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Managing Persistent Volumes in Your Deployment 💥

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Chirag Manglik
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Managing Persistent Volumes in Your Deployment 💥

Persistent Volumes in k8s:-

In Kubernetes (k8s), a Persistent Volume (PV) is a piece of storage in the cluster that has been provisioned by an administrator or dynamically provisioned using Storage Classes. Persistent Volumes are used to store data in a way that it persists beyond the lifecycle of a pod. This allows data to be retained even if the pod is terminated or rescheduled.

Here are some key concepts related to Persistent Volumes in Kubernetes:

  1. Persistent Volume (PV): This is a cluster-wide resource that represents a piece of storage in the cluster. PVs are provisioned by administrators manually or dynamically by Storage Classes.

  2. Persistent Volume Claim (PVC): This is a request for storage by a user. It is used by a pod to claim a specific amount of storage from a PV. PVCs are bound to PVs, and the actual storage is provisioned dynamically based on the Storage Class or statically if the PV is pre-provisioned.

  3. Storage Class: A Storage Class is used by administrators to define different "classes" of storage in a Kubernetes cluster. Storage Classes enable dynamic provisioning of Persistent Volumes.

Here is a basic example of how Persistent Volumes work:

yamlCopy codeapiVersion: v1
kind: PersistentVolume
metadata:
  name: example-pv
spec:
  capacity:
    storage: 5Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: example-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3Gi
---
apiVersion: v1
kind: Pod
metadata:
  name: example-pod
spec:
  containers:
    - name: example-container
      image: nginx
      volumeMounts:
        - name: data-volume
          mountPath: "/usr/share/nginx/html"
  volumes:
    - name: data-volume
      persistentVolumeClaim:
        claimName: example-pvc

In this example:

  • A Persistent Volume (example-pv) is defined with a capacity of 5Gi, using a hostPath as the storage backend.

  • A Persistent Volume Claim (example-pvc) requests 3Gi of storage with the access mode ReadWriteOnce.

  • A Pod (example-pod) is defined as a container that mounts the Persistent Volume Claim as a volume.

Today's Task:-

  • Create a Persistent Volume using a file on your node.

  • Create a Persistent Volume Claim that references the Persistent Volume.

  • Update your deployment.yml file to include the Persistent Volume Claim. After Applying pv.yml pvc.yml your deployment file looks like this Template.

  • Apply the updated deployment using the command: kubectl apply -f deployment.yml

Day 36 of #90daysofDevOps

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