can i make a volume on GKE (with autopilot) that can use ReadWritemany?

Question

I'm currently trying to create a GKE cluster and would like to be able to scale my PostgreSQL pods beyond 1 active instance but I'm getting stuck on the read-write permission of my volume is there a way to get readwritemany to work in GKE autopilot? a hot spare for my PostgreSQL pod would also be helpful if that is possible. thank you for the advice in advance.

Answer 1

IIUC you're unable to use Google's (Compute Engine's) Persistent Disks as ReadWriteMany. This may be documented on cloud.google.com but I was unable to find it.

See Kubernetes' documentation for Access Modes and specifically GCEPersistentDisk . These support ReadWriteOnce and ReadOnlyMany but not ReadWriteMany .

There may be other ways but, one (Goole-supported) way you can get ReadWriteMany on GCP is to use Filestore. See Using the Filestore CSI driver .

For completeness (!) another way would be to use a PostgreSQL service such as Cloud SQL for PostgreSQL

Answer 2

Compute engine persistent disk does not support ReadWriteMany access mode.

GKE Autopilot cluster supports StorageType "NFS" and by default installed with Filestore CSI addon . It is important that you do not perform nfs mount in your container because Autopilot will reject privileged pod, see here for a quick guide how to use it and how much it can cost you.