Automatically Rewrite Kubernetes Image Registries Using Kyverno

In this video, I demonstrate how to automatically rewrite Kubernetes image registries using Kyverno, following a real-world pattern used in production clusters to improve container supply chain security.

Instead of allowing workloads to pull images directly from public registries like Docker Hub, Kyverno is used as a Kubernetes admission controller to transparently rewrite image references to an internal or pull-through cache registry and inject the required imagePullSecrets, without changing application manifests or Helm charts.

This short lab covers:

Installing Kyverno in a Kubernetes cluster using Helm

Rewriting Docker Hub image references at admission time

Using Kyverno mutation policies to enforce registry control

Automatically injecting imagePullSecrets into Pods

Verifying mutated Pod specs with kubectl

Testing image registry rewriting with a sample nginx workload

This approach is commonly used by platform engineering, DevOps, and SRE teams to:

Enforce trusted image sources

Improve reliability and performance via registry caching

Centralize image scanning, signing, and governance

Reduce risk from public registry outages or compromises

📘 Related article (free):
👉 https://medium.com/p/2fca7230d54b

🧪 Lab environment: Killercoda
⚙️ Technologies: Kubernetes, Kyverno, Helm, Docker Registry

Видео Automatically Rewrite Kubernetes Image Registries Using Kyverno канала DEVOPS DYNAMO