Explain the differences between Deployment, StatefulSet, PersistentVolume, and PersistentVolumeClaim in Kubernetes.
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Answer from AI
In Kubernetes, these objects serve different functions:
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Deployment — manages the creation and updating of a set of Pods. It provides declarative management of application versions, automatic rollback, and scaling.
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StatefulSet — similar to Deployment but designed for managing stateful applications that require stable identities and ordered deployment (e.g., databases). It provides unique names and stable storage for each Pod.
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PersistentVolume (PV) — an abstraction of physical storage in the cluster (e.g., disk, NFS). PV is created by an administrator and represents a storage resource.
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PersistentVolumeClaim (PVC) — a user request for a specific amount and type of storage. PVC is bound to an appropriate PV, providing Pods access to persistent storage.
Example: Deployment creates Pods that use PVC for data storage, and PVC is bound to PV, ensuring data persistence across Pod restarts.