Sử dụng PV/PVC và tạo Pod dùng longhorn storage class

echo '''
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: longhorn-pvc-delete
spec:
  accessModes:
    #- ReadWriteOnce
    - ReadWriteMany
  storageClassName: longhorn-storage-delete
  resources:
    requests:
      storage: 2Gi
''' > longhorn-pvc-delete.yaml

$ kubectl apply -f longhorn-pvc-delete.yaml
persistentvolumeclaim/longhorn-pvc-delete created

$ kubectl get pvc/longhorn-pvc-delete
NAME                  STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS              AGE
longhorn-pvc-delete   Bound    pvc-55160799-bbb1-4661-8c98-1deb9a729788   2Gi        RWX            longhorn-storage-delete   3m38s

echo '''
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: longhorn-pvc-retain
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: longhorn-storage-retain
  resources:
    requests:
      storage: 2Gi
''' > longhorn-pvc-retain.yaml

$ kubectl apply -f longhorn-pvc-retain.yaml 
persistentvolumeclaim/longhorn-pvc-retain created

$ kubectl get pvc/longhorn-pvc-retain
NAME                  STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS              AGE
longhorn-pvc-retain   Bound    pvc-490aa0ab-1920-4520-accd-2316169d667c   2Gi        RWO            longhorn-storage-retain   116s

cat > ./test-pod-longhorn-delete.yaml << OEF
kind: Pod
apiVersion: v1
metadata:
  name: pod-longhorn-delete
spec:
  volumes:
        - name: longhorn-pvc-delete
          persistentVolumeClaim:
            claimName: longhorn-pvc-delete
  containers:
    - name: my-container
      volumeMounts:
        - name: longhorn-pvc-delete # This is the name of the volume we set at the pod level
          mountPath: /var/simple # Where to mount this directory in our container

      # Now that we have a directory mounted at /var/simple, let's
      # write to a file inside it!
      image: alpine
      command: ["/bin/sh"]
      args: ["-c", "while true; do date >> /var/simple/file.txt; sleep 5; done"]
OEF

$ kubectl apply -f test-pod-longhorn-delete.yaml
pod/pod-longhorn-delete created

cat > ./test-pod-longhorn-retain.yaml << OEF
kind: Pod
apiVersion: v1
metadata:
  name: pod-longhorn-retain
spec:
  volumes:
        - name: longhorn-pvc-retain
          persistentVolumeClaim:
            claimName: longhorn-pvc-retain
  containers:
    - name: my-container
      volumeMounts:
        - name: longhorn-pvc-retain # This is the name of the volume we set at the pod level
          mountPath: /var/simple # Where to mount this directory in our container

      # Now that we have a directory mounted at /var/simple, let's
      # write to a file inside it!
      image: alpine
      command: ["/bin/sh"]
      args: ["-c", "while true; do date >> /var/simple/file.txt; sleep 5; done"]
OEF

$ kubectl apply -f test-pod-longhorn-retain.yaml
pod/pod-longhorn-retain created

$ kubectl get pods
NAME                  READY   STATUS              RESTARTS   AGE
pod-longhorn-delete   1/1     Running             0          10m
pod-longhorn-retain   1/1     Running             0          9m57s