大使给出 403 尝试连接到 Websocket

Question

Ambassador 在尝试访问集群中的 websocket 端点时抛出 403。以下是重现问题的步骤：

[Kube 环境：Docker 桌面 Mac]

安装 Ambassador 和 Echo 服务

1. 使用 Helm 部署 Ambassador

helm repo add datawire https://getambassador.io
helm install ambassador datawire/ambassador

2. 部署 websocket echo deployment/service/mapping

---
apiVersion: v1
kind: Service
metadata:
  name: websocket-echo
  namespace: default
spec:
  ports:
    - name: http
      port: 80
      targetPort: 8080
  selector:
    app: websocket-echo
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: websocket-echo
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      app: websocket-echo
  template:
    metadata:
      labels:
        app: websocket-echo
    spec:
      containers:
        - name: backend
          image: jmalloc/echo-server
          ports:
            - name: http
              containerPort: 8080
---
apiVersion: getambassador.io/v2
kind: Mapping
metadata:
  name: websocket-echo
  namespace: default
spec:
  prefix: /websocket/
  service: websocket-echo
  allow_upgrade:
  - websocket

✅ 验证可以从集群中的 pod 访问 echo 服务器

1. 在集群上创建一个节点shell

kubectl run my-shell --rm -i --tty --image node:12 -- bash

2. 在shell，下载wscat

npm i -g wscat

3. 在shell中，通过集群服务端点连接到服务

wscat -c websocket-echo.default.svc.cluster.local

4. 确认连接已建立并且消息可以回显

❌ 验证无法从集群外部访问回显服务器

1. 在您的本地计算机上安装 wscat

npm i -g wscat

2. 使用 wscat，使用映射连接到服务

wscat -c localhost/websocket-echo/

3. 验证返回的错误是error: Unexpected server response: 403

我是不是漏掉了一些简单的东西？

Answer 1

Ambassador 会将传入请求从 http 重定向到 https。

您可以通过

验证

$ curl localhost/websocket/ -v
*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 80 (#0)
> GET /websocket/ HTTP/1.1
> Host: localhost
> User-Agent: curl/7.54.0
> Accept: */*
> 
< HTTP/1.1 301 Moved Permanently
< location: https://localhost/websocket/
< date: Fri, 07 Aug 2020 08:25:38 GMT
< server: envoy
< content-length: 0
< 
* Connection #0 to host localhost left intact

因此，您需要添加此配置以在 localhost

上禁用重定向

apiVersion: getambassador.io/v2
kind: Host
metadata:
  name: localhost
  namespace: default
spec:
  hostname: localhost
  acmeProvider:
    authority: none
  requestPolicy:
    insecure:
      action: Route

参考

• https://www.getambassador.io/docs/latest/topics/running/tls/cleartext-redirection/#cleartext-routing