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nginx - 无法通过非根上下文路径中的 kubernetes ingress-nginx 使 websocket 应用程序工作

问题描述

这是一个示例 WebSocket 应用程序，我试图让它从 Kubernetes ingress-nginx 控制器工作。

Kubernetes yaml：

echo "
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: ws-example
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: wseg
    spec:
      containers:
      - name: websocketexample
        image: nicksardo/websocketexample
        imagePullPolicy: Always
        ports:
        - name: http
          containerPort: 8080
        env:
        - name: podname
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
---
apiVersion: v1
kind: Service
metadata:
  name: ws-example-svc
  labels:
    app: wseg
spec:
  type: NodePort
  ports:
  - port: 80
    targetPort: 8080
    protocol: TCP
  selector:
    app: wseg
---

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ws-example-svc
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: myhostname.com
    http:
      paths:
      - backend:
          serviceName: ws-example-svc
          servicePort: 80
        path: /somecontext

" | kubectl create -f -

我收到此错误：

WebSocket connection to 'ws://myhostname.com/somecontext/ws?encoding=text' failed: Error during WebSocket handshake: Unexpected response code: 400

当我尝试使用这样的 WebSocket 客户端网页连接时http://www.websocket.org/echo.html

ingress-nginx 的版本是 0.14.0。此版本支持 WebSockets。

更新，当我从本地主机端口转发到 pod 的端口时，我可以直接访问运行 pod 的 websocket。

[rpalaniappan@sdgl15280a331:~/git/zalenium] $ kubectl get pods -l app=wseg
NAME                          READY     STATUS    RESTARTS   AGE
ws-example-5dddb98cfb-vmdt5   1/1       Running   0          5h
[rpalaniappan@sdgl15280a331:~/git/zalenium] $ kubectl port-forward ws-example-5dddb98cfb-vmdt5 8080:8080
Forwarding from 127.0.0.1:8080 -> 8080
Forwarding from [::1]:8080 -> 8080
Handling connection for 8080

[rpalaniappan@sdgl15280a331:~/git/zalenium] $ wscat -c ws://localhost:8080/ws
connected (press CTRL+C to quit)
< Connected to ws-example-5dddb98cfb-vmdt5
> hi
< hi
< ws-example-5dddb98cfb-vmdt5 reports time: 2018-12-28 01:19:00.788098266 +0000 UTC

标签： nginxwebsocketkuberneteskubernetes-ingressnginx-ingress

解决方案

所以基本上是这样的：

nginx.ingress.kubernetes.io/rewrite-target: /

正在从每次您的浏览器尝试发出 WebSocket 连接请求时发送到后端/ws的请求（与 结合）中剥离。path: /ws后端预计/ws何时收到连接请求。

如果您指定path: /mypath并且/mypath/*它有效（对我有效）：

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ws-example-svc
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: myhostname.com
    http:
      paths:
      - backend:
          serviceName: ws-example-svc
          servicePort: 80
        path: /mypath
      - backend:
          serviceName: ws-example-svc
          servicePort: 80
        path: /mypath/*

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