers, Linux

Free Up Disk Space by Removing Unused Docker Volumes

by Ivan Velichko

Your Docker host has been in use for a while. Anonymous and named volumes piled up, disk space is tight, and it's time to clean stuff up.

docker container-volume filesystem

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

Challenge, Easy, on Linux

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

by Ivan Velichko

Practice mapping existing directories to new paths using Linux bind mounts and see the core tech behind container volumes in action.

storage mount filesystem