Guide Kubernetes controller implementation with controller-runtime and Kubebuilder.
npx skills add https://github.com/pokgak/agent-skills --skill k8s-controller
Please help me install this Agent Skill. Skill: k8s-controller Source: https://github.com/pokgak/agent-skills/tree/main/skills/k8s-controller Command: npx skills add https://github.com/pokgak/agent-skills --skill k8s-controller
Kubernetes controllers often fail in production due to non-idempotent reconciliation, broken finalizer lifecycles, incorrect RBAC, missed watch events, or inefficient workqueue patterns. This skill helps you design and review controller-runtime and Kubebuilder operators that behave correctly under deletes, conflicts, retries, and high event volume.
Use the k8s-controller skill when you are implementing or reviewing a Kubernetes controller and want to apply reliable reconcile, finalizer, RBAC, and watch patterns.
High-intent search queries and answers about installing and using this skill.
Level-based idempotent reconciliation ensures your Kubernetes controller processes the current desired state rather than specific event sequences. This approach handles NotFound resources gracefully and safely retries conflicts without duplicate side effects.
Finalizer cleanup in controller-runtime requires adding the finalizer during initial reconciliation, executing deletion logic, and removing the finalizer only after successful cleanup to prevent resource leaks and ensure safe deletion behavior.
Configure watch predicates in Kubebuilder using SetupWithManager to filter irrelevant events, and set MaxConcurrentReconciles to control parallel reconciliation workers, ensuring efficient workqueue processing without overwhelming the API server.
Kubernetes operators miss watch events or fail under high volume due to incorrect predicates, blocking I/O in Reconcile, or inefficient workqueue patterns. Use level-based reconciliation and non-blocking operations to handle surges reliably.
Write RBAC markers and CRD validation rules in Kubebuilder using kubebuilder markers on your Go types, specifying status subresources, finalizer intent, and print columns to ensure correct permissions and custom resource definitions.
Test Kubernetes controllers using fake clients for unit testing reconciliation logic and Kind clusters for functional verification, validating controller-runtime behavior against real API server semantics and CRD validation rules.
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