使用ASM Serverless网关实现多集群入口

通过阿里云服务网格ASM,您可以在同一VPC内的多个Kubernetes集群上部署应用服务组件,并配置一个统一的Serverless入口网关代理多集群的入口流量,从而提升整体服务的可用性、降低计算资源成本。

前提条件

步骤一:确认两个集群的互访联通性

默认情况下,同一个VPC下的两个集群,如果使用了企业安全组,默认能够互相访问。如果使用普通安全组或者两个安全组访问不通,则需要为彼此添加安全组访问规则。具体操作,请参见添加安全组规则

步骤二:添加集群到ASM实例并创建Serverless入口网关

将两个集群添加到ASM实例后,创建一个Serverless入口网关。

  1. 将两个集群添加到ASM实例。具体操作,请参见添加集群到ASM实例

  2. 使用以下YAML,创建一个Serverless入口网关。具体操作,请参见创建入口网关服务

    展开查看Serverless入口网关YAML

    apiVersion: istio.alibabacloud.com/v1beta1
    kind: IstioGateway
    metadata:
      annotations:
        asm.alibabacloud.com/managed-by-asm: 'true'
      name: ingressgateway
      namespace: istio-system
    spec:
      gatewayType: ingress
      dnsPolicy: ClusterFirst
      externalTrafficPolicy: Local
      hostNetwork: false
      ports:
        - name: http
          port: 80
          protocol: TCP
          targetPort: 80
        - name: https
          port: 443
          protocol: TCP
          targetPort: 443
      replicaCount: 1
      resources:
        limits:
          cpu: '2'
          memory: 2G
        requests:
          cpu: 200m
          memory: 256Mi
      rollingMaxSurge: 100%
      rollingMaxUnavailable: 25%
      runAsRoot: true
      serviceType: LoadBalancer

步骤三:部署Bookinfo应用

为了演示ASM跨集群的应用部署能力,Bookinfo应用的不同微服务分别部署在两个集群上。

  1. 使用以下内容,在m1c2集群中创建bookinfo-m1c2.yaml。

    说明

    review-v3 deployment对应的功能是书评中显示红色星。

    展开查看Bookinfo应用YAML

    # Details service
    apiVersion: v1
    kind: Service
    metadata:
      name: details
      labels:
        app: details
        service: details
    spec:
      ports:
      - port: 9080
        name: http
      selector:
        app: details
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: bookinfo-details
      labels:
        account: details
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: details-v1
      labels:
        app: details
        version: v1
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: details
          version: v1
      template:
        metadata:
          labels:
            app: details
            version: v1
        spec:
          serviceAccountName: bookinfo-details
          containers:
          - name: details
            image: registry-cn-hangzhou.ack.aliyuncs.com/ack-demo/examples-bookinfo-details-v1:1.19.1
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 9080
    ---
    # Ratings service
    apiVersion: v1
    kind: Service
    metadata:
      name: ratings
      labels:
        app: ratings
        service: ratings
    spec:
      ports:
      - port: 9080
        name: http
      selector:
        app: ratings
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: bookinfo-ratings
      labels:
        account: ratings
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: ratings-v1
      labels:
        app: ratings
        version: v1
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: ratings
          version: v1
      template:
        metadata:
          labels:
            app: ratings
            version: v1
        spec:
          serviceAccountName: bookinfo-ratings
          containers:
          - name: ratings
            image: registry-cn-hangzhou.ack.aliyuncs.com/ack-demo/examples-bookinfo-ratings-v1:1.19.1
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 9080
    ---
    # Reviews service
    apiVersion: v1
    kind: Service
    metadata:
      name: reviews
      labels:
        app: reviews
        service: reviews
    spec:
      ports:
      - port: 9080
        name: http
      selector:
        app: reviews
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: bookinfo-reviews
      labels:
        account: reviews
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: reviews-v1
      labels:
        app: reviews
        version: v1
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: reviews
          version: v1
      template:
        metadata:
          labels:
            app: reviews
            version: v1
        spec:
          serviceAccountName: bookinfo-reviews
          containers:
          - name: reviews
            image: registry-cn-hangzhou.ack.aliyuncs.com/ack-demo/examples-bookinfo-reviews-v1:1.19.1
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 9080
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: reviews-v2
      labels:
        app: reviews
        version: v2
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: reviews
          version: v2
      template:
        metadata:
          labels:
            app: reviews
            version: v2
        spec:
          serviceAccountName: bookinfo-reviews
          containers:
          - name: reviews
            image: registry-cn-hangzhou.ack.aliyuncs.com/ack-demo/examples-bookinfo-reviews-v2:1.19.1
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 9080
    ---
    # Productpage services
    apiVersion: v1
    kind: Service
    metadata:
      name: productpage
      labels:
        app: productpage
        service: productpage
    spec:
      ports:
      - port: 9080
        name: http
      selector:
        app: productpage
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: bookinfo-productpage
      labels:
        account: productpage
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: productpage-v1
      labels:
        app: productpage
        version: v1
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: productpage
          version: v1
      template:
        metadata:
          labels:
            app: productpage
            version: v1
        spec:
          serviceAccountName: bookinfo-productpage
          containers:
          - name: productpage
            image: registry-cn-hangzhou.ack.aliyuncs.com/ack-demo/examples-bookinfo-productpage-v1:1.19.1
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 9080
    ---
  2. 执行以下命令,在m1c2集群中部署不包含review-v3 deployment的Bookinfo应用。

