Kubernetes Operator Patterns Cheat Sheet

CRDs, controllers, and reconciliation

Last Updated: November 21, 2025

Focus Areas

Focus
Version CRDs with validation and conversion webhooks
Design controllers to watch a single resource type per loop

Commands & Queries

kubectl get crds
Inspect defined custom resources
operator-sdk run --local
Run the operator locally
kubectl apply -f watches.yaml
Configure resource watches

Summary

Predictable operators use versioned CRDs and deterministic reconciliation.

💡 Pro Tip: Keep reconciliation loops idempotent and target only managed resources.
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