I am deploying a stateful application in K8S.

Before that Im trying to implement an example.

Before deploying my-sql in my cluster, I have created a pv and a pvc.

kind: PersistentVolume
apiVersion: v1
metadata:
  name: mysql-pv-volume
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 20Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pv-claim
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 20Gi

At this point in time, I have not edit or created any new StorageClass.

I then go on to deploy the application using a volumeMount in my deployment.

.
.
       volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-pv-claim

I bring up the application successfully and, take it down (first the pod and the the deployment) and bring back the application and notice that my application data persists under /var/lib/mysql

I later on noticed that /mnt/data does NOT exist on my host machine. I am working in minikube.

I looked into the storage class and it seems to be using :

StorageClass:    manual

But if I check all my storage classes, I see only this one :

# kubectl describe storageclass
Name:            standard
IsDefaultClass:  Yes
Annotations:     kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"storage.k8s.io/v1","kind":"StorageClass","metadata":{"annotations":{"storageclass.beta.kubernetes.io/is-default-class":"true"},"labels":{"addonmanager.kubernetes.io/mode":"Reconcile"},"name":"standard","namespace":""},"provisioner":"k8s.io/minikube-hostpath"}
,storageclass.beta.kubernetes.io/is-default-class=true
Provisioner:           k8s.io/minikube-hostpath
Parameters:            <none>
AllowVolumeExpansion:  <unset>
MountOptions:          <none>
ReclaimPolicy:         Delete
VolumeBindingMode:     Immediate
Events:                <none>

But the one that my-sql is using is not there.

I need help in understanding this please. Where is the PV /mnt/data ?

On my host machine the result to look for /mnt/data is :

# cd /mnt/data
cd: no such file or directory: /mnt/data