Kubernetes中的UnknownHostException [英] UnknownHostException in kubernetes

问题描述

我在kubernete和docker中使用微服务，当Zuul(网关)将请求数据转发到服务时，我得到了 UnknownHostException 我无法按Pod名称ping服务容器(但是当我使用docker swarm而不是Kubernetes时，我通常可以按主机名ping)

这是我的服务Yaml文件

  apiVersion:apps/v1beta1种类:部署元数据:名称:商人服务标签:运行:商人服务规格:模板:元数据:标签:名称:商人服务规格:容器:-名称:merchantservice图片:merchantservice:最新端口:-containerPort:8001环境:-名称:EUREKA_SERVER值:"eureka1"-名称:EUREKA_SERVER2值:"eureka2"-名称:CONFIG_SERVER值:"configserver"---apiVersion:v1种类:服务元数据:名称:商人服务规格:选择器:名称:商人服务端口:-端口:8001targetPort:8001类型:LoadBalancer 

这是错误输出

  2019-05-28 04:29:53.443警告1 --- [nio-8444-exec-6] o.s.c.n.z.filters.post.SendErrorFilter:过滤期间出错com.netflix.zuul.exception.ZuulException:转发错误...引起原因:com.netflix.client.ClientException:空...造成原因:java.lang.RuntimeException:java.net.UnknownHostException:merchantservice-79cc77d9cc-224mf:再试一次在rx.exceptions.Exceptions.propagate(Exceptions.java:57)〜[rxjava-1.3.8.jar！/:1.3.8]在rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:463)〜[rxjava-1.3.8.jar！/:1.3.8]在rx.observables.BlockingObservable.single(BlockingObservable.java:340)〜[rxjava-1.3.8.jar！/:1.3.8]在com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112)〜[ribbon-loadbalancer-2.3.0.jar！/:2.3.0]...省略了158个通用框架引起原因:java.net.UnknownHostException:商人服务-79cc77d9cc-224mf:再试一次... 

解决方案

确保已在必须通过zuul路由的微服务的application.properties文件中添加了eureka.instance.preferIpAddress = true.>

参考: https://cloud.spring.io/spring-cloud-netflix/multi/multi_spring-cloud-eureka-server.html#spring-cloud-eureka-server-prefer-ip-address

Im using microservice in kubernete and docker and I got an UnknownHostException when Zuul (gateway) forward request data to service I can't ping to service container by pod name (but when i use docker swarm instead of Kubernetes, i can ping by host name normally)

This is my service yaml file

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: merchantservice
  labels:
    run: merchantservice
spec:
  template:
    metadata:
      labels:
        name: merchantservice
    spec:
      containers:
      - name: merchantservice
        image: merchantservice:latest
        ports:
        - containerPort: 8001
        env:
          - name: EUREKA_SERVER
            value: "eureka1"
          - name: EUREKA_SERVER2
            value: "eureka2"
          - name: CONFIG_SERVER
            value: "configserver"
---
apiVersion: v1
kind: Service
metadata:
  name: merchantservice
spec:
  selector:
    name: merchantservice
  ports:
    - port: 8001
      targetPort: 8001
  type: LoadBalancer

And this is error output

2019-05-28 04:29:53.443  WARN 1 --- [nio-8444-exec-6] o.s.c.n.z.filters.post.SendErrorFilter   : Error during filtering

com.netflix.zuul.exception.ZuulException: Forwarding error
...
Caused by: com.netflix.client.ClientException: null
...
Caused by: java.lang.RuntimeException: java.net.UnknownHostException: merchantservice-79cc77d9cc-224mf: Try again
    at rx.exceptions.Exceptions.propagate(Exceptions.java:57) ~[rxjava-1.3.8.jar!/:1.3.8]
    at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:463) ~[rxjava-1.3.8.jar!/:1.3.8]
    at rx.observables.BlockingObservable.single(BlockingObservable.java:340) ~[rxjava-1.3.8.jar!/:1.3.8]
    at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112) ~[ribbon-loadbalancer-2.3.0.jar!/:2.3.0]
    ... 158 common frames omitted
Caused by: java.net.UnknownHostException: merchantservice-79cc77d9cc-224mf: Try again
...

解决方案

Make sure that you have added eureka.instance.preferIpAddress = true in your application.properties file of the microservice which has to be routed via zuul.

Reference: https://cloud.spring.io/spring-cloud-netflix/multi/multi_spring-cloud-eureka-server.html#spring-cloud-eureka-server-prefer-ip-address

这篇关于Kubernetes中的UnknownHostException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！