apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgres
  labels:
    app.kubernetes.io/name: postgres
spec:
  serviceName: postgres
  selector:
    matchLabels:
      app.kubernetes.io/name: postgres
  replicas: 1
  template:
    metadata:
      labels:
        app.kubernetes.io/name: postgres
    spec:
      containers:
        - name: postgres
          image: postgres
          env:
            - name: POSTGRES_DB
              valueFrom:
                secretKeyRef:
                  name: postgres-credentials-secret
                  key: database
            - name: POSTGRES_USER
              valueFrom:
                secretKeyRef:
                  name: postgres-credentials-secret
                  key: username
            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: postgres-credentials-secret
                  key: password
            - name: PGDATA
              value: /data/pgdata
          ports:
            - name: postgres
              containerPort: 5432
          resources:
            requests:
              cpu: 500m
              memory: 2Gi
            limits:
              cpu: 1000m
              memory: 3Gi
          volumeMounts:
            - name: postgres-pvc
              mountPath: /data
  volumeClaimTemplates:
    - metadata:
        name: postgres-pvc
      spec:
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 3Gi
---
apiVersion: v1
kind: Service
metadata:
  name: postgres
  labels:
    app.kubernetes.io/name: postgres
spec:
  selector:
    app.kubernetes.io/name: postgres
  ports:
    - name: postgres
      port: 5432
      targetPort: postgres