Question

当我通过Intellij启动zuul和eureka时，一切都很好，zuul已在eureka服务器上注册。在eureka服务器中，我看到

2019-03-15 18:00:20.727  INFO 31713 --- [nio-8761-exec-2] c.n.e.registry.AbstractInstanceRegistry  : Registered instance ZUUL-SERVER/192.168.0.11:zuul-server:8762 with status UP (replication=false)
2019-03-15 18:00:21.309  INFO 31713 --- [nio-8761-exec-3] c.n.e.registry.AbstractInstanceRegistry  : Registered instance ZUUL-SERVER/192.168.0.11:zuul-server:8762 with status UP (replication=true)

但是当我尝试在zuul容器中使用docker-compose up -d与docker启动这两项服务时，我却遇到了例外：

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
    at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112) ~[eureka-client-1.9.3.jar!/:1.9.3]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.9.3.jar!/:1.9.3]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) ~[eureka-client-1.9.3.jar!/:1.9.3]
    at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.3.jar!/:1.9.3]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.9.3.jar!/:1.9.3]
    at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1051) ~[eureka-client-1.9.3.jar!/:1.9.3]
    at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:965) ~[eureka-client-1.9.3.jar!/:1.9.3]
    at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:414) ~[eureka-client-1.9.3.jar!/:1.9.3]
    at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:269) ~[eureka-client-1.9.3.jar!/:1.9.3]
    at org.springframework.cloud.netflix.eureka.CloudEurekaClient.<init>(CloudEurekaClient.java:63) ~[spring-cloud-netflix-eureka-client-2.1.0.M1.jar!/:2.1.0.M1]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.eurekaClient(EurekaClientAutoConfiguration.java:290) ~[spring-cloud-netflix-eureka-client-2.1.0.M1.jar!/:2.1.0.M1]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$8fcb0d88.CGLIB$eurekaClient$2(<generated>) ~[spring-cloud-netflix-eureka-client-2.1.0.M1.jar!/:2.1.0.M1]

eureka和zuul的spring-boot-starter-parent的版本为2.1.2.RELEASE，spring-cloud的版本为Greenwich.M1

eureka服务器属性文件：

# Give a name to the eureka server
spring.application.name=eureka-server

# default port for eureka server
server.port=8761

# eureka by default will register itself as a client. So, we need to set it to false.
# What's a client server? See other microservices (image, gallery, auth, etc).
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

zuul-properties文件包含以下行：

eureka.client.service-url.default-zone=http://eureka:8761/eureka/

docker-compose.yml文件（相关服务）

version: "2"

services:
  eureka:
    container_name: eureka
    build:
      context: .
      dockerfile: eureka.Dockerfile
    image: eureka-service
    ports: 
      - "8761:8761"
    networks:
      - event-network

  zuul:
    container_name: zuul
    build:
      context: .
      dockerfile: zuul.Dockerfile
    image: zuul-service
    ports: 
      - "8762:8762"
    networks:
      - event-network

networks:
  event-network:
    driver: bridge

在两个Dockerfile中，我都只是将jar添加到容器中，并使用java -jar命令启动jar。我用@EnableEurekaClient注释了zuul主类，并用@EnableEurekaServer注释了eureka主类。我不认为异常与zuul有关，因为我的其余微服务都存在相同的问题。它们的其余部分也无法连接到尤里卡。

当我通过容器或通过intellij启动尤里卡时，我可以访问尤里卡仪表板。我什至尝试放置this图像而不是我的图像，但是我遇到了同样的异常。我还尝试了docker exec "zuul" -it bash，并在zuul容器中尝试了curl eureka:8761，并且可以正常访问仪表板。

Answer 1

不确定Eureka，但nginx代理服务器也有类似问题。 Nginx无法识别docker的主机解析器，我使用的一种可能的解决方案是获取特定容器服务的静态IP。

在这种情况下，可以为Eureka容器设置静态IP，并在Zuul的配置文件中使用它。

如果您有一个Eureca容器，当然可以使用。对于很多容器，应该看看zuul如何阅读和理解docker的主机解析器。

Eureka客户端无法使用Docker连接到服务器

1 个答案: