无法访问在AWS上运行的Kubernetes群集上通过nginx入口控制器公开的Spring Boot微服务

Question

我在AWS上使用kube-up.sh脚本创建了一个3节点Kubernetes集群（版本:1.5.8)，遵循以下演练：

https://ryaneschinger.com/blog/building-a-kubernetes-cluster-on-aws/

我能够成功地访问集群并查看UI。Kubectl cluster-info命令的输出：

@RestController
public class AddCustomerController {

    private static final String template = "Customer %s is added.";

    @RequestMapping("/addcustomer")
    public Message addcustomer(@RequestParam(value="name") String name) {

        //Retrieve the hostname of the "node"/"container"
        String hostname = null;
        try {
            hostname = InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }

        return new Message(ThreadLocalRandom.current().nextLong(),
                            String.format(template, name),
                            hostname);
    }
}

FROM openjdk:8-jdk-alpine
VOLUME /tmp
ADD build/libs/*.jar app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: add-customer-deployment
spec:
  replicas: 3
  template:
    metadata:
      name: add-customer-microservice
      labels:
        app: add-customer
    spec:
      containers:
      - image: {{ .Values.dockerHubUsername }}/add-customer-microservice:latest
        name: add-customer-microservice
        imagePullPolicy: Always
        ports:
        - containerPort: 8080

服务描述符：

apiVersion: v1
kind: Service
metadata:
  name: add-customer-service
spec:
  selector:
    app: add-customer
  ports:
    - port: 1000
      protocol: TCP
      targetPort: 8080
      name: access-port
  type: NodePort

我已经为其他3个类似的Spring Boot微服务遵循了相同的过程。

入口描述符：

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: quantiphi-poc-ingress-dns
  annotations:
    kubernetes.io/ingress.class: nginx
spec:
  rules:
    - host: crud.qdatalabs.com
      http:
        paths:
        - path: /service1
          backend:
            serviceName: add-customer-service
            servicePort: 1000
        - path: /service1/*
          backend:
            serviceName: add-customer-service
            servicePort: 1000
        - path: /service2
          backend: 
            serviceName: get-customer-service
            servicePort: 2000
        - path: /service2/*
          backend:
            serviceName: get-customer-service
            servicePort: 2000
        - path: /service3
          backend: 
            serviceName: update-customer-service
            servicePort: 3000
        - path: /service3/*
          backend:
            serviceName: update-customer-service
            servicePort: 3000
        - path: /service4
          backend: 
            serviceName: delete-customer-service
            servicePort: 4000
        - path: /service4/*
          backend:
            serviceName: delete-customer-service
            servicePort: 4000

helm install --name my-release stable/nginx-ingress

helm install folder-conataining-helm-chart/

我想我犯了一些配置错误，但我不能把我的手指放在上面。请帮我指路。我很乐意提供更多细节。谢谢你。

Answer 1

正如我在为RStudio设置一个使用HTTP负载平衡入口的Kuberentes集群时所说的那样，最有可能出现的问题是，当您使用这个入口时，您附加的URI与直接访问C(/service1/vs/)不同，因此您的应用程序丢失了，并且没有该URI的内容。

通过Nginx入口控制器，您可以使用Ingress.kubernetes.io/rewrite-target：/annotation来缓解这种情况，并确保即使入口路径中有子文件夹，也可以访问/。

因此，您要么需要使用适当的重写注释，要么支持在服务内部的入口中使用的路径。