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fsGroup Support on NFS protocol

fsGroupPolicy feature is supported from Kubernetes 1.20, default CSI driver installation does not have this feature, follow below steps to enable this feature. Please note that blobfuse does not support fsGroupPolicy yet, only NFS protocol supports fsGroup.

Option#1: Enable fsGroupPolicy support in driver helm installation

add --set feature.fsGroupPolicy=File in helm installation command.

Option#2: Enable fsGroupPolicy support on a cluster with CSI driver already installed

kubectl delete CSIDriver blob.csi.azure.com
cat <<EOF | kubectl create -f -
apiVersion: storage.k8s.io/v1
kind: CSIDriver
metadata:
  name: blob.csi.azure.com
spec:
  attachRequired: false
  podInfoOnMount: true
  fsGroupPolicy: File
  volumeLifecycleModes:
    - Persistent
    - Ephemeral
EOF