---  
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  namespace: demo
  labels:
    app: nginx
spec:
  replicas: 1
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      imagePullSecrets:
        - name: regcred
      containers:
      - name: nginx
        image: docker.io/nginx:1.23.3
        ports:
        - containerPort: 80
        volumeMounts:
          - name: demo-data
            mountPath: /data
      volumes:
        - name: demo-data
          persistentVolumeClaim:
            claimName: demo-pvc
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: postgres-config-demo
  namespace: demo
  labels:
    app: postgres
data:
  POSTGRES_DB: demopostgres
  POSTGRES_USER: demopostgres
  POSTGRES_PASSWORD: password123!
---
apiVersion: v1
kind: Service
metadata:
  name: postgres
  namespace: demo
  labels:
    app: postgres
spec:
  ports:
  - port: 5432
    name: postgres
  clusterIP: None
  selector:
    app: postgres
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgres-demo
  namespace: demo
spec:
  serviceName: "postgres"
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
      - name: postgres
        image: postgres:12
        envFrom:
          - configMapRef:
              name: postgres-config-demo
        ports:
        - containerPort: 5432
          name: postgredb
        volumeMounts:
        - name: postgredb
          mountPath: /var/lib/postgresql/data
      volumes:
      - name: postgredb