infra-kustomize-environment-management

Kustomize manages environment-specific Kubernetes configurations by keeping shared resources in a base directory and applying environment-specific changes via overlays and patches, avoiding fragile YAML templates. This approach keeps dev, staging, and production configurations reviewable and maintainable.

The best way to override image tags and replicas per Kubernetes environment is using Kustomize overlays with the images field for repository and tag overrides, and strategic merge or JSON 6902 patches to adjust replica counts and debug config per environment.

Validate rendered Kustomize overlays by running dry-runs and diffs against the effective manifest. You can render the specific overlay, inspect the resulting YAML for correctness, and document validation commands in your story for safe review and deployment.

Yes, you need existing base manifests or existing overlays to use this Kustomize configuration approach. The skill requires base directories containing shared resources to apply environment-specific patches, image overrides, and namespace changes across dev, staging, and production overlays.

Use strategic merge patches for standard Kubernetes field overrides like replica counts and config updates, and JSON 6902 patches for precise, targeted modifications to specific array elements or fields where strategic merge syntax is insufficient for your overlay strategy.