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CSI NFS Export Driver (EXPERIMENTAL)

Note: This repo is in PoC stage

Overview

  1. This goal is to provide a "per-volume" NFS export for PersistentVolumes, both dynamically and statically.

  2. Use an NFS-Ganesha Pod to export NFS

  3. Use ClusterIP to mount NFS

  4. Use CSI NFS Mounter instead of intree NFS volume

Data Flow

Data Plane

Highlights

  1. Support Static Provisioning
  2. Bind mount the local path on the data node
  3. Implement controller.kubernetes.io/pod-deletion-cost
  4. Delete NFS Pod and NFS SVC when NFS PVC is completely umounted
  5. Implement NFS Clients Filter for NFS security (Ganesha only)

How to deploy

$ kubectl apply -f deploy/

$ kubectl get pod -l nfs-export.csi.k8s.io/server
NAME                                        READY   STATUS    RESTARTS   AGE
csi-nfs-export-controller-79f987457-t8rzt   3/3     Running   0          16m
csi-nfs-export-node-5h5cj                   3/3     Running   0          16m
csi-nfs-export-node-mgldw                   3/3     Running   0          16m
csi-nfs-export-node-272q7                   3/3     Running   0          16m

How to Use

Create StorageClass

By default, the default storage class with be used as DataStorageClass, here we use Rancher's local-path-provisioner as an example.

$ $ kubectl annotate sc local-path storageclass.kubernetes.io/is-default-class=true
storageclass.storage.k8s.io/local-path annotated

$ kubectl get sc local-path
NAME                   PROVISIONER              RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
local-path (default)   rancher.io/local-path    Delete          WaitForFirstConsumer   false                  5d20h

$ kubectl apply -f example/storageclass.yaml

$ kubectl get sc nfs-export-csi
NAME             PROVISIONER             RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
nfs-export-csi   nfs-export.csi.k8s.io   Delete          Immediate           false                  38s

Create PVC

A DataPVC names nfs-<uuid> will be created together with the PVC.

$ kubectl apply -f example/pvc-dynamic.yaml

$ kubectl get pvc
NAME                                       STATUS    VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS      AGE
pvc-nfs-export-dynamic                     Bound     pvc-8474696b-1a51-4e9b-ab54-105f5ce2cb10   1Gi        RWX            nfs-export-csi    5s                                                                       piraeus-local-dflt-r2   12s
nfs-8474696b-1a51-4e9b-ab54-105f5ce2cb10   Pending                                                                        local-path        3s

Attach and Mount PV

An 'NFSPod' and an 'NFSService', both named nfs-<uuid>, will be created to export NFS.

$ kubectl apply -f example/deployment-dynamic.yaml

$ kubectl get pod
NAME                                         READY   STATUS    RESTARTS   AGE
nfs-6c7cb3fe-385a-4f31-9dfb-b52bfb0f1702-0   1/1     Running   0          5m16s
deployment-nginx-dynamic-7d6cf76c6f-tcrrd    1/1     Running   0          5m17s
deployment-nginx-dynamic-7d6cf76c6f-nbdbh    1/1     Running   0          5m17s
deployment-nginx-dynamic-7d6cf76c6f-hr9xj    1/1     Running   0          5m17s

$ kubectl get svc
NAME                                       TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                    AGE
nfs-6c7cb3fe-385a-4f31-9dfb-b52bfb0f1702   ClusterIP   10.152.183.11   <none>        2049/TCP,111/TCP,111/UDP   2m42s