I have multi node kubernetes setup. I am trying to allocate a Persistent volume dynamically using storage classes with NFS volume plugin. I found storage classes examples for glusterfs, aws-ebs, etc.but, I didn't find any example for NFS. If I create PV and PVC only then NFS works very well(Without storage class). I tried to write storage class file for NFS, by referring other plugins. please refer it below,
nfs-storage-class.yaml
kind: StorageClass
apiVersion: storage.k8s.io/v1beta1
metadata:
namespace: kube-system
name: my-storage
annotations:
storageclass.beta.kubernetes.io/is-default-class: "true"
labels:
kubernetes.io/cluster-service: "true"
provisioner: kubernetes.io/nfs
parameters:
path: /nfsfileshare
server: <nfs-server-ip>
nfs-pv-claim.yaml
apiVersion: v1
metadata:
name: demo-claim
annotations:
volume.beta.kubernetes.io/storage-class: my-storage
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 3Gi
It didn't worked. So, my question is, Can we write a storage class for NFS? Does it support dynamic provisioing?
Dynamic storage provisioning using NFS doesn't work, better use glusterfs. There's a good tutorial with fixed to common problems while setting up. http://blog.lwolf.org/post/how-i-deployed-glusterfs-cluster-to-kubernetes/
I also tried to enable the NFS provisioner on my kubernetes cluster and at first it didn't work, because the quickstart guide does not mention that you need to apply the rbac.yaml as well (I opened a PR to fix this).
The nfs provisioner works fine for me if I follow these steps on my cluster: https://github.com/kubernetes-incubator/external-storage/tree/master/nfs#quickstart
$ kubectl create -f deploy/kubernetes/deployment.yaml
$ kubectl create -f deploy/kubernetes/rbac.yaml
$ kubectl create -f deploy/kubernetes/class.yaml
Then you should be able to create PVCs like this:
$ kubectl create -f deploy/kubernetes/claim.yaml
You might want to change the folders used for the volume mounts in deployment.yaml
to match it with your cluster.
I'm looking into doing the same thing. I found https://github.com/kubernetes-incubator/external-storage/tree/master/nfs, which I think you based your provisioner on?
I think an nfs provider would need to create a unique directory under the path defined. I'm not really sure how this could be done.
Maybe this is better of as an github issue on the kubernetes repo.
The purpose of StorageClass
is to create storage, e.g. from cloud providers (or "Provisioner" as they call it in the kubernetes docs). In case of NFS you only want to get access to existing storage and there is no creation involved. Thus you don't need a StorageClass
. Please refer to this blog.