# StorageClass specifically for CNPG (CloudNativePG) PostgreSQL clusters
# Fixes the "read-only filesystem" issue by mounting with postgres UID/GID
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: longhorn-cnpg
  namespace: longhorn-system
  annotations:
    storageclass.kubernetes.io/is-default-class: "false"
    # StorageClass.parameters is immutable. mkfsParams below was added after
    # this class already existed, so every sync failed with
    #   parameters: Invalid value: {...}: field is immutable
    # and the Application sat OutOfSync permanently — ArgoCD retrying a change
    # the API server can never accept.
    #
    # Replace=true makes ArgoCD delete and recreate instead of patching. Safe
    # for a StorageClass: it is consulted only at provisioning time, so bound
    # PVs and their data are untouched. New PVCs briefly fail if one is created
    # during the window.
    #
    # Note what this does NOT do: the nine CNPG volumes already provisioned were
    # formatted without mkfsParams and keep that format. Only volumes created
    # after this recreate get it. Existing volumes that need to expand still
    # need handling separately.
    argocd.argoproj.io/sync-options: Replace=true,Force=true
provisioner: driver.longhorn.io
allowVolumeExpansion: true
parameters:
  numberOfReplicas: "3"
  staleReplicaTimeout: "30"
  fromBackup: ""
  dataLocality: "best-effort"
  fsType: "ext4"
  # Mount options to ensure PostgreSQL can write
  mkfsParams: "-O ^64bit,^metadata_csum"
mountOptions:
  - "noatime"
  # Critical: mount with postgres UID/GID (26:26) to avoid permission issues
  - "uid=26"
  - "gid=26"
reclaimPolicy: Delete
volumeBindingMode: Immediate