apiVersion: apps/v1
kind: Deployment
metadata: 
  name: mysql-server
spec: # spec deployment
  replicas: 1
  selector:
    matchLabels:
      app: mysql-server
      tier: db
  template: # ref POD
    metadata:
      labels: 
        app: mysql-server
        tier: db
    spec: # spec POD
        containers:
        - image: mysql:5.7
          name: mysql-server
          args:
            - "--ignore-db-dir=lost+found"
          env:
          - name: MYSQL_ROOT_PASSWORD
            valueFrom:
              secretKeyRef:
                name: mysql-pass 
                key: password
          ports:
          - containerPort: 3306
          volumeMounts:
          - name: mysql-persistent-storage
            mountPath: /var/lib/mysql
        
        volumes:
        - name: mysql-persistent-storage
          persistentVolumeClaim:
            claimName: mysql-pv-claim