Kubernetes NFS Mount Options

Question

I've recently started using NFS volumes for my clusters on-prem. This is the simplest and best solution for me, however it seems pretty limited in regards to the actual mounts options.

Is there anyway to set mount options on the node/cluster in the volume.yml files?

• NFSv3
• NFSv4/4.1
• lookupcache
• noatime
• rsize,wsize

I have application that requires a specific version and also these mount options for performance.

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs
spec:
  capacity:
    storage: 1Mi
  accessModes:
    - ReadWriteMany
  nfs:
    # FIXME: use the right IP
    server: 10.244.1.4
    path: "/"

Is there anyway to add mount flags here?

Answer 1

If someone is looking for answers in 2021, here is what is working for me.

  mountOptions:
    - hard
    - timeo=600
    - retrans=3
    - proto=tcp
    - nfsvers=4.2
    - port=2050
    - rsize=4096
    - wsize=4096
    - noacl
    - nocto
    - noatime
    - nodiratime

Answer 2

It is possible and it's been GA in Kubernetes since 1.8.

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv0003
spec:
  capacity:
    storage: 5Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: slow
  mountOptions:
    - hard
    - nfsvers=4.1
  nfs:
    path: /tmp
    server: 172.17.0.2

https://kubernetes.io/docs/concepts/storage/persistent-volumes/#mount-options

https://github.com/kubernetes/enhancements/issues/168#issuecomment-317748159