I'm currently mounting a gcePersistentDisk to each pod in my kubernetes deployment. Since I want multiple pods to read from the disk, I have to mount it as read only. My deployment yaml file looks like this:

apiVersion: extensions/v1beta1
kind: Deployment
spec:
  replicas: 1
  ...
  ...
  template:
    ...
    ...
    spec:
      containers:
      - image: ...
        ...
        ...
        volumeMounts:
          - mountPath: /my-volume
            name: my-volume
            readOnly: true
      ...
      ...
      volumes:
      - name: my-storage
        gcePersistentDisk:
          pdName: my-disk
          fsType: ext4
          readOnly: true

Right now, in order to write new stuff to the disk, I need to scale the deployment to 0, then start a kubernetes job that mounts the disk to a single pod that has read / write access, write to the disk and then scale the deployment up again.

Is there a way I can do this without taking down all my pods? Is it possible/recommended to do something like "hot-swapping" persistent disks in kubernetes deployments?