Set volume mount user group and file permissions in kubernetes

Question

I'm using kops to run my kubernetes cluster. I'm trying to use an EBS volume with a container which is visible from my app by it shows it as read only because my app is not running as root. I want to use the PVC as a user other than root. I cannot find any control  by which I can change the user or group or file permissions for the mounted path.

My deployment YAML:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: notebook-1
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: notebook-1
    spec:
      volumes:
      - name: notebook-1
        persistentVolumeClaim:
          claimName: notebook-1
      containers:
      - name: notebook-1
        image: jupyter/base-notebook
        ports:
        - containerPort: 8888
        volumeMounts:
        - mountPath: "/home/jovyan/work"
          name: notebook-1

Answer 1

There's a setting in Pod Security Context called fsGroup. This will allow you to set the group ID that has the volume. example:

apiVersion: v1
kind: Pod
metadata:
  name: hello-world
spec:
  containers:
  # specification of the pod's containers
  # ...
  securityContext:
    fsGroup: 1234

More info: https://kubernetes.io/docs/concepts/policy/security-context/

For further details, refer to the Kubernetes Course.