I've just installed OpenShift-Okd 3.11, and am trying out a persistent Postgres database.

After attempting to create the database, I get the following error:

MountVolume.SetUp failed for volume "postgresql" : 
mount failed: exit status 32 Mounting command: systemd-run Mounting arguments: --description=Kubernetes transient mount for /var/lib/origin/openshift.local.volumes/pods/b76a314a-d59a-11e8-a502-6c626d58b24d/volumes/kubernetes.io~nfs/postgresql --scope -- mount -t nfs apps.mydomain.com:/pg-data /var/lib/origin/openshift.local.volumes/pods/b76a314a-d59a-11e8-a502-6c626d58b24d/volumes/kubernetes.io~nfs/postgresql Output: 
Running scope as unit run-7329.scope. mount.nfs: Protocol not supported

I have also create the following persistent volume:

apiVersion: v1
kind: PersistentVolume
metadata:
  name: postgresql 
spec:
  capacity:
    storage: 5Gi 
  accessModes:
  - ReadWriteOnce 
  nfs: 
    path: /pg-data 
    server: apps.mydomain.com 
  persistentVolumeReclaimPolicy: Retain

Even after creating the PV (using oc create -f pv.yml) I still get the above error.