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: 36/51
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: 14/31
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.
Community Collection
Challenges contributed by the community members sharing their knowledge and expertise.
Challenge, Medium, on
Diagnose Why a DaemonSet Skips the Control Plane Node
by Omkar Shelke
Troubleshoot and update a Kubernetes DaemonSet so that its Pods run on all nodes in the cluster, including the control plane.
Submissions: 30/35
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
Kubernetes - Dynamic Provisioning with StorageClass
Explore how the DefaultStorageClass admission controller injects storage classes, explicitly name a StorageClass, switch the cluster default, and inspect where local-path stores volumes on the node.
Submissions: 5/5
Challenge, Medium, on
Kubernetes - PersistentVolume Static Binding Patterns
Learn the three static PV binding patterns - generic match, label selector, and bidirectional claimRef - then use a no-provisioner StorageClass with WaitForFirstConsumer to pin storage to a specific node.