apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgres
  labels:
    app: postgres
spec:
  serviceName: postgres
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
        - name: postgres
          image: postgres:13.16
          imagePullPolicy: IfNotPresent
          ports:
            - name: postgres
              containerPort: 5432
          envFrom:
            - configMapRef:
                name: postgres-config
          volumeMounts:
            - name: postgres-data
              mountPath: /var/lib/postgresql/data
          readinessProbe:
            exec:
              command:
                - sh
                - -c
                - pg_isready -U "$POSTGRES_USER" -d "$POSTGRES_DB"
            initialDelaySeconds: 8
            periodSeconds: 5
            timeoutSeconds: 3
            failureThreshold: 12
          livenessProbe:
            exec:
              command:
                - sh
                - -c
                - pg_isready -U "$POSTGRES_USER" -d "$POSTGRES_DB"
            initialDelaySeconds: 30
            periodSeconds: 20
            timeoutSeconds: 3
            failureThreshold: 3
          resources:
            requests:
              cpu: 100m
              memory: 256Mi
            limits:
              cpu: 500m
              memory: 512Mi
      volumes:
        - name: postgres-data
          persistentVolumeClaim:
            claimName: postgres-data