Persistent Volumes in Deployment in K8s

Task 1:

Add a Persistent Volume to your Deployment todo app.

• 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 look like this

• 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 commands kubectl get pods , kubectl get pv

Task 2:

Accessing data in the Persistent Volume,

• Connect to a Pod in your Deployment using command : kubectl exec -it -- /bin/bash

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

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Task 1

Step 1: create pv.yml file

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-todo-app
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: "/tmp/data"

Step 2: Apply the file

kubectl apply -f pv.yml

Step 3: Create pvc.yml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-todo-app
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 500Mi

Step 4: Apply the file

kubectl apply -f pvc.yml

Step 5: Modify or create deployment file and add volumeMounts and volumes data.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: django-todo-deploy
  labels:
    app: django-todo
  namespace: django-todo-ns
spec:
  replicas: 1
  selector:
    matchLabels:
      app: django-todo
  template:
    metadata:
      labels:
        app: django-todo
    spec:
      containers:
        - name: django-todo-app
          image: vinay000/django-todo-app:latest
          ports:
            - containerPort: 8001
          volumeMounts:
            - name: todo-app-data
              mountPath: /app
      volumes:
        - name: todo-app-data
          persistentVolumeClaim:
            claimName: pvc-todo-app

Step 6: Apply the file.

kubectl apply -f django-todo-Deployment.yml

Step 8: Verify.

kubectl get pods -n=django-todo-ns

kubectl get pv -n=django-todo-ns

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Task 2

Step 1: Connect to the Pod in your Deployment using command : kubectl exec -it POD-NAME /bin/bash

Step 2: Change directory to app

Step 3: Create a file and delete the Pod.

Step 4: To verify whether the volume working or not by checking the new pod that has the same file.

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So this was the tutorial on creating volume in k8s. Hope you learned something from this. Thank You!