Day 36 Task: Managing Persistent Volumes in Your Deployment

🔶 What are Persistent Volumes in K8s

In Kubernetes, a Persistent Volume (PV) is a piece of storage in the cluster that has been provisioned by an administrator. A Persistent Volume Claim (PVC) is a request for storage by a user. The PVC references the PV, and the PV is bound to a specific node. Read official documentation of Persistent Volumes.

Prerequisites Make instances of t2.medium.

Install minikube, login dockerhub, build docker push image to docker hub and use that image for your deployment.yml

🔶 Task 1: Add a Persistent Volume to your Deployment todo app.

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

•   apiVersion: v1
    kind: PersistentVolume
    metadata:
      name: pv-django
    spec:
      capacity:
        storage: 2Gi
      accessModes:
        - ReadWriteOnce
      persistentVolumeReclaimPolicy: Retain
      hostPath:
        path: "/mnt/data"
  

  

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

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

  

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

•   apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: todo-app-deployment
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: todo-app
      template:
        metadata:
          labels:
            app: todo-app
        spec:
          containers:
            - name: todo-app
              image: chandreshpatle28/django-todo:latest
              ports:
                - containerPort: 8000
              volumeMounts:
                - name: todo-app-data
                  mountPath: /app
          volumes:
            - name: todo-app-data
              persistentVolumeClaim:
                claimName: pvc-django
  

  

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

  

• Verify that the Persistent Volume has been added to your Deployment by checking the status of the Pods and Persistent Volumes in your cluster. Use this command kubectl get pods, kubectl get pv

  

⚠️ Don't forget: To apply changes or create files in your Kubernetes deployments, each file must be applied separately. ⚠️

🔶 Task 2: Accessing data in the Persistent Volume.

• Connect to a Pod in your Deployment using the command: kubectl exec -it <pod-name> -- /bin/bash

• Verify that you can access the data stored in the Persistent Volume from within the Pod.

  

Need help with Persistent Volumes? Check out this video for assistance.

Happy Learning :)

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