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emptyDir Volume Demo

Let's see how we can use emptyDir volume as temporary storage.

Here is the Docker Image used in this tutorial: reyanshkharga/nginx

Step 1: Create a Deployment With emptyDir Volume

Let's create a deployment as follows:

apiVersion: apps/v1
kind: Deployment
  name: my-deployment
  replicas: 1
      app: nginx
        app: nginx
      - name: nginx
        image: reyanshkharga/nginx:v1
        command: ["/bin/sh"]
        args: ["-c", "while true; do echo $(date -u) >> /data/my-temp-data.txt; sleep 5; done"]
        - name: my-volume
          mountPath: /data
      - name: my-volume
        emptyDir: {}

Observe the following:

  1. We have added an emptyDir volume named my-volume in the pod template
  2. The pod has only one container
  3. The emptyDir volume is mounted on /data directory of the container
  4. The container writes some data in the my-temp-data.txt file every 5 seconds

Apply the manifest to create the deployment:

kubectl apply -f my-deployment.yml

Step 2: Verify Deployment and Pods

# List deployments
kubectl get deployments

# List pods
kubectl get pods

Step 3: Verify Volume Mount and Data

Let's verify if the emptyDir volume was mounted in the container.

  1. Start a shell session inside the container:

    kubectl exec -it <pod-name> -- bash
  2. Verify if /data directory is present in the container:

    ls /data
  3. View the content of /data/my-temp-data.txt file:

    tail -f /data/my-temp-data.txt

Clean Up

Assuming your folder structure looks like the one below:

|-- manifests
│   |-- my-deployment.yml

Let's delete all the resources we created:

kubectl delete -f manifests/