Certified Kubernetes Security Specialist (CKS)

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Certified Kubernetes Security Specialist (CKS) - Practice Exam Part 4

This lab provides practice scenarios to help prepare you for the Certified Kubernetes Security Specialist (CKS) exam. You will be presented with tasks to complete, as well as server(s) and/or an existing Kubernetes cluster to complete them in. You will need to use your knowledge of Kubernetes to successfully complete the provided tasks, much like you would on the real CKS exam. Good luck!

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Lab Info

Level

Intermediate

Last updated

Sep 24, 2025

Duration

30m

Challenge

Configure Admission Control

The cluster needs to be configured to scan incoming container images before running workloads. An image scanning service is already set up.

Modify the admission control configuration so that it will implicitly deny images, even if the image scanning service is unreachable. The global admission control configuration is at /etc/kubernetes/admission-control/admission-control.conf, and the specific configuration for the admission controller is at /etc/kubernetes/admission-control/imagepolicy.conf.
Challenge

Set the URL of the Image Scanning Service

Add the URL of the image scanning service to the kubeconfig used by the admission controller.

The service can be reached at https://acg.trivy.k8s.webhook:8090/scan.
Challenge

Enable the Admission Control Plugin(s)

In the kube-apiserver manifest, enable any admission control plugin(s) necessary to scan images.

There are two Pod manifests in /home/cloud_user on the CLI server. If your setup is working, no-vulns-pod.yml should pass image validation, while vulns-pod.yml should fail due to vulnerabilities.

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