Volumes

Flow diagram

depl.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80
        volumeMounts: #Mounting the volume to the pod
        - name: nginx-persistent-storage
          mountPath: /usr/share/nginx/html
      volumes:
      - name: nginx-persistent-storage
        persistentVolumeClaim:
          claimName: nginx-pvc #Selecting the pvc we want to refer here

volumes.yml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nginx-pv
spec:
  capacity:
    storage: 500Mi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-storage-example #className we specified in pvc
  local:
    path: /usr/share/nginx/html
  nodeAffinity:
    required:
      nodeSelectorTerms:
        - matchExpressions:
            - key: kubernetes.io/hostname
              operator: In
              values:
              - nodel

volume-claim.yml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nginx-pvc #Name that we referred into deployment file
spec:
  volumeName: nginx-pv
  storageClassName: local-storage-example #A claim can request a particular class by specifying the name of a StorageClass using the attribute storageClassName. Only PVs of the requested class, ones with the same storageClassName as the PVC, can be bound to the PVC.
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 500Mi