When deploying applications on Kubernetes, most use cases involve stateless workloads. However, some applications require each instance to maintain a unique identity, persistent storage, or stable network identifiers. For such cases, Kubernetes provides StatefulSets , a resource designed specifically for managing stateful applications. What are StatefulSets? StatefulSets are a Kubernetes workload API object used to manage stateful applications. Unlike Deployments or ReplicaSets, StatefulSets provide guarantees about the order and uniqueness of pod creation, scaling, and deletion. Key Features of StatefulSets Stable Network Identity : Each pod in a StatefulSet gets a stable hostname that doesn’t change even if the pod is restarted. Hostnames follow the pattern: pod-name-[ordinal] . Persistent Storage : StatefulSets work seamlessly with persistent volumes (PVs), ensuring that storage is not lost even if pods are terminated or rescheduled. Ordered Deployment and Scaling : Pods are ...
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