CODEWITHSUNDEEP
google-kubernetes-engine
user20690142
user20690142

Reputation: 1

Technical details on where GKE persistent volumes

can anyone provide technical details on where GKE persistent volumes are actually stored and what happens in case a node goes down on Google Kubernetes Engine?

Google provides documentation on the use but not on annotations, I need to know whether for any reason the PV might be stored on the node hosting the pod itself

Upvotes: 0

Views: 104

Answers (1)

Reid123
Reid123

Reputation: 274

When the node goes down or is deleted, the GKE persistent volume will be deleted as well. This is because the default storageclass in GKE is set to ReclaimPolicy: Delete

You can run the command kubectl get sc to check the storageclasses and describe the storageclass by running the command kubectl describe sc standard-rwo

Read this link for more information about Persistent volumes and dynamic provisioning.

If you want to retain your Persistent volumes when the node goes down or is deleted. You can create your storageclass and set ReclaimPolicy: Retain, see example below:

StorageClass

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: mystorageclass
provisioner: kubernetes.io/gce-pd
parameters:
  type: pd-standard
  fstype: ext4
  replication-type: none
reclaimPolicy: Retain

Then create PVC to automatically provision your Persistent volumes and use it in your deployment. See example of PVC below:

PersistentVolumeClaims

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mypvc
spec:
  accessModes:
    - ReadWriteOnce
  volumeMode: Filesystem
  resources:
    requests:
      storage: 8Gi
  storageClassName: mystorageclass

Upvotes: 3

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