How to configure hosts when setting up Eureka

（1）yml file

spring:
  profiles: 7900
server:
  port: 7900
eureka:
  instance:
    hostname: eureka-7900

---
spring:
  profiles: 7901
server:
  port: 7901
eureka:
  instance:
    hostname: eureka-7901

---
spring:
  profiles: 7902
server:
  port: 7902
eureka:
  instance:
    hostname: eureka-7902

（2） Configuration information