Persistent Volumes in Kubernetes Deployment

Persistent Volumes & Persistent Volume Claim (PV & PVC)

A PersistentVolume (PV) is a piece of storage in the cluster that has been provisioned by an administrator or dynamically provisioned using Storage Classes.
It is a resource in the cluster just like a node is a cluster resource. PVs are volume plugins like Volumes, but have a lifecycle independent of any individual Pod that uses the PV.
This API object captures the details of the implementation of the storage, be that NFS, iSCSI, or a cloud-provider-specific storage system.

Step 1 : Create a Persistent Volume (PV)

Create a YAML file named pv.yml,

apiVersion: v1
kind: PersistentVolume
metadata:
  name: my-pv
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: /mnt/data

Apply,

kubectl apply -f pv.yml

Step 2 : Create a Persistent Volume Claim (PVC)

Create a YAML file named pvc.yml,

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: my-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

Apply,

kubectl apply -f pvc.yml

Step 3 : Use the PVC in a Pod

Create a YAML file named pod.yml,

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
    - name: my-container
      image: nginx
      volumeMounts:
        - mountPath: "/usr/share/nginx/html"
          name: my-storage
  volumes:
    - name: my-storage
      persistentVolumeClaim:
        claimName: my-pvc

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Managing Persistent Volumes in k8s Deployment

Persistent Volumes & Persistent Volume Claim (PV & PVC)

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