Challenges | iximiuz Labs

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 Programming, Linux

Write a C Program Without a main() Function

by Başar Subaşı

Produce a valid ELF binary that runs and exits cleanly, but does not define a main() function.

#c #gcc #assembly #linker #elf

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 Kubernetes

Configure Health Probes and Graceful Shutdown for a Kubernetes Deployment

by Omkar Shelke

A deployment is running without health probes or graceful shutdown configuration. Add startup, liveness, and readiness probes plus a preStop hook and terminationGracePeriodSeconds to make it ready for real traffic.

#cka #ckad #probes #lifecycle #graceful-shutdown

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 Kubernetes

Create and Assign a Custom PriorityClass to a Workload

by Omkar Shelke

Create a PriorityClass for production workloads and patch an existing deployment to use it, ensuring critical services get scheduled first during resource contention.

#cka #deployment #priorityclass #scheduling

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 Kubernetes

Enable Per-Pod DNS Records for a Deployment

by Omkar Shelke

A service in the mesh namespace returns only a single IP during DNS lookup, preventing the peer-server pods from finding each other. Investigate why DNS does not return one address per pod and change the service configuration so that peer discovery works correctly.

#cka #ckad #service #dns #deployment

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 Kubernetes, Networking

Extend the Cluster with an Additional Service CIDR for the dev Team

by Omkar Shelke

Add a new, separate Service CIDR range for the dev team using the ServiceCIDR API object — without touching or restarting the cluster's default Service CIDR — then create a Service with an explicit ClusterIP inside that new range and verify DNS resolution.

#cka #ckad #service #service-cidr #cluster-ip

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 Kubernetes

Inject a Config File Without Overwriting the Image's Existing Directory

by Omkar Shelke

A webapp deployment in the prod namespace is stuck in CrashLoopBackOff. The application's startup probe checks that its existing config directory is intact before the container is marked healthy. Fix the deployment so configuration is injected correctly and the pod reaches Running state with its health check endpoint responding on port 8080.

#ckad #cka #configmap #probes #debugging

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 Kubernetes, Networking

Pin a Client to the Same Pod Using Service Session Affinity

by Omkar Shelke

Configure a Kubernetes Service so that requests from the same client IP are always routed to the same backend Pod for a sustained period, using ClientIP-based session affinity.

#cka #ckad #service #session-affinity #load-balancing

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 Kubernetes

Reclaim a Retained PV with a New PVC and Restore a Lost MariaDB Database

by Omkar Shelke

A MariaDB deployment and its PVC were accidentally deleted. The PersistentVolume survived due to its Retain policy. Restore the database by rebinding the existing PV without losing any data.

#cka #ckad #persistentvolume #pvc #storage

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 Kubernetes

Mount a ConfigMap and Secret into a Single Directory Using a Projected Volume

by Omkar Shelke

Combine an existing ConfigMap and Secret into one volume and mount them at a single path inside a Pod — using only one volume definition.

#ckad #configmap #secret #projected-volume #volumes

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

Challenge, Medium, on Networking, Linux

Reach a Remote Loopback Port Through an SSH Jump Host

by Ivan Velichko

An inventory service lives inside a private VPC and keeps its debugging port bound to 127.0.0.1. Use SSH local port forwarding with a jump-only bastion to query the debugging port from your workstation.

#ssh #tunnel #port-forwarding #bastion #jump-host