StatefulSet vs Deployment: How Kubernetes Manages Pod Identity Differently

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A hands-on Kubernetes tutorial demonstrates the key difference between Deployment and StatefulSet using the same container image deployed two ways on AWS EC2. Deployments assign random names to pods and replace deleted pods with entirely new identities, prioritising availability over consistency. StatefulSets, by contrast, assign stable sequential names — such as restaurant-statefulset-0, 1, 2 — and restore deleted pods with their original identity rather than creating a new one. The tutorial uses live kubectl commands and pod deletion exercises to make the concept tangible for students. The core lesson is that Deployments treat pods as interchangeable, while StatefulSets treat each pod as a unique, irreplaceable identity.

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ProgrammingDEV Community ·

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