apiVersion: v1
kind: PersistentVolume
metadata:
  name: db-pv
  namespace: myapp
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: db
  namespace: myapp
spec:
  serviceName: "db"
  replicas: 1
  selector:
    matchLabels:
      app: db
  template:
    metadata:
      labels:
        app: db
    spec:
      containers:
        - name: postgres
          image: postgres:15
          ports:
            - containerPort: 5432
          env:
            - name: POSTGRES_USER
              value: "user"
            - name: POSTGRES_PASSWORD
              value: "password"
            - name: POSTGRES_DB
              value: "mydb"
          volumeMounts:
            - name: db-storage
              mountPath: /var/lib/postgresql/data
  volumeClaimTemplates:
    - metadata:
        name: db-storage
      spec:
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 1Gi