kustomize

Kubernetes configurations across multiple environments are managed declaratively using overlays. This allows you to define a base configuration and apply environment-specific patches for development, staging, and production without complex templating.

Customizing Kubernetes manifests without templating is achieved through declarative overlay patching. You apply changes to existing manifests without directly editing them, ensuring maintainability while avoiding complex template syntax.

ConfigMaps and Secrets can be generated declaratively for Kubernetes. This approach integrates configuration generation directly into your manifest management workflow alongside resource patching and environment overlays.

Environment-specific overlays for replica counts, namespaces, and image tags are applied by defining a base configuration and creating distinct overlay files. This separates environment variables from the core application definitions.

Kustomize integrates directly with kubectl for building and applying configurations. You can apply your customized production configurations to a Kubernetes cluster seamlessly through native kubectl commands.

Overlays for Kubernetes deployment are needed when managing distinct configurations across multiple environments. They allow you to patch resources and set specific parameters like namespaces without duplicating entire manifest files.