只要注册时服务名相同就会形成集群

server:
  port: 8001
eureka:
  client:
    serviceUrl:
      defaultZone: http://127.0.0.1:7001/eureka/,http://127.0.0.1:7002/eureka/,http://127.0.0.1:7003/eureka/
  instance:
    prefer-ip-address: true #跨域访问
spring:
  application:
    name: client-demo #服务名,这里的服务名相同即可