Learning: Kubernetes – Persistent Volume & Persistent Volume Claim

Volume – Volume in Kubernetes can be thought of as a directory that can be accessed by containers in the pod. Volume helps persists the data even if the pod restarts.

  • PV
    • A Persistent Volume (PV) is a piece of storage in the cluster.
    • It is a cluster-level resource like a pod and doesn’t have any namespace.
    • It is been manually provisioned by an administrator, or dynamically provisioned by Kubernetes using a StorageClass.
  • PVC
    • A PersistentVolumeClaim (PVC) is a request for storage by a user that can be fulfilled by a PV.
    • Persistent Volumes and PersistentVolumeClaim are independent of Pod lifecycles and preserve data through restarting, rescheduling, and even deleting Pods.
  • Access Modes
    • ReadWriteOnce – It is used when we allow only one node to read & write on the volume. Multiple pods running on the same node can access the volume.
    • ReadOnlyMany – It is used when we allow read access to many pods.
    • ReadWriteMany – It is used when we allow read & write access to many nodes.
    • ReadWriteOncePod – It is used when we allow only one pod in a node for reading & writing.

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