SFTP服务器在部署到Kubernetes(GKE)时不可访问

Question

当使用NodePort服务和Kubernetes入口公开时，SFTP服务器不可访问。但是，如果使用LoadBalancer类型的服务公开相同的部署，它就可以正常工作。

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: sftp
  labels:
    environment: production
    app: sftp
spec:
  replicas: 1
  minReadySeconds: 10
  template:
    metadata:
      labels:
        environment: production
        app: sftp
      annotations:
        container.apparmor.security.beta.kubernetes.io/sftp: runtime/default
    spec:
      containers:
        - name: sftp
          image: atmoz/sftp:alpine
          imagePullPolicy: Always
          args: ["user:pass:1001:100:upload"]
          ports:
            - containerPort: 22
          securityContext:
            capabilities:
              add: ["SYS_ADMIN"]
          resources: {}

apiVersion: v1
kind: Service
metadata:
  labels:
    environment: production
  name: sftp-service
spec:
  type: LoadBalancer
  ports:
  - name: sftp-port
    port: 22
    protocol: TCP
    targetPort: 22
  selector:
    app: sftp

然而，我尝试使用GKE Ingress公开相同的部署，但它不起作用。以下是入口的清单：

# First I create a NodePort service to expose the deployment internally

---
apiVersion: v1
kind: Service
metadata:
  labels:
    environment: production
  name: sftp-service
spec:
  type: NodePort
  ports:
  - name: sftp-port
    port: 22
    protocol: TCP
    targetPort: 22
    nodePort: 30063
  selector:
    app: sftp

# Ingress service has SFTP service as it's default backend
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: basic-ingress-2
spec:
  backend:
    serviceName: sftp-service
    servicePort: 22
  rules:
  - http:
      paths:
      # "http-service-sample" is a service exposing a simple hello-word app deployment
      - path: /sample
        backend:
          serviceName: http-service-sample
          servicePort: 80

将外部IP分配给入口后（我知道完全设置需要几分钟），xxx.xx.xxx/sample开始工作，但sftp-p 80xxx.xx.xx.xxx不工作。

下面是我从服务器得到的错误：

ssh_exchange_identification: Connection closed by remote host
Connection closed

在上面的设置中，我做错了什么？为什么LoadBalancer服务能够允许访问SFTP服务，而Ingress却失败了？

Answer 1

在Kubernetes Ingress中路由HTTP/HTTPS协议以外的任何其他流量（参见文档），目前还不完全支持这一点。

您可以尝试做一些解决方法，如这里所描述的：kubernetes：通过Ingress路由非HTTP请求到Container