Write a Dockerfile for a Simple Web Server Application
Learn how to write a Dockerfile from scratch and build a working container image for a simple web server application.
Submissions: 21/29
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.
Challenge, Easy, on
Install Linux Packages from Remote Repositories (Debian & Ubuntu Edition)
Practice one of the key Linux skills - installing packages from remote repositories.
Submissions: 35/44
Challenge, Easy, on
Install Linux Packages from Remote Repositories (Fedora & RHEL Edition)
Practice one of the key Linux skills - installing packages from remote repositories.
Submissions: 18/18
Challenge, Easy, on
Archive and Extract Files and Directories with tar
Practice basic tar operations: extract an archive, create a compressed backup, and install software from a release tarball using the 'tar' command.
Submissions: 15/18
Challenge, Medium, on
Make a Container Restart Automatically After Docker Host Reboot
Learn how to configure a Docker host and its containers to automatically restart when the server reboots or the Docker daemon restarts.
Submissions: 16/27
Challenge, Medium, on
Make a Container Restart Automatically After Podman Host Reboot
Unlike Docker, Podman is daemonless and requires some extra systemd help to monitor and restart containers. Learn how to configure a Podman host and its containers to automatically restart after a server reboot.
Submissions: 7/8
Challenge, Easy, on
Gracefully Stop a Container With a Lengthy Shutdown Sequence
Learn how to properly stop a Docker container whose application needs more than the default 10 seconds to shut down gracefully.
Submissions: 12/28
Protect an Unintentionally Exposed Server Port with Firewall Rules
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.
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.
Submissions: 393/879
Run a Sidecar Container in the Namespace of Another Container
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.
Submissions: 181/348