使用 spring 引导在 Docker 中运行 Eureka Server 和 Eureka Client

Question

Hope you are doing good, I face a problem and try to solve it for many days but failed. I have two spring boot microservice, one is called the client and the second is called the server. When I dockerize the microservices and run the server, it runs properly but when I try to run the client, it gives me an error. the error is like.

2021-12-27 11:01:45.646  WARN 1 --- [nfoReplicator-0] c.n.discovery.InstanceInfoReplicator     : There was a problem with the instance info replicator


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-1.10.17.jar!/:1.10.17]

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.10.17.jar!/:1.10.17]

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.10.17.jar!/:1.10.17]

at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.10.17.jar!/:1.10.17]

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.10.17.jar!/:1.10.17]

at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:876) ~[eureka-client-1.10.17.jar!/:1.10.17]

at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) ~[eureka-client-1.10.17.jar!/:1.10.17]

at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) ~[eureka-client-1.10.17.jar!/:1.10.17]

at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]

at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]

at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) ~[na:na]

at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135) ~[na:na]

at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[na:na]

at java.base/java.lang.Thread.run(Thread.java:831) ~[na:na]

The Server application.yml file is;

server.port: 8761

eureka:
  instance:
    hostname: eurekaserver
  client:
    registerWithEureka: false
    fetchRegistry: false

spring:
  application:
    name: EUREKA-SERVER

While the client application.yml file is like;

server:
  port: 8080


spring:
  application:
    name: EUREKA-CLIENT

eureka:
  instance:
    hostname: eurekaclient
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka

I try defaultZone: http://eurekaserver:8761/eureka . but got the same error.

The docker file of Client is:

FROM openjdk:17-jdk-alpine
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} eurekaclient.jar
EXPOSE 8080
ENTRYPOINT ["java","-jar","/eurekaclient.jar"]

Thanks in advance:)

Answer 1

Try the following: The label after service-url property (which can be aliased as serviceUrl in YML) is a HashMap KEY, not a property label. So it has to be kept as a Camel Case tag in any ways!

eureka.client.service-url.defaultZone=http://[myIP@]:8787/eureka

Answer 2

you can't register to eureka server by passing localhost.

what you can do, give the container name in place of localhost and create one network, and while running the images specify the network as well.

Please follow the below steps.

Let's say your eureka images name is -> eureka-server

first, create a network using the below command:

docker create network springcloud-ms

run the eureka container and specify the network as well like below:

docker run --name eureka-container -p 8761:8761 --network springcloud-ms eureka-server

change the application.yml of eureka client as below:

server: port: 8080 spring: application: name: EUREKA-CLIENT eureka: instance: hostname: eurekaclient client: serviceUrl: defaultZone: http://eureka-container:8761/eureka

then run the client image. Let's say your client image name is client-service then use the below command:

docker run --name client-container -p 8080:8080 --network springcloud-ms client-service