Question

我们正在尝试在Docker容器（这是Spring Boot应用程序）上部署Netflix Eureka Server。我们将其作为Docker服务与Docker群一起部署，以进行容器编排。当我们直接创建容器并运行应用程序时，一切正常。 Eureka服务器使用正确的IP地址注册所有客户端应用程序。但是，当我们创建它并将其作为docker服务部署时，它会使用错误的IP地址注册应用程序。

我们已经按照spring文档尝试了以下解决方案，并在配置文件中更新了属性值。


spring: 
   cloud:
     inetutils:
       ignoredInterfaces:
          - docker0
          - veth.*

eureka:
  instance:
    preferIpAddress: true

还尝试了以下解决方案：

https://github.com/spring-cloud/spring-cloud-netflix/issues/1820

https://github.com/spring-cloud/spring-cloud-netflix/issues/2084

我们在运行docker服务时，为容器分配了一个IP地址，例如172.16.1.3，而在docker内部启动的服务被分配了新的IP地址172.16.1.4，因为此问题，客户端应用程序使用容器的IP将其自身注册到Eureka服务器。但是可以通过172.16.1.4访问。

那么为什么将docker作为服务运行会分配两个IP地址？

Here Eureka server is running on 10.255.53.172 IP address but as we can see in the second image it shows different IP in Instance Info

Eureka instance is registered with containers IP but it's accessible with its service IP in the network

Answer 1

我们在使用docker swarm模式的生产环境中使用以下配置：

Eureka服务器配置

# Defines the Eureka server that is used by the Netflix OSS components to use as the registry
# for server discovery
eureka:
  instance:
    hostname: ${HOST_NAME:localhost}
    appname: eureka-cluster
    # enable to register multiple app instances with a random server port
    instance-id: ${spring.application.name}:${random.uuid}
    leaseRenewalIntervalInSeconds: 10
    leaseExpirationDurationInSeconds: 20

Eureka客户端配置

eureka:
  client:
    registerWithEureka: ${REGISTER_WITH_EUREKA:true}
    fetchRegistry: ${FETCH_REGISTRY:false}
    serviceUrl:
      defaultZone: ${EUREKA_DEFAULT_ZONE:http://localhost:8761/eureka/}
  instance:
    hostname: ${HOST_NAME:${spring.application.name}}  # work on swarm
    preferIpAddress: ${PREFER_IP_ADDRESS:false}
    # enable to register multiple app instances with a random server port
    instance-id: ${spring.application.name}:${random.uuid}
    leaseRenewalIntervalInSeconds: ${LEASE_RENEWAL_INTERVAl_IN_SECONDS:10}
    leaseExpirationDurationInSeconds: ${LEASE_EXPIRATION_DURATIONIN_SECONDS:20}

集群服务定义

  rd-service:
      image: my-eureka-server-microservice-image
    ports:
    - "8763:8763"
      networks:
      - backend

  client-service:
    image: my-eureka-client-microservice-image
    networks:
    - backend
    networks:
    environment:
    - "EUREKA_DEFAULT_ZONE=http://rd-service:8763/eureka"
    - "REGISTER_WITH_EUREKA=true"
    - "FETCH_REGISTRY=true"

networks:
  backend:
    external: true

重要提示：：服务必须位于eureka服务器docker服务上使用的同一docker overlay网络中。

Docker群集的Netflix Eureka服务器和客户端实例注册问题

1 个答案: