spring-boot - Zipkin 无法在 Docker 中工作 - 连接被拒绝

Question

Zipkin 在本地运行良好，但在 docker 容器中运行不佳。所有的微服务都在Eureka中注册良好，并且可以很好地通信。但唯一的问题是Zipkin。我收到以下错误:

org.springframework.web.client.ResourceAccessException: I/O error onPOST request for "http://localhost:9411/api/v2/spans": Connect tohttp://localhost:9411 [localhost/127.0.0.1] failed: Connection refused

我的 docker-compose.yaml 如下:

version: '3.8'

services:
  currency-exchange:
    image: samankt/springboot-udemy-currency-exchange:0.0.1-SNAPSHOT
    mem_limit: 512m
    ports:
      - '8000:8000'
    networks:
      - saman-network  
    environment:
      EUREKA.CLIENT.SERVICE-URL.DEFAULTZONE: http://naming-server:8761/eureka
      EUREKA.INSTANCE.PREFERIPADDRESS: true  
      SPRING.ZIPKIN.BASE-URL: http://zipkin-server:9411/
      RABBIT_URI: amqp://guest:guest@rabbitmq:5672
      SPRING_RABBITMQ_HOST: rabbitmq
      SPRING_ZIPKIN_SENDER_TYPE: rabbit
    depends_on:
      - naming-server
      - rabbitmq
      
  api-gateway:
    image: samankt/springboot-udemy-currency-api-gateway:0.0.1-snapshot
    mem_limit: 512m
    ports:
      - '8765:8765'
    networks:
      - saman-network  
    environment:
      EUREKA.CLIENT.SERVICE-URL.DEFAULTZONE: http://naming-server:8761/eureka
      EUREKA.INSTANCE.PREFERIPADDRESS: true  
      SPRING.ZIPKIN.BASE-URL: http://zipkin-server:9411/
      RABBIT_URI: amqp://guest:guest@rabbitmq:5672
      SPRING_RABBITMQ_HOST: rabbitmq
      SPRING_ZIPKIN_SENDER_TYPE: rabbit 
    depends_on:
      - naming-server
      - rabbitmq
      
  currency-converter:
    image: samankt/currency-conversion:0.0.1-SNAPSHOT
    mem_limit: 700m
    ports:
      - '8100:8100'
    networks:
      - saman-network  
    environment:
      EUREKA.CLIENT.SERVICE-URL.DEFAULTZONE: http://naming-server:8761/eureka
      EUREKA.INSTANCE.PREFERIPADDRESS: true  
      SPRING.ZIPKIN.BASE-URL: http://zipkin-server:9411/
      SPRING.ZIPKIN.DISCOVERYCLIENTENABLED: true 
      RABBIT_URI: amqp://guest:guest@rabbitmq:5672
      SPRING_RABBITMQ_HOST: rabbitmq
      SPRING_ZIPKIN_SENDER_TYPE: rabbit     
    depends_on:
      - naming-server
      - rabbitmq
      
  naming-server:
    image: samankt/naming-server:0.0.1-SNAPSHOT
    mem_limit: 512m
    ports:
      - '8761:8761'
    environment:
      SPRING.ZIPKIN.BASE-URL: http://zipkin-server:9411/    
    networks:
      - saman-network
      
  zipkin-server:
    image: openzipkin/zipkin:latest
    mem_limit: 400m
    ports:
      - '9411:9411'
    networks:
      - saman-network   
    environment:
      RABBIT_URI: amqp://guest:guest@rabbitmq:5672
    depends_on:
      - rabbitmq
    restart: always
      
      
  rabbitmq:
    image: rabbitmq:3.8.12-management
    ports:
      - '5672:5672'
      - '15672:15672'
    networks:
      - saman-network
    
networks: 
  saman-network:

Answer 1

解决方案 1

该错误告诉您 http://localhost:9411/api/v2/spans 上的连接被拒绝。当您在 docker 容器内运行应用程序时，您需要不使用 localhost 发送请求，而是通过 docker 网络(在您的情况下为 saman-network)发送请求。要访问运行 zipkin 的 docker 容器，您需要将请求发送到 http://zipkin-server:9411/api/v2/spans。

从 Spring Boot 3 开始，Sleuth 已被弃用，您将需要使用 micrometer 。要使用 zipkin 进行跟踪，您可以将以下 4 个依赖项添加到您的 pom.xml 文件

<dependency>
     <groupId>io.micrometer</groupId>
     <artifactId>micrometer-tracing-bridge-brave</artifactId>
</dependency>
<dependency>
    <groupId>io.micrometer</groupId>
    <artifactId>micrometer-observation-test</artifactId>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>io.zipkin.reporter2</groupId>
    <artifactId>zipkin-reporter-brave</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

最后，要更改 Zipkin 端点以发送跟踪信息，您需要将以下内容添加到 application.yaml 文件中。

management:
  tracing:
    sampling:
      probability: 1.0 # only for testing purpose, switch back to 0.1 for production code
  zipkin:
    tracing:
      endpoint: http://localhost:9411/api/v2/spans

使用 Spring 配置文件是一个很好的做法，因此您可以复制application.yaml 文件并将其命名为 application-docker.yaml。在此新文件中，您可以使用 zipkin 容器名称 zipkin-server 修改 Zipkin 端点。

management:
  tracing:
    sampling:
      probability: 1.0 # only for testing purpose, switch back to 0.1 for production code
  zipkin:
    tracing:
      endpoint: http://zipkin-server:9411/api/v2/spans

您可以在环境中传递 SPRING_PROFILES_ACTIVATE=docker 来激活 Spring 配置文件。

---

解决方案 2

对于您来说，这个解决方案实现起来更快，但我没有测试它。您将 Zipkin URL 作为 docker-compose.yml 内的环境值 SPRING.ZIPKIN.BASE-URL 传递。此属性与 Sleuth 包一起使用。使用 Spring Boot 3 和 micrometer 尝试传递: MANAGEMENT.ZIPKIN.TRACING.ENDPOINT: http://zipkin-server:9411/api/v2/spans