Question

Difference between block storage and persistent volume

Is there a difference between DO’s block storage and a standard persistent volume in k8s? based on my reading it seems there is. SO for example if I add a PV using the following config:

apiVersion: v1
kind: PersistentVolume # Create PV
metadata:
  name: postgres-volume # Sets PV name
  labels:
    type: local # Sets PV's type
    app: postgres
spec:
  storageClassName: manual
  capacity:
    storage: 2Gi # Sets PV's size
  accessModes:
    - ReadWriteMany
  hostPath:
    path: "/data/postgresql" # Sets PV's host path

And then proceed to delete the Node then this PV will also be deleted right? But if I was to create the PV using DO’s block storage, would that persist even if node was destroyed?

i.e with:

apiVersion: v1
kind: PersistentVolume # Create PV
metadata:
  name: postgres-volume # Sets PV name
  labels:
    type: local # Sets PV's type
    app: postgres
spec:
  storageClassName: do-block-storage # DIFF HERE
  capacity:
    storage: 2Gi # Sets PV's size
  accessModes:
    - ReadWriteMany
  hostPath:
    path: "/data/postgresql" # Sets PV's host path
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Bobby Iliev
Site Moderator
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• October 17, 2022

Hi there,

Yes, this sounds is correct, if you just create a PV, the data will be stored directly on the node itself. However, if you use a block storage, you would actually spin up new volume which would then be attached to one of your Kubernetes nodes.

Hope that this helps!

Best,

Bobby