容器中Spring应用无法连接Config Server的问题及解决

问题现象 #

• 本地通过Eclipse或终端运行Eureka服务jar包时，可正常连接Config Server并启动
• 容器化部署后，服务启动失败，日志显示无法访问Config Server，报错No route to host
• 已将application.properties替换为bootstrap.properties，问题未解决

错误日志 #

2025-04-07 12:03:56 2025-04-07T18:03:56.388Z  INFO 1 --- [app-seven-eureka] [           main] c.c.c.ConfigServicePropertySourceLocator : Fetching config from server at : http://10.1.10.220:8888
2025-04-07 12:03:59 2025-04-07T18:03:59.853Z  INFO 1 --- [app-seven-eureka] [           main] c.c.c.ConfigServicePropertySourceLocator : Exception on Url - http://10.1.10.220:8888:org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://10.1.10.220:8888/app-seven-eureka/default": No route to host. Will be trying the next url if available
2025-04-07 12:03:59 2025-04-07T18:03:59.853Z  WARN 1 --- [app-seven-eureka] [           main] c.c.c.ConfigServicePropertySourceLocator : Could not locate PropertySource: I/O error on GET request for "http://10.1.10.220:8888/app-seven-eureka/default": No route to host
2025-04-07 12:03:59 2025-04-07T18:03:59.857Z  INFO 1 --- [app-seven-eureka] [           main] .s.AppMSEurekaApplication : No active profile set, falling back to 1 default profile: "default"

当前配置 #

Dockerfile #

FROM openjdk:25-oraclelinux8

WORKDIR /app

COPY target/app-seven-eureka-1.0.0.jar /app/app7.jar

EXPOSE 8787

ENTRYPOINT ["java", "-jar", "/app/app7.jar"]

容器启动命令 #

docker run -p 8787:8787 app-seven-eureka

解决方案：使用Docker Compose创建自定义桥接网络 #

将Config Server和Eureka服务加入同一自定义Docker网络，容器间可通过容器名直接访问，解决路由不通问题。以下是docker-compose.yml配置：

services:
    service-config:
        container_name: app-seven-config
        networks: 
          - app-seven-network
    
    service-eureka:
        container_name: app-seven-eureka
        networks: 
          - app-seven-network
        extra_hosts:
          - "docker.internal:127.0.0.1"
networks:
  app-seven-network:
    driver: bridge

注意：需要将Eureka服务配置中的Config Server地址改为容器名（http://app-seven-config:8888），而非宿主机IP，确保容器内可以通过自定义网络解析到Config Server容器。

内容的提问来源于stack exchange，提问作者Alfredo Morales