apiVersion: v1
kind: Service
metadata:
  name: mysql-external-service
  namespace: mysql
spec:
  type: LoadBalancer
  selector:
    app: mysql
    role: master
  ports:
    - protocol: TCP
      port: 3306
      targetPort: 3306
  # 可选：如果你的云平台支持，可指定 loadBalancerIP
  # loadBalancerIP: "203.0.113.10"