apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: blog-db
  namespace: myapp-namespace
spec:
  serviceName: "blog-db-service"
  replicas: 1
  selector:
    matchLabels:
      app: blog-db
  template:
    metadata:
      labels:
        app: blog-db
    spec:
      containers:
      - name: postgres
        image: postgres:13
        ports:
        - containerPort: 5432
        env:
        - name: POSTGRES_DB
          value: "blogdb"
        - name: POSTGRES_USER
          value: "admin"
        - name: POSTGRES_PASSWORD
          value: "password"
        volumeMounts:
        - name: postgres-storage
          mountPath: /var/lib/postgresql/data
          subPath: pgdata 
  volumeClaimTemplates:
  - metadata:
      name: postgres-storage
    spec:
      accessModes: ["ReadWriteOnce"]
      resources:
        requests:
          storage: 1Gi