Security in a cloud-native environment is only as strong as its weakest link. A recent security audit revealed a critical gap: container images were being deployed to our cluster with outdated software versions harboring numerous vulnerabilities.
To solve this, we are implementing an ImagePolicyWebhook. By configuring an Admission Controller to point to a webhook backend image scanner, we can intercept deployment requests and reject any image that doesn't meet our security standards.
The Solution
In this walkthrough, we will configure the Kubernetes API server to communicate with an existing scanner (like Trivy) via a webhook.
1. Configure the Admission Controller
