Initializing a dynamically provisioned shared volume with ReadOnlyMany access mode-CodePudding

My GKE deployment consists of N pods (possibly on different nodes) and a shared volume, which is dynamically provisioned by pd.csi.storage.gke.io and is a Persistent Disk in GCP. I need to initialize this disk with data before the pods go live.

My problem is I need to set accessModes to ReadOnlyMany and be able to mount it to all pods across different nodes in read-only mode, which I assume effectively would make it impossible to mount it in write mode to the initContainer.

Is there a solution to this issue? Answer to this question suggests a good solution for a case when each pod has their own disk mounted, but I need to have one disk shared among all pods since my data is quite large.

CodePudding user response：

...I need to have one disk shared among all pods

You can try Filestore. First your create a FileStore instance and save your data on a FileStore volume. Then you install FileStore driver on your cluster. Finally you share the data with pods that needs to read the data using a PersistentVolume referring the FileStore instance and volume above.

CodePudding user response：

With GKE 1.21 and later, you can enable the managed Filestore CSI driver in your clusters. You can enable the driver for new clusters

gcloud container clusters create CLUSTER_NAME \
    --addons=GcpFilestoreCsiDriver ...

or update existing clusters:

gcloud container clusters update CLUSTER_NAME \
   --update-addons=GcpFilestoreCsiDriver=ENABLED

Once you've done that, create a storage class (or have or platform admin do it):

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: filestore-example
provisioner: filestore.csi.storage.gke.io
volumeBindingMode: WaitForFirstConsumer
allowVolumeExpansion: true
parameters:
  tier: standard
  network: default

After that, you can use PVCs and dynamic provisioning:

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: podpvc
spec:
  accessModes:
  - ReadWriteMany
  storageClassName: filestore-example
  resources:
    requests:
      storage: 1Ti