No More Helm Charts? Why Kustomize Might Be All You Need

In this blog post, I’ll share my learning experience with Kustomize, why it’s so useful, how it compares to Helm, and some of the practical things I learned along the way — especially around customizing Kubernetes resources with overlays, patches, and generators.

What is Kustomize?

In simple terms, Kustomize is a tool for managing Kubernetes resources in a more declarative and modular way. You can think of it as a way to customize Kubernetes YAML files without needing to modify the original manifests directly. It’s great for managing different environments (like dev, staging, and production) because you can reuse the same base configuration and make specific customizations per environment.

One thing I found particularly helpful was that Kustomize helps keep everything DRY (Don’t Repeat Yourself). Instead of having multiple copies of the same Kubernetes manifests for different environments, Kustomize lets you keep the base configuration and apply overlays to modify the base as needed.

Kustomize vs. Helm: What’s the Difference?

Helm is a package manager for Kubernetes, enabling the packaging, deployment, and management of applications using charts, while Kustomize is a configuration management tool that allows…