kustomize-overlays

What it does

This skill enables AI agents to manage Kubernetes configurations using Kustomize overlays. It allows for the customization of base application definitions by applying environment-specific patches and overrides without modifying the original source files.

When to use it

• Deploying identical applications across multiple environments (e.g., dev, staging, production) with varying resource limits or feature flags.
• Managing configuration drift by ensuring all environments derive from a single, immutable base definition.
• Applying environment-specific secrets or labels dynamically during the build process.

Key capabilities

• Manages Kustomize base configurations and overlay directories.
• Applies patches to customize resources for specific environments.
• Generates final Kubernetes manifests by merging base and overlay configurations.

Example prompts

• "Create a Kustomize overlay for the production environment that increases memory limits for the API service."
• "Generate a deployment manifest by applying the 'staging' overlay to my existing base configuration."
• "Patch the database service in the development overlay to use a different image tag than the base definition."

Tips & gotchas

Ensure your base Kustomization file is properly structured before attempting to apply overlays, as missing patches will cause build failures. Remember that Kustomize does not support version control for the generated output files; always commit both the base and overlay directories separately.