Kustomize Overlays

Master environment-specific Kubernetes configuration management using Kustomize overlays, strategic merge patches, and JSON patches for development, staging, and production environments.

Overview

Overlays enable environment-specific customization of Kubernetes resources without duplicating configuration. Each overlay references a base configuration and applies environment-specific patches, transformations, and resource adjustments.

Basic Overlay Structure

myapp/
├── base/
│   ├── kustomization.yaml
│   ├── deployment.yaml
│   ├── service.yaml
│   ├── configmap.yaml
│   └── ingress.yaml
└── overlays/
    ├── development/
    │   ├── kustomization.yaml
    │   ├── replica-patch.yaml
    │   └── namespace.yaml
    ├── staging/
    │   ├── kustomization.yaml
    │   ├── replica-patch.yaml
    │   ├── resource-patch.yaml
    │   └── namespace.yaml
    └── production/
        ├── kustomization.yaml
        ├── replica-patch.yaml
        ├── resource-patch.yaml
        ├── hpa.yaml
        └── namespace.yaml

Base Configuration