What is a Kubernetes StatefulSet?
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Quick Answer
A StatefulSet manages stateful applications, giving each pod a stable, unique identity — a persistent name/network ID and its own persistent volume — with ordered, graceful deployment and scaling.
Detailed Answer
Unlike a Deployment stateless, interchangeable pods, StatefulSet pods are pod-0, pod-1, ... with stable DNS and dedicated PVCs that survive rescheduling — essential for databases, Kafka, and clustered systems that need stable membership and storage. Scaling and rolling updates happen in order, which matters for quorum-based systems.
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Interview Tip
Stress stable identity + per-pod persistent storage + ordering, and name databases/Kafka as use cases.
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