7.5.7　部署自定义网关

网关描述了在网格边缘操作的负载均衡器，用于接收传入或传出的HTTP/TCP连接。使用如下yaml定义中提供的声明来部署自定义网关应用：

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: istio-myexample-customingressgateway
  namespace: default
  labels:
    chart: gateways-1.2.3
    release: myexample-customingressgateway
    heritage: Tiller
    app: istio-myexample-customingressgateway
    istio: istio-myexample-customingressgateway
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: istio-myexample-customingressgateway
        istio: istio-myexample-customingressgateway
      annotations:
        sidecar.istio.io/inject: "false"
        scheduler.alpha.kubernetes.io/critical-pod: ""
    spec:
      serviceAccountName: istio-myexample-customingressgateway-service-account
      containers:
        - name: istio-proxy
          image: "registry.cn-beijing.aliyuncs.com/aliacs-app-catalog/proxyv2:1.2.3"
          imagePullPolicy:
          ports:
            - containerPort: 80
            - containerPort: 443

          args:
          - proxy
          - router
          - -v
          - "2"
          - --discoveryRefreshDelay
          - '1s' #discoveryRefreshDelay
          - --drainDuration
          - '45s' #drainDuration
          - --parentShutdownDuration
          - '1m0s' #parentShutdownDuration
          - --connectTimeout
          - '10s' #connectTimeout
          - --serviceCluster
          - istio-myexample-customingressgateway
          - --zipkinAddress
          - zipkin.istio-system:9411
          - --proxyAdminPort
          - "15000"
          - --controlPlaneAuthPolicy
          - NONE
          - --discoveryAddress
          - istio-pilot.istio-system:8080
          resources:
            null

          env:
          - name: POD_NAME
            valueFrom:
              fieldRef:
                apiVersion: v1
                fieldPath: metadata.name
          - name: POD_NAMESPACE
            valueFrom:
              fieldRef:
                apiVersion: v1
                fieldPath: metadata.namespace
          - name: INSTANCE_IP
            valueFrom:
              fieldRef:
                apiVersion: v1
                fieldPath: status.podIP
          - name: ISTIO_META_POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name
          volumeMounts:
          - name: istio-certs
            mountPath: /etc/certs
            readOnly: true
          - name: ingressgateway-certs
            mountPath: "/etc/istio/ingressgateway-certs"
            readOnly: true
          - name: ingressgateway-ca-certs
            mountPath: "/etc/istio/ingressgateway-ca-certs"
            readOnly: true
      volumes:
      - name: istio-certs
        secret:
          secretName: istio.istio-myexample-customingressgateway-service-account
          optional: true
      - name: ingressgateway-certs
        secret:
          secretName: "istio-myexample-customingressgateway-certs"
          optional: true
      - name: ingressgateway-ca-certs
        secret:
          secretName: "istio-ingressgateway-ca-certs"
          optional: true
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: beta.kubernetes.io/arch
                operator: In
                values:
                - amd64
                - ppc64le
                - s390x
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 2
            preference:
              matchExpressions:
              - key: beta.kubernetes.io/arch
                operator: In
                values:
                - amd64
          - weight: 2
            preference:
              matchExpressions:
              - key: beta.kubernetes.io/arch
                operator: In
                values:
                - ppc64le
          - weight: 2
            preference:
              matchExpressions:
              - key: beta.kubernetes.io/arch
                operator: In
                values:
                - s390x

以下网关配置设置代理以充当负载均衡器，为入口公开端口80和443（https）。使用如下yaml定义中提供的声明来创建自定义网关的服务：

apiVersion: v1
kind: Service
metadata:
  name: istio-myexample-customingressgateway
  namespace: default
  annotations:
  labels:
    chart: gateways-1.2.3
    release: myexample-customingressgateway
    heritage: Tiller
    app: istio-myexample-customingressgateway
    istio: istio-myexample-customingressgateway
spec:
  type: LoadBalancer
  externalTrafficPolicy: Local
  selector:
    app: istio-myexample-customingressgateway
    istio: istio-myexample-customingressgateway
  ports:
    - name: http2
      port: 80
    - name: https
      port: 443