apiVersion: apps/v1 kind: Deployment metadata: name: postgres spec: replicas: 1 selector: matchLabels: app: postgres template: metadata: labels: app: postgres spec: containers: - name: postgres image: postgres:15 env: - name: POSTGRES_DB value: calculator - name: POSTGRES_USER value: postgres - name: POSTGRES_PASSWORD value: yourpassword - name: PGDATA value: /var/lib/postgresql/data/pgdata # ← Keep this ports: - containerPort: 5432 volumeMounts: - mountPath: /var/lib/postgresql/data # ← CHANGE HERE (one level up) name: pgdata volumes: - name: pgdata persistentVolumeClaim: claimName: pgdata-pvc