1. Following is the docker image that I am using

FROM ubuntu:18.04
RUN adduser --system --quiet --shell=/bin/bash --home=/opt/bob --gecos 'bob' --group bob
RUN apt-get update && apt-get upgrade -y
RUN mkdir /var/lib/bob
RUN chown bob:bob /opt/bob -R && chown bob:bob -R /var/lib/bob
USER bob
CMD ["touch", "/var/lib/bob/Demofile.txt"]

2. Created a DigitalOcean Block Storage

3. Spinup Kubernetes cluster with following deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: cubuntu
spec:
  selector:
    matchLabels:
      app: cubuntu
  template:
    metadata:
      labels:
        app: cubuntu
    spec:
      containers:
      - name: cubuntu
        image: registry.gitlab.com/username/cubuntu:latest
        securityContext:
          privileged: true
        volumeMounts:
        - mountPath: "/var/lib/bob"
          name: do-block-storage
      volumes:
        - name: do-block-storage
          persistentVolumeClaim:
            claimName: bob-pv-claim

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: bob-pv-volume
spec:
  storageClassName: do-block-storage
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/var/bob-pv-volume"


---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: bob-pv-claim
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
  storageClassName: do-block-storage

4. In the logs, got the following

touch: cannot touch '/var/lib/bob/Demofile.txt': Permission denied