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Interactive Explainer

Advanced Kubernetes Operators

Building production-grade operators with controller-runtime, webhook admission, status subresource, and testing strategies.

🎯Key Takeaways
Finalizers = cleanup hook on resource deletion
Status subresource = clients cannot accidentally update status
Admission webhooks = validation + defaulting before persist

Advanced Kubernetes Operators

Building production-grade operators with controller-runtime, webhook admission, status subresource, and testing strategies.

~1 min read
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What you'll learn
  • Finalizers = cleanup hook on resource deletion
  • Status subresource = clients cannot accidentally update status
  • Admission webhooks = validation + defaulting before persist

Advanced Operator Concepts

Production operators need: admission webhooks (defaulting + validation before persist), status subresource (separate status from spec, prevents accidental overwrites), finalizers (cleanup resources on deletion), leader election (HA controller), and comprehensive envtest testing with controller-runtime.

Key takeaways

  • Finalizers = cleanup hook on resource deletion
  • Status subresource = clients cannot accidentally update status
  • Admission webhooks = validation + defaulting before persist

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