Exam CKS Topic 1 Question 59 Discussion

Solution (Step by Step) :
1. Enable Image Admission Controller:
- Install the Admission Controller. The 'ImagePolicyWebhook' admission controller enforces policies on container images. You can install it as part of your Kubernetes deployment or using a Helm chart.
2. Create a Policy Configuration:
- Define the Policy: Use a YAML file to define the rules for the admission controller. This policy will specify the allowed registries.
- Example Policy Configuration:

3. Configure the Service: - Create a Service: Create a Kubernetes service that exposes the admission controllers endpoint. - Example Service Configuration:

4. Deploy the Policy Engine: - Create a Deployment: Create a Kubernetes deployment to run the policy engine (e.g., a container image with the admission controller logic). - Example Deployment Configuration:

5. Verify the Configuration: - Test Image Pulls: Attempt to pull images from both authorized and unauthorized registries. - Monitor tor Policy Enforcement: Observe the admission controllers logs to confirm that it iS successtully blocking pulls from unauthorized registries. - Validate Security: Ensure that the policy effectively prevents the use of unauthorized container image sources, enhancing the clusters security posture.