How to make sure that Kyma persistent storage is mounted correctly?

[hagarnabil]

Hi everyone,

I've deployed mysql with persistent storage but I don't know how to make sure if my data is really mounted correctly. These are my files,

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql
spec:
  selector:
    matchLabels:
      app: mysql
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - image: hagarrnabil/mysql
        name: mysql
        env:
            - name: MYSQL_ROOT_PASSWORD
              value: P@ssword
            - name: MYSQL_DATABASE
              value: mysql
            - name: MYSQL_USER
              value: admin
            - name: MYSQL_PASSWORD
              value: P@ssword        
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-pv-claim
---
apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  ports:
  - port: 3306
  selector:
    app: mysql

apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv-volume
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pv-claim
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: manual
provisioner: kubernetes.io/aws-ebs
parameters:
  type: gp2
reclaimPolicy: Retain
allowVolumeExpansion: true
mountOptions:
  - debug
volumeBindingMode: Immediate

Thanks in advance!

[gabbi]

Hi Hagar Nabil,

A few comments.

• You do not need to define Persistent Volume and Storage Class
• Only Persistent Volume Claim should suffice. You should use the default storage class.
• You can verify that the data is persisted by restarting the pod and verifying the data is still there.

Please check this sample for reference: https://github.com/SAP-samples/kyma-runtime-extension-samples/tree/main/database-mssql

I would recommend reading about Kubernetes Persistent volume claims and dynamic provisioning.

BR

Gaurav