NFS Server Provisioner on K8S

Another dynamic storage provisioner from Quay. NFS server inside K8S for bare-metal/on-premise kubernetes cluster.

https://github.com/kubernetes-incubator/external-storage/tree/master/nfs

nfs-common and nfs-utils need to be installed on kubelet, otherwise error log might include: 

• bad option; for several filesystems (e.g. nfs, cifs) you might need a /sbin/mount.<type> helper program.
• Warning  FailedMount  24m  kubelet, MountVolume.SetUp failed for volume "pvc-2c49da00-3431-4e3c-a1cc-84d1daa4a6ab" : mount failed: exit status 32

In case there is error: pod has unbound immediate PersistentVolumeClaims, it has nothing with storage provision, which just indicates that pod does not not have storage class defined in manifest file or K8S doesn't have default storage class.

To set up default storage class in kubernetes:

• kubectl patch storageclass storage-class-name -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'