kubernetes中的UnknownHostException

Question

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，我得到了一个UnknownHostException，我不能通过pod名称ping到服务容器（但是当我使用docker swarm而不是Kubernetes时，我可以正常地通过主机名ping）

这是我的服务yaml文件

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

这是错误输出

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
...

Answer 1

确保在必须通过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