带有Kubernetes入口的502错误网关

问题描述：

我有一个kubernetes设置，配置如下:

I have a kubernetes setup with the configuration like below:

#---
kind: Service
apiVersion: v1
metadata:
  name: myservice
spec:
  selector:
    app: my-service
  ports:
    - protocol: "TCP"
      # Port accessible inside cluster
      port: 8080
      # Port to forward to inside the pod
      targetPort: 80



---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: my-service
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: my-service
    spec:
      containers:
        - name: my-service
          image: my-custom-docker-regisry/my-service:latest
          imagePullPolicy: Always
          ports:
            - containerPort: 8080
      imagePullSecrets:
      - name: regcred

和我的入口:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: test-ingress
  annotations:
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
spec:
  rules:
  - http:
      paths:
      - path: /myservice
        backend:
          serviceName: myservice
          servicePort: 80

我试图做的是从docker注册表中提取图像并在kubernetes中运行它.我在这里配置了一个部署和一项服务，并通过入口将服务公开给外部.

What I tried to do is pulling the image from my docker registry and run it in the kubernetes. I have configured here one deployment and one service and expose the service to the outside with the ingress.

我的minikube在IP 192.168.99.100下运行，当我尝试访问地址为curl 192.168.99.100:80/myservice的应用程序时，我得到了502 Bad Gateway.

My minikube is running under ip 192.168.99.100 and when I tried to access my application with address: curl 192.168.99.100:80/myservice, I got 502 Bad Gateway.

有人知道它为什么会发生吗，还是我在配置上做错了什么?谢谢你！

Does anyone have an idea why it happended or did I do something wrong with the configuration? Thank you in advanced!

答

您的入口针对此服务:

     serviceName: myservice
     servicePort: 80

，但是名为myservice的服务公开了端口8080而不是80:

but the service named myservice exposes port 8080 rather than 80:

  ports:
    - protocol: "TCP"
      # Port accessible inside cluster
      port: 8080
      # Port to forward to inside the pod
      targetPort: 80

您的入口应指向该服务公开的端口之一.

Your ingress should point to one of the ports exposed by the service.

此外，服务本身以端口80为目标，但是部署中的Pod似乎公开了端口8080，而不是80:

Also, the service itself targets port 80, but the pods in your deployment seem to expose port 8080, rather than 80:

  containers:
    - name: my-service
      image: my-custom-docker-regisry/my-service:latest
      imagePullPolicy: Always
      ports:
        - containerPort: 8080

长话短说，看来您可以在service中将port与targetPort交换，以便:

So long story short, looks like you could swap port with targetPort in your service so that:

pod暴露端口8080
该服务在服务名称myservice端口80下公开所有Pod的端口8080，
入口将nginx配置为将您的流量代理到服务myservice端口80.

the pods expose port 8080
the service exposes port 8080 of all the pods under service name myservice port 80,
the ingress configures nginx to proxy your traffic to service myservice port 80.

带有Kubernetes入口的502错误网关

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