Choose Wisely: Understanding Kubernetes Selectors
summary
Shows exact controller behaviors with live demos: deployments add a pod-template-hash label so a ReplicaSet controls only its own pods, while creating an rs directly can adopt an existing pod (apply rs with desired 3 replicas but only two new pods created because one older standalone pod is adopted). Services/endpoints use equality-based selectors only and will include any matching pod, enabling blue/green, canary and highlander patterns by relabeling pods. OwnerReference prevents controller thrashing; all demos run successfully.
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