How to create an kubernetes NFS volume on Google Container Engine - kubernetes

Question

I am trying to create a kubernetes NFS volume on Google Container Engine (GKE) and get it used by a deployment.
I did this in several steps as it shown in this github repository kubernetes-nfs-volume-on-gke:
Create a GKE cluster and GCE persistent disk
Config the context for the kubectl to deal with the GKE cluster
Creation of the PersistentVolume (PV) and the PersistentVolumeClaim (PVC)
Creation of an NFS server
Create a service for the NFS server to expose it (the IP address of that service is used for the creation of the NFS PV and NFS PVC)
Creation of NFS volume
Create a Deployment of a busybox for checking the NFS volume is accessible.
After fellowing these step, this is the obtained error:
$ kubectl describe pods nfs-busybox-2762569073-lhb5p
Name: nfs-busybox-2762569073-lhb5p
Namespace: default
Node: gke-mappedinn-cluster-default-pool-f94cb0d4-fmfb/10.240.0.3
Start Time: Wed, 12 Apr 2017 04:12:20 +0400
Labels: name=nfs-busybox
pod-template-hash=2762569073
Annotations: kubernetes.io/created-by={"kind":"SerializedReference","apiVersion":"v1","reference":{"kind":"ReplicaSet","namespace":"default","name":"nfs-busybox-2762569073","uid":"b1e523ae-1f14-11e7-a084-42010a8e0...
kubernetes.io/limit-ranger=LimitRanger plugin set: cpu request for container busybox
Status: Pending
IP:
Controllers: ReplicaSet/nfs-busybox-2762569073
Containers:
busybox:
Container ID:
Image: busybox
Image ID:
Port:
Command:
sh
-c
while true; do date > /mnt/index.html; hostname >> /mnt/index.html; sleep $(($RANDOM % 5 + 5)); done
State: Waiting
Reason: ContainerCreating
Ready: False
Restart Count: 0
Requests:
cpu: 100m
Environment: <none>
Mounts:
/mnt from my-pvc-nfs (rw)
/var/run/secrets/kubernetes.io/serviceaccount from default-token-20n4b (ro)
Conditions:
Type Status
Initialized True
Ready False
PodScheduled True
Volumes:
my-pvc-nfs:
Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
ClaimName: nfs
ReadOnly: false
default-token-20n4b:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-20n4b
Optional: false
QoS Class: Burstable
Node-Selectors: <none>
Tolerations: <none>
Events:
FirstSeen LastSeen Count From SubObjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
5m 5m 1 default-scheduler Normal Scheduled Successfully assigned nfs-busybox-2762569073-lhb5p to gke-mappedinn-cluster-default-pool-f94cb0d4-fmfb
3m 48s 2 kubelet, gke-mappedinn-cluster-default-pool-f94cb0d4-fmfb Warning FailedMount Unable to mount volumes for pod "nfs-busybox-2762569073-lhb5p_default(b1e7c901-1f14-11e7-a084-42010a8e0116)": timeout expired waiting for volumes to attach/mount for pod "default"/"nfs-busybox-2762569073-lhb5p". list of unattached/unmounted volumes=[my-pvc-nfs]
3m 48s 2 kubelet, gke-mappedinn-cluster-default-pool-f94cb0d4-fmfb Warning FailedSync Error syncing pod, skipping: timeout expired waiting for volumes to attach/mount for pod "default"/"nfs-busybox-2762569073-lhb5p". list of unattached/unmounted volumes=[my-pvc-nfs]
37s 37s 1 kubelet, gke-mappedinn-cluster-default-pool-f94cb0d4-fmfb Warning FailedMount MountVolume.SetUp failed for volume "kubernetes.io/nfs/b1e7c901-1f14-11e7-a084-42010a8e0116-nfs" (spec.Name: "nfs") pod "b1e7c901-1f14-11e7-a084-42010a8e0116" (UID: "b1e7c901-1f14-11e7-a084-42010a8e0116") with: mount failed: exit status 32
Mounting command: /home/kubernetes/bin/mounter
Mounting arguments: 10.247.250.208:/exports /var/lib/kubelet/pods/b1e7c901-1f14-11e7-a084-42010a8e0116/volumes/kubernetes.io~nfs/nfs nfs []
Output: Running mount using a rkt fly container
run: group "rkt" not found, will use default gid when rendering images
In the kubernetes dashboard, the error is as follows:
Unable to mount volumes for pod "nfs-busybox-2762569073-lhb5p_default(b1e7c901-1f14-11e7-a084-42010a8e0116)": timeout expired waiting for volumes to attach/mount for pod "default"/"nfs-busybox-2762569073-lhb5p". list of unattached/unmounted volumes=[my-pvc-nfs]
Error syncing pod, skipping: timeout expired waiting for volumes to attach/mount for pod "default"/"nfs-busybox-2762569073-lhb5p". list of unattached/unmounted volumes=[my-pvc-nfs]
Have I missed something?
Thanks,

Answer 1

This comment in the issue on kubernetes seems to solve this NFS issue on GKE.
Qutoing that comment:
Edit examples/volumes/nfs/nfs-pv.yaml change the last line to path: "/".
Edit examples/volumes/nfs/nfs-server-rc.yaml change the image to the one that enabled NFSv4 image: gcr.io/google_containers/volume-nfs:0.8
Also there are other issues where this is tracked here and here.