How to Write File from PersistentVolumeClaims in SpringBoot

Question

I have a NFS server, It can access nfs server with kubernetes Storageclass. I want to write and read File from my Spring Boot project to nfs server. how can I do that?

pv.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: fileserver-nfs-pv
spec:
  capacity:
    storage: 2Gi
  accessModes:
    - ReadWriteMany
  claimRef:
    apiVersion: v1
    kind: PersistentVolumeClaim
    name: fileserver-nfs-pvc
  nfs:
    server: 10.0.75.1
    path: /export/k8s-data/fileserver

pvc.yaml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: fileserver-nfs-pvc
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 2Gi

My spring boot project deployment yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: authentication
  name: authentication
  namespace: auth
spec:
  selector:
    matchLabels:
      app: authentication
  strategy:
    rollingUpdate:
      maxSurge: 15%
      maxUnavailable: 0
    type: RollingUpdate
  replicas: 1
  template:
    metadata:
      labels:
        app: authentication
    spec:
      containers:
        - name: authentication
          image: ip:8080/authentication:0.0.0
          imagePullPolicy: Always
          ports:
            - containerPort: 8080
          resources:
            limits:
              cpu: "0.9"
              memory: 1Gi
            requests:
              cpu: "0.6"
              memory: 512Mi
   

My spring boot project is kubernetese deploy. I want to read and write to nfs server using java.nio package. How should I define my deployment.yaml file?

Answer 1

After creating PersistentVolumeClaim and PersistentVolume, adding

volumeMounts:
- mountPath: /dms
  name: nfs-pvc-volume 

and

volumes:
- name: nfs-pvc-volume
  persistentVolumeClaim:
    claimName: dms-auth-nfs-pvc

commands to my deployment.yaml file solved my problem.

deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: authentication
  name: authentication
  namespace: auth
spec:
  selector:
    matchLabels:
      app: authentication
  strategy:
    rollingUpdate:
      maxSurge: 15%
      maxUnavailable: 0
    type: RollingUpdate
  replicas: 1
  template:
    metadata:
      labels:
        app: authentication
    spec:
      containers:
        - name: authentication
          image: ip:8080/authentication:0.0.0
          imagePullPolicy: Always
          ports:
            - containerPort: 8080
          resources:
            limits:
              cpu: "0.9"
              memory: 1Gi
            requests:
              cpu: "0.6"
              memory: 512Mi
          volumeMounts:
          - mountPath: /dms
            name: nfs-pvc-volume
      volumes:
        - name: nfs-pvc-volume
          persistentVolumeClaim:
            claimName: dms-auth-nfs-pvc

I created PersistentVolumeClaim and PersistentVolume on kubernetes

PersistentVolumeClaim

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: dms-auth-nfs-pvc
  namespace: auth
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 30Gi

PersistentVolume

apiVersion: v1
kind: PersistentVolume
metadata:
  name: dms-auth-nfs-pv
spec:
  capacity:
    storage: 30Gi
  accessModes:
    - ReadWriteMany
  claimRef:
    apiVersion: v1
    kind: PersistentVolumeClaim
    name: dms-auth-nfs-pvc
  nfs:
    server: nfs:ip
    path: /dms