endpoint指向目标服务的ip和端口，service配置将其映射为集群内部的服务

apiVersion: v1
kind: Service
metadata:
  name: demo
  namespace: 4dtc
spec:
  ports:
  - name: tcp-demo(注意：tcp服务，必须要有tcp标识)
    port: 80
    protocol: TCP
    targetPort: 31675
  type: ClusterIP

---
apiVersion: v1
kind: Endpoints
metadata:
  name: demo
  namespace: 4dtc
subsets:
- addresses:
  - ip: 10.2.0.101(服务IP)
  ports:
  - name: tcp-demo
    port: 31675
    protocol: TCP