1、多个服务 相互注册
A：
server: port: 10000 spring: application: name: eureka-server eureka: client: service-url: defaultZone: http://127.0.0.1:10001/eureka
B：
server: port: 10001 spring: application: name: eureka-server eureka: client: service-url: defaultZone: http://127.0.0.1:10000/eureka
2、供应方 与消费方 当一台宕机、会使用另外一台
eureka:
client:
service-url:
defaultZone: http://127.0.0.1:10000/eureka,http://127.0.0.1:10001/eureka