Understanding and Verifying Volume Mounts in Kubernetes Pods

Introduction:

2 min readDec 16, 2023

In Kubernetes, volume mounts play a crucial role in providing persistent storage to containers. They enable data to be shared between containers and persist even if a pod is rescheduled or moved. This article will guide you through the process of creating volume mounts inside a Kubernetes pod and how to verify that the volume directory has been successfully created.

Step 1: Define a PersistentVolume and PersistentVolumeClaim

Before creating volume mounts, you need to define a PersistentVolume (PV) and a PersistentVolumeClaim (PVC). The PV represents a piece of storage in the cluster, while the PVC is a request for storage by a pod.

PersistentVolume and PersistentVolumeClaim

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


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

Step 2: Create a Pod with Volume Mounts

Next, create a pod that uses the PVC created in Step 1 for volume mounts.

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: my-container
    image: your-image:tag
    volumeMounts:
    - name: my-volume
      mountPath: /path/in/container
  volumes:
  - name: my-volume
    persistentVolumeClaim:
      claimName: my-pvc

Step 3: Verify Volume Directory Inside the Pod

Now that the pod is running, you can verify that the volume directory has been successfully mounted inside the pod.

kubectl exec -it my-pod -- ls /path/in/container

This command will log into the pod interactively and list the contents of the volume directory.

Conclusion:

Volume mounts in Kubernetes are a powerful feature for providing persistent storage to pods. By following the steps outlined in this article, you can create volume mounts, verify their presence inside the pod, and ensure that your applications have access to the required data.

Remember to adjust the paths, names, and sizes according to your specific use case. Volume mounts are essential for scenarios where data persistence and sharing are critical aspects of your application deployment.

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