Kubernetes PVC: Persistent Volume Claim Explained with Examples

Kubernetes Persistent Volume Claim (PVC) is a resource object used in Kubernetes to request storage resources from a storage provider. PVCs are used by Pods to dynamically request and bind to a Persistent Volume (PV), which is a piece of networked storage in the cluster.\n\nPVCs decouple the storage requirements of an application from the underlying storage technology, making it easier to manage and scale storage resources in a Kubernetes cluster. PVCs provide a way to abstract the storage details and allow applications to request storage of a specific size, access mode, and storage class.\n\nTo create a PVC, you need to define the desired storage capacity, access mode (read-write or read-only), and optionally specify a storage class. The storage class defines the type of storage provisioner to use, such as AWS EBS or Azure Disk, and any additional parameters specific to that storage provider.\n\nOnce a PVC is created, Kubernetes will try to find a suitable PV that matches the requested criteria. If a matching PV is available, it will be bound to the PVC, and the Pod requesting the PVC can then use that PV for persistent storage.\n\nHere is an example YAML definition of a PVC:\n\nyaml\napiVersion: v1\nkind: PersistentVolumeClaim\nmetadata:\n name: my-pvc\nspec:\n accessModes:\n - ReadWriteOnce\n resources:\n requests:\n storage: 10Gi\n storageClassName: fast\n\n\nIn this example, the PVC requests 10GB of storage with ReadWriteOnce access mode and specifies the storage class as "fast". The storage class definition will determine how the storage is provisioned and the specific parameters to be used.\n\nPVCs are a crucial part of managing storage in Kubernetes, as they allow for dynamic provisioning, resizing, and binding of storage resources to Pods.