nginx ingress代理websocket流量的設定方法

2022-03-25 13:02:46

1 概述：

1.1 環境

版本資訊如下：
a、作業系統：centos 7.6
b、kubernetes版本：v1.15.0
c、ingress nginx版本：0.47.0

2 nginx ingress是否支援代理websocket流量

nginx ingress 預設支援websocket協定，因此ingress範例不需要額外設定。
值得注意的是，proxy-read-timeout和proxy-send-timeout的預設值是60秒，應該根據實際情況增加此兩個引數的值。如果使用預設值60，則websocket使用者端超過60秒沒有給websocket伺服器端傳送資訊，再次傳送資料時是無效的，例如使用websocat命令時，出現WebSocketError: I/O failure。

3 ingress樣例

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    # 根據實際情況調整超時時間，預設值為60
    nginx.ingress.kubernetes.io/proxy-read-timeout: "600"
    nginx.ingress.kubernetes.io/proxy-send-timeout: "600"
  name: ws
  namespace: default
spec:
  rules:
  - host: apigateway
    http:
      paths:
      - backend:
          serviceName: ws
          servicePort: 3000
        path: /

4 部署

4.1 部署nginx ingress

將以下檔案進行kubectl apply，本案例中是以daemonset形式部署nginx controller，使用host網路。

apiVersion: v1
kind: Namespace
metadata:
  name: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-ngin
---
kind: ConfigMap
  name: nginx-configuration
  namespace: ingress-nginx
  name: tcp-services
  name: udp-services
data:
  resolv.conf: |
    nameserver 10.96.0.10
    search default.svc.cluster.local svc.cluster.local cluster.local lj.io
    options ndots:5
  name: resolver
kind: ServiceAccount
  name: nginx-ingress-serviceaccount
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
  name: nginx-ingress-clusterrole
rules:
  - apiGroups:
      - ""
    resources:
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
    verbs:
      - list
      - watch
      - get
      - services
      - "extensions"
      - "networking.k8s.io"
      - ingresses
      - update
      - events
      - create
      - patch
      - ingresses/status
kind: Role
  name: nginx-ingress-role
      - namespaces
    resourceNames:
      # Defaults to "<election-id>-<ingress-class>"
      # Here: "<ingress-controller-leader>-<nginx>"
      # This has to be adapted if you change either parameter
      # when launching the nginx-ingress-controller.
      - "ingress-controller-leader-nginx"
kind: RoleBinding
  name: nginx-ingress-role-nisa-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount
    namespace: ingress-nginx
kind: ClusterRoleBinding
  name: nginx-ingress-clusterrole-nisa-binding
  kind: ClusterRole
kind: Service
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
  sessionAffinity: None
  type: ClusterIP
apiVersion: apps/v1
kind: DaemonSet
  name: nginx-ingress-controller
    matchLabels:
      app.kubernetes.io/name: ingress-nginx
      app.kubernetes.io/part-of: ingress-nginx
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
      annotations:
        prometheus.io/port: "10254"
        prometheus.io/scrape: "true"
    spec:
      serviceAccountName: nginx-ingress-serviceaccount
      hostNetwork: true
      dnsPolicy: ClusterFirstWithHostNet
      containers:
        - name: nginx-ingress-controller
          image: bitnami/nginx-ingress-controller:0.47.0
          args:
            - /nginx-ingress-controller
            - --configmap=$(POD_NAMESPACE)/nginx-configuration
            - --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
            - --udp-services-configmap=$(POD_NAMESPACE)/udp-services
            - --publish-service=$(POD_NAMESPACE)/ingress-nginx
            - --annotations-prefix=nginx.ingress.kubernetes.io
          securityContext:
            allowPrivilegeEscalation: true
            capabilities:
              drop:
                - ALL
              add:
                - NET_BIND_SERVICE
            # www-data -> 33
            runAsUser: 33
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
                  fieldPath: metadata.namespace
          ports:
            - name: http
              containerPort: 80
            - name: https
              containerPort: 443
          livenessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          readinessProbe:

部署效果如下，

4.2 設定域名

在本案例中使用/etc/hosts檔案解析域名，本機機器IP是192.168.0.70。

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.0.70 apigateway

4.3 部署websocket伺服器端

伺服器端程序監聽的埠是3000，是簡單的echo server。

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: ws
  name: ws
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      app: ws
  template:
    metadata:
      labels:
        app: ws
    spec:
      containers:
      - image: elegantmonkeys/websockets-demo:latest
        imagePullPolicy: IfNotPresent
        name: echo
        ports:
        - containerPort: 3000
          protocol: TCP
        resources:
          limits:
            cpu: "0.2"
            memory: 100Mi
          requests:
            cpu: 100m
            memory: 100Mi

---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: ws
  name: ws
  namespace: default
spec:
  ports:
  - name: ws
    port: 3000
    protocol: TCP
    targetPort: 3000
  selector:
    app: ws
  type: NodePort

4.4 建立ingress資源

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    # 根據實際情況調整超時時間，預設值為60
    nginx.ingress.kubernetes.io/proxy-read-timeout: "600"
    nginx.ingress.kubernetes.io/proxy-send-timeout: "600"
  name: ws
  namespace: default
spec:
  rules:
  - host: apigateway
    http:
      paths:
      - backend:
          serviceName: ws
          servicePort: 3000
        path: /

4.5 下載websockt使用者端

cd /tmp
wget -O websocat https://github.com/vi/websocat/releases/download/v1.9.0/websocat_linux64
chmod 755 websocat 
mv websocat /usr/bin/

4.6 測試

使用websocat命令通過ingress nginx連線echo server。

5 小結：

ingress nginx預設支援websocket協定，使用長連線協定時需要注意連線超時的設定，讀取和傳送超時的註解引數分別是：nginx.ingress.kubernetes.io/proxy-read-timeout和nginx.ingress.kubernetes.io/proxy-send-timeout。

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