com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server

问题

I am very new to the microservices and trying to run the code from link: https://dzone.com/articles/advanced-microservices-security-with-spring-and-oa . When I simply run the code I see the following error comes.

What is the issue ?

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
    at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:111) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1030) [eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:944) [eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.DiscoveryClient.refreshRegistry(DiscoveryClient.java:1468) [eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.DiscoveryClient$CacheRefreshThread.run(DiscoveryClient.java:1435) [eureka-client-1.4.12.jar:1.4.12]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [na:1.8.0_144]
    at java.util.concurrent.FutureTask.run(Unknown Source) [na:1.8.0_144]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_144]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_144]
    at java.lang.Thread.run(Unknown Source) [na:1.8.0_144]

2017-09-09 18:53:11.909 ERROR 16268 --- [tbeatExecutor-0] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution error

I have not installed anything special on to the system. Please let me know what do I need to install?

回答1:

I find I have to add these two applications to the appllication.properties,it can work.Only one is not enough.

eureka.client.register-with-eureka=false

eureka.client.fetch-registry=false

回答2:

This particular message is just a warning. Your application is attempting to register with Eureka but Eureka is not responding. You can either start an instance of Eureka or disable the automatic registration by adding the following to your application.yml.

eureka:
  client:
    register-with-eureka: false

回答3:

You need to create Eureka Registry Server which is another microservice. It's main class incase of an SpringBoot application, should have @EnableEurekaServer annotation.

Then in your Eureka Client you will have to mention the Registry server URL in appliation.yml as below :

spring:
  application:
    name: stock-service

server:
  port: 8083


eureka:
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://localhost:8084/eureka/
  instance:
    hostname: localhost

where defaultzone should hold the value of your Eureka Registry.

Once you do all these configurations you need to Get the Eureka Registry microservice up and then you can get the Eureka client up. Once your Registry is up you will not face this exception.

回答4:

This is happening because it is trying to connect to any known server, so to stop that error, a known server is eureka server on port 8761 which is its default port, you will have to update the application.properties with following

server.port=8761

To avoid eureka from registering itself, you add this to the application.properties

eureka.client.register-with-eureka=false

Ensure that EurekaServer is enabled, for example using spring boot you write the below on the main class.

@EnableEurekaServer

Please pardon me providing solution using .properties file but that is what i work with but .yml configurations shouldn't be too different.

回答5:

Make sure your ribbon client is correct

package com.in28minutes.microservices.currencyconversionservice;

import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

@FeignClient(name="curreenter code herency-exchange-service")
@RibbonClient(name="currency-exchange-service") 
public interface CurrencyExchangeServiceProxy { 
    @GetMapping("/currency-exchange/from/{from}/to/{to}")
    public CurrencyConversionBean retrieveExchangeValue
        (@PathVariable("from") String from, @PathVariable("to") String to); //mention correct pathvariables
}

回答6:

Look for the filterType() in ZuulLoggingFiler.java. I had the same problem. Then i saw my filter was returning null. so I changed it to "post" and it worked.

@Override
public String filterType() {
    // TODO Auto-generated method stub
    return "post";
}

来源：https://stackoverflow.com/questions/46131196/com-netflix-discovery-shared-transport-transportexception-cannot-execute-reques

标签

java

spring-boot

microservices