Docker中无法运行注册到Eureka的UserService

相关配置 #

UserDockerFile代码 #

FROM openjdk
COPY ./target/user_service-0.0.1-SNAPSHOT.jar .
ENV EUREKA_INSTANCE_HOSTNAME=host.docker.internal
CMD ["java","-jar","user_service-0.0.1-SNAPSHOT.jar"]

用户服务application.yaml配置 #

server:
  port: 9001

spring:
  application:
    name: user-service

eureka:
  instance:
    hostname: localhost

Eureka Server的application.yaml配置 #

server:
  port: 8761


eureka:
  client:
    registerWithEureka: false
    fetchRegistry: false
  server:
    waitTimeInMsWhenSyncEmpty: 0
  instance:
    prefer-ip-address : true

执行的镜像构建及运行命令 #

docker run -it -p 9001:9001  user-service

错误信息 #

Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://localhost:8761/eureka/},
exception=I/O error on GET request for "http://localhost:8761/eureka/apps/": Connect to
localhost:8761 [localhost/127.0.0.1] failed: Connection refused; nested exception is
org.apache.http.conn.HttpHostConnectException: Connect to localhost:8761 [localhost/127.0.0.1]
failed: Connection refused stacktrace=org.springframework.web.client.ResourceAccessException:
I/O error on GET request for "http://localhost:8761/eureka/apps/": Connect to localhost:8761
[localhost/127.0.0.1] failed: Connection refused; nested exception is
org.apache.http.conn.HttpHostConnectException: Connect to localhost:8761 [localhost/127.0.0.1]
failed: Connection refused
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:785)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:711)

解决方案 #

核心问题是Docker容器内的localhost指向容器自身，而Eureka Server运行在宿主机上，导致容器无法连通Eureka服务。

1. 修改用户服务application.yaml配置：
   补充Eureka服务地址配置，将其指向宿主机：

   server:
     port: 9001
   
   spring:
     application:
       name: user-service
   
   eureka:
     instance:
       hostname: host.docker.internal  # 匹配Dockerfile中的环境变量，适配Windows/macOS环境
     client:
       serviceUrl:
         defaultZone: http://host.docker.internal:8761/eureka/  # 指定宿主机上的Eureka地址
   

2. Linux环境适配方案：
   如果是Linux系统，host.docker.internal可能无法直接生效，可选择两种方式：

   • 让容器共享宿主机网络，运行命令改为：

     docker run -it --network=host user-service
     

   • 替换配置中的host.docker.internal为宿主机的实际IP地址：

     eureka:
       client:
         serviceUrl:
           defaultZone: http://宿主机实际IP:8761/eureka/
     

内容的提问来源于stack exchange，提问作者amanbisht39