Extending Kubernetes with CustomResouceDefinition

on YouTube ↗36m

" summary

Shows how to extend Kubernetes with a CustomResourceDefinition for sensors and a small controller/operator that watches those JSON objects, created via kubectl create -f sensor, and reacts (PATCH/UPDATE/DELETE) to emit events and call external services. Uses client-go informers and local caches to avoid hot polling, handles optimistic-patch conflicts with retries (few-second backoff), and demonstrates a working sample controller. Notes scaling limits across many namespaces/clusters and edge cases where retries or long reconcile loops cause missed updates.

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" chapters (10)

1. 0:00Introduction to Custom Resources
2. 3:13What is a CustomResourceDefinition
3. 7:17Use case with temperature sensors
4. 13:13Creating and managing custom resources
5. 18:13Defining resource properties
6. 22:20Controllers and operators
7. 26:16Event handling in controllers
8. 30:16Best practices for controllers
9. 33:14Compliance and policies
10. 35:29Summary and closing

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