Практикум PostgreSQL — StatefulSet — минимальный паттерн

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgres
spec:
  serviceName: postgres
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
        - name: postgres
          image: postgres:16-alpine
          ports:
            - containerPort: 5432
          envFrom:
            - secretRef:
                name: postgres-credentials
          volumeMounts:
            - name: pgdata
              mountPath: /var/lib/postgresql/data
          readinessProbe:
            exec:
              command: ["pg_isready", "-U", "app"]
            initialDelaySeconds: 10
            periodSeconds: 5
  volumeClaimTemplates:
    - metadata:
        name: pgdata
      spec:
        accessModes: ["ReadWriteOnce"]
        storageClassName: fast-ssd
        resources:
          requests:
            storage: 100Gi