ZuulException: Forwarding error : Load balancer does not have available server for client:

柔光的暖阳◎ 2022-05-21 08:13 610阅读 0赞

在配置zuul的时候，用postman调接口的时候报错误：

  1. com.netflix.zuul.exception.ZuulException: Forwarding error
  2.     at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.handleException(RibbonRoutingFilter.java:188)
  3.     at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:163)
  4.     at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.run(RibbonRoutingFilter.java:111)
  5.     at com.netflix.zuul.ZuulFilter.runFilter(ZuulFilter.java:112)
  6.     at com.netflix.zuul.FilterProcessor.processZuulFilter(FilterProcessor.java:193)
  7.     at com.netflix.zuul.FilterProcessor.runFilters(FilterProcessor.java:157)
  8.     at com.netflix.zuul.FilterProcessor.route(FilterProcessor.java:118)
  9.     at com.netflix.zuul.ZuulRunner.route(ZuulRunner.java:96)
  10.     at com.netflix.zuul.http.ZuulServlet.route(ZuulServlet.java:116)
  11.     at com.netflix.zuul.http.ZuulServlet.service(ZuulServlet.java:81)
  12.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
  13.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  14.     at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
  15.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
  16.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  17.     at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
  18.     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  19.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
  20.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  21.     at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:96)
  22.     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  23.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
  24.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  25.     at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:111)
  26.     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  27.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
  28.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  29.     at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
  30.     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  31.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
  32.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  33.     at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
  34.     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  35.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
  36.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  37.     at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
  38.     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  39.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
  40.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  41.     at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)
  42.     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  43.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
  44.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  45.     at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
  46.     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  47.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
  48.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  49.     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
  50.     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
  51.     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
  52.     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
  53.     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
  54.     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
  55.     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
  56.     at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
  57.     at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
  58.     at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
  59.     at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
  60.     at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
  61.     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
  62.     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  63.     at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
  64.     at java.lang.Thread.run(Thread.java:745)
  65. Caused by: com.netflix.client.ClientException: Load balancer does not have available server for client: user-service-2
  66.     at com.netflix.loadbalancer.LoadBalancerContext.getServerFromLoadBalancer(LoadBalancerContext.java:483)
  67.     at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:184)
  68.     at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180)
  69.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  70.     at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94)
  71.     at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42)
  72.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  73.     at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.java:127)
  74.     at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73)
  75.     at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.java:52)
  76.     at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79)
  77.     at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:45)
  78.     at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:276)
  79.     at rx.Subscriber.setProducer(Subscriber.java:209)
  80.     at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:138)
  81.     at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:129)
  82.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  83.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  84.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  85.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  86.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  87.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  88.     at rx.Observable.subscribe(Observable.java:10247)
  89.     at rx.Observable.subscribe(Observable.java:10214)
  90.     at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:444)
  91.     at rx.observables.BlockingObservable.single(BlockingObservable.java:341)
  92.     at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112)
  93.     at org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:187)
  94.     at org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:52)
  95.     at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302)
  96.     at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298)
  97.     at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
  98.     at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
  99.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  100.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  101.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  102.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  103.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  104.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  105.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  106.     at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
  107.     at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
  108.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  109.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  110.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  111.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  112.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  113.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  114.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  115.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  116.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  117.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  118.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  119.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  120.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  121.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  122.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  123.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  124.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  125.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  126.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  127.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  128.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  129.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  130.     at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
  131.     at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
  132.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  133.     at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
  134.     at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
  135.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  136.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  137.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  138.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  139.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  140.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  141.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  142.     at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  143.     at rx.Observable.unsafeSubscribe(Observable.java:10151)
  144.     at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
  145.     at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
  146.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  147.     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  148.     at rx.Observable.subscribe(Observable.java:10247)
  149.     at rx.Observable.subscribe(Observable.java:10214)
  150.     at rx.internal.operators.BlockingOperatorToFuture.toFuture(BlockingOperatorToFuture.java:51)
  151.     at rx.observables.BlockingObservable.toFuture(BlockingObservable.java:411)
  152.     at com.netflix.hystrix.HystrixCommand.queue(HystrixCommand.java:378)
  153.     at com.netflix.hystrix.HystrixCommand.execute(HystrixCommand.java:344)
  154.     at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:158)
  155.     ... 61 common frames omitted

在stackoverflow和github上找了很多办法，但是还不能解决我的问题，可能对你有用，一并总结如下：

  1. https://stackoverflow.com/questions/41401009/load-balancer-does-not-have-available-server-for-client
  2. https://github.com/spring-cloud/spring-cloud-netflix/issues/2530

这些都解决不了问题，后来查了zuul的官方配置：https://cloud.spring.io/spring-cloud-netflix/multi/multi\_\_router\_and\_filter\_zuul.html

发现我的zuul中boostrap.properties的配置是：
zuul.routes.user-service-1.path=//\*
zuul.routes.user-service-2.path=//\*
如果把user-service-2这个配置去掉，那么就正常，一旦加上就报错，后来怀疑是/*/是这个地方配置有问题，但是改成：
zuul.routes.user-service-1.path=/user-service-1/
zuul.routes.user-service-2.path=/user-service-2/**
用postman调接口的时候，就要重复用user-service-1, 例如：
get http://localhost:8900/user-service-1/user-service-1/user
这样才调得通，但是很显然这不是想要的，应该是：
get http://localhost:8900/user-service-1/user

于是查看zuul的配置文档，找到:
这里写图片描述

于是配置：
zuul.routes.user-service-1.path=/user-service-1/**
zuul.routes.user-service-1.stripPrefix=false
zuul.routes.user-service-2.path=/user-service-1/**
zuul.routes.user-service-2.stripPrefix=false

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