ITGSS Certified DevOps Engineer Practice Test 2025 - Free DevOps Practice Questions and Exam Preparation Guide

The tool that is specifically designed to prevent unapproved images from being used in a containerized application is the ImagePolicyWebhook. This component acts as a gatekeeper that integrates with a Kubernetes cluster to enforce image policies, which can include rules about which container images are permitted based on specified criteria, such as image repository or tag.

By utilizing the ImagePolicyWebhook, teams can mitigate risks associated with image security vulnerabilities and compliance issues by ensuring that only approved and trusted images are deployed within their environments. When an application attempts to use an image, the webhook intercepts the request, evaluates it against the defined policies, and either allows or denies the use of the image based on those policies. This approach provides a robust mechanism to enhance the security posture of containerized applications.

While Admission Controllers also play a significant role in managing requests to create or modify Kubernetes resources, they are broader in scope and include various types of validations and mutations, not specifically focused only on image policies. A Container Registry is primarily concerned with the storage and management of container images rather than regulating usage. Service Mesh focuses on managing communication between microservices and does not handle image approval for containers. Thus, the ImagePolicyWebhook stands out as the dedicated tool for controlling image usage within containerized applications.