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

30 minutes
  • 3 Learning Objectives

About this Hands-on Lab

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!

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

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.

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.

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.

Additional Resources

Use the provided environment to complete the tasks detailed in the learning objectives.

You can access all components of the cluster from the CLI server. The control plane server is k8s-control, and the worker is k8s-worker1. If you need to log in to the control plane server, for example, just use ssh k8s-control from the CLI server.

You can also use kubectl from the CLI server, control plane node, or worker to interact with the cluster. In order to use kubectl from the CLI server, you will need to select the acgk8s cluster to interact with, like so: kubectl config use-context acgk8s.

kubectl is aliased to k, and Kubernetes autocompletion is enabled. You can use the k alias like so: k get pods.

What are Hands-on Labs

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

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Psst…this one if you’ve been moved to ACG!

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