NFS from AzureFile to OCP, usage in STS

working

2021-04-20

Content

Azure Storage Account

Follow steps on Azure and enable NFS on storageAccount
With NFS server enabled we need a provisioner, Openshift has no dynamic NFS provisioner (-OMG-).
For now I will step further and skip dynamic Persistence store definition and all PV will be created in advance.

BASE usage

[ openshift/PERSISTENCE/yaml/pv.yaml ]

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-pv0001
spec:
  storageClassName: ""
  capacity:
    storage: 5Gi
  accessModes:
  - ReadWriteMany
  nfs:
    path: //xxxnfsxxx/pokusnynfsshare
    server: xxxnfsxxx.file.core.windows.net
  persistentVolumeReclaimPolicy: Retain

[ openshift/PERSISTENCE/yaml/pvc.yaml ]

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nfs-claim1
spec:
  storageClassName: ""
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 5Gi
  volumeName: nfs-pv0001

STS usage

STS is little tricky.
StatefulSet will create it’s own PersistentVolumeClaim for each pod so you don’t have to create one yourself. A PersistentVolume and a PersistentVolumeClaim will bind exclusively one to one. Your PVC is binding to your volume so any PVCs created by the StatefulSet can’t bind to your volume so it won’t be used.

In your case your PersistentVolume and the StatefulSet below should do the trick. Make sure to delete the PersistentVolumeClaim you created so that it’s not bound to your PersistentVolume. Also, make sure the storage class name is set properly below on your PV and in volumeClaimTemplates on your StatefulSet below or the PVC made by the StatefulSet may not bind to your volume.

[ openshift/PERSISTENCE/yaml/storageclass.yaml ]

# dummy storage class, NFS store must be created manualy
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs-manualprovisioning
provisioner: nfsAzurefile

[ openshift/PERSISTENCE/yaml/sts-pv.yaml ]

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-testsub001
  labels:
    app: testsub
spec:
  storageClassName: "nfs"
  capacity:
    storage: 5Gi
  accessModes:
  - ReadWriteOnce
  nfs:
    path: //xxxnfsxxx/nfs-testsub001
    server: xxxnfsxxx.file.core.windows.net
    mountOptions:
      - nolock
  persistentVolumeReclaimPolicy: Delete
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-testsub002
  labels:
    app: testsub
spec:
  storageClassName: "nfs"
  capacity:
    storage: 5Gi
  accessModes:
  - ReadWriteOnce
  nfs:
    path: //xxxnfsxxx/nfs-testsub002
    server: xxxnfsxxx.file.core.windows.net
    mountOptions:
      - nolock
  persistentVolumeReclaimPolicy: Delete 
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-testsub003
  labels:
    app: testsub
spec:
  storageClassName: "nfs"
  capacity:
    storage: 5Gi
  accessModes:
  - ReadWriteOnce
  nfs:
    path: //xxxnfsxxx/nfs-testsub003
    server: xxxnfsxxx.file.core.windows.net
    mountOptions:
      - nolock
  persistentVolumeReclaimPolicy: Delete

[ openshift/PERSISTENCE/yaml/sts.yaml ]

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: testsub
spec:
  selector:
    matchLabels:
      app: testsub
  replicas: 3
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: testsub
    spec:
      containers:
      - name: testsub
        image: busybox:latest
        command: ["/bin/sh", "-c", "--"]
        args: ["while true; do sleep 30;done;"]
        volumeMounts:
        - name: "data"
          mountPath: /opt/nifi/data
          subPath: data
        - name: "data"
          mountPath: /opt/nifi/nifi-current/auth-conf/
          subPath: "auth-conf/bujaka"
        - name: "data"
          mountPath: /opt/nifi/flowfile_repository
          subPath: "flowfile_repository"
        - name: "data"
          mountPath: /opt/nifi/content_repository
          subPath: "content_repository"
        - name: "data"
          mountPath: /opt/nifi/provenance_repository
          subPath: "provenance_repository"
        - name: "data"
          mountPath: /opt/nifi/nifi-current/logs
          subPath: "logs"
        - name: "data"
          mountPath: /all
  volumeClaimTemplates:
  - metadata:
      name: data
    spec:
      selector:
        matchLabels:
          app: testsub
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "nfs"
      resources:
        requests:
          storage: 5G

STATE