启动某个应用服务，能正常启动，也能正常访问使用，但是每次都有连接失败的消息提示，抽出时间研究了下发现了原因。

是因为连接eureka失败导致的错误信息：

系统会在“Getting all instance registry info from the eureka server” 步骤后提示：

java.net.ConnectException: Connection refused: connect

这是注册与发现中心Eureka的prod模式配置：

spring:
  application:
    name: spring-cloud-demo-eureka
  zipkin:
    base-url: http://192.168.73.136:9411
  boot:
    admin:
      client:
        url: http://192.168.73.136:8084

server:
  port: 8761

management:
  endpoint:
    health:
      show-details: always
  endpoints:
    web:
      exposure:
        include: health,info

eureka:
  instance:
    hostname: host
  client:
    # 注册到其他的eureka服务器，生产环境集群部署必须
    registerWithEureka: true
    # 是否是从eureka获取注册信息，单一节点不需要，生产环境集群部署必须
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://192.168.73.136:8761/eureka/,http://192.168.73.136:8861/eureka/,http://192.168.73.136:8961/eureka/

因为Eureka是集群部署，所以应用需要在三个eureka上都注册，但是我因为练习内存吃紧，就开了一台，，重新添加内存，全部开启，问题解决。。。

Eureka docker-compose配置：

version: '3.1'
services:
  spring-cloud-demo-eureka1:
    restart: always
    image: 192.168.73.134:5000/spring-cloud-demo-eureka
    container_name: spring-cloud-demo-eureka1
    ports:
      - 8761:8761
    networks:
      - eureka-network1
  spring-cloud-demo-eureka2:
    restart: always
    image: 192.168.73.134:5000/spring-cloud-demo-eureka
    container_name: spring-cloud-demo-eureka2
    ports:
      - 8861:8761
    networks:
      - eureka-network2
  spring-cloud-demo-eureka3:
    restart: always
    image: 192.168.73.134:5000/spring-cloud-demo-eureka
    container_name: spring-cloud-demo-eureka3
    ports:
      - 8961:8761
    networks:
      - eureka-network3

networks:
  eureka-network1:
  eureka-network2:
  eureka-network3: