Preparing Kubernetes for Dynamic Admission Controllers

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Preparing Kubernetes for Dynamic Admission Controllers

Admission controllers vet Kubernetes objects before running and can be a powerful part of a Kubernetes cluster. However, not all Kubernetes installs are set up to use admission controllers out of the box. In this lab, we'll check to see if the provided Kubernetes setup can use the provided admission controller and then set up our Kubernetes server to use the desired controller.

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Lab Info

Level

Intermediate

Last updated

Sep 09, 2025

Duration

15m

Challenge

Attempt to Run Fail State

Run the provided bad-pod.yml file to see if the admission controller stops its creation.

Remove the Pod if it fails.
Challenge

Check Setup

Check to see if the admission registration's API is enabled. Also, check for enabled admission controllers.
Challenge

Enable Controller

Enable the ImagePolicyWebhook controller on the kube-apiserver.
Challenge

Test Setup

Check that the admission controller runs as intended.

NOTE: kube-apiserver may take several moments to restart.

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