    kubectl apply -f bookinfo-m1c2.yaml
  3. 使用以下内容,在m1c1集群中创建bookinfo-m1c1.yaml。

    展开查看YAML内容

    # Reviews service
    apiVersion: v1
    kind: Service
    metadata:
      name: reviews
      labels:
        app: reviews
        service: reviews
    spec:
      ports:
      - port: 9080
        name: http
      selector:
        app: reviews
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: bookinfo-reviews
      labels:
        account: reviews
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: reviews-v3
      labels:
        app: reviews
        version: v3
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: reviews
          version: v3
      template:
        metadata:
          labels:
            app: reviews
            version: v3
        spec:
          serviceAccountName: bookinfo-reviews
          containers:
          - name: reviews
            image: registry-cn-hangzhou.ack.aliyuncs.com/ack-demo/examples-bookinfo-reviews-v3:1.19.1
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 9080
    ---
    # Ratings service
    apiVersion: v1
    kind: Service
    metadata:
      name: ratings
      labels:
        app: ratings
        service: ratings
    spec:
      ports:
      - port: 9080
        name: http
      selector:
        app: ratings
  4. 执行以下命令,在m1c1集群中部署review-v3和ratting service。

    kubectl apply -f bookinfo-m1c1.yaml

步骤四:添加虚拟服务和网关规则

  1. 在ASM实例的default命名空间下,新建一个名为bookinfo的虚拟服务。具体操作,请参见管理虚拟服务

    展开查看虚拟服务YAML

    apiVersion: networking.istio.io/v1alpha3
    kind: VirtualService
    metadata:
      name: bookinfo
    spec:
      hosts:
      - "*"
      gateways:
      - bookinfo-gateway
      http:
      - match:
        - uri:
            exact: /productpage
        - uri:
            prefix: /static
        - uri:
            exact: /login
        - uri:
            exact: /logout
        - uri:
            prefix: /api/v1/products
        route:
        - destination:
            host: productpage
            port:
              number: 9080
  2. 在ASM实例的default命名空间下,新建一个名为bookinfo-gateway的网关规则。具体操作,请参见管理网关规则

    展开查看网关规则YAML

    apiVersion: networking.istio.io/v1alpha3
    kind: Gateway
    metadata:
      name: bookinfo-gateway
    spec:
      selector:
        istio: ingressgateway # use istio default controller
      servers:
      - port:
          number: 80
          name: http
          protocol: HTTP
        hosts:
        - "*"
  3. 在浏览器地址栏,输入http://{Serverless入口网关的IP地址}/productpage,并多次刷新页面。

    可以看到页面出现reviews的3个版本,且比例接近1:1:1。虽然review-v3和其他服务不在同一个集群中,也可以正常显示。

(可选)步骤五:指定reviews总是使用v3版本

通过定义目标规则和虚拟服务,可以定义Bookinfo应用的微服务部署策略。本例中将指定Bookinfo总是使用review v3版本。

  1. 在ASM实例的default命名空间下,新建一个名为reviews的目标规则。具体操作,请参见管理虚拟服务

    展开查看目标规则YAML

    apiVersion: networking.istio.io/v1alpha3
    kind: DestinationRule
    metadata:
      name: reviews
    spec:
      host: reviews
      subsets:
      - name: v1
        labels:
          version: v1
      - name: v2
        labels:
          version: v2
      - name: v3
        labels:
          version: v3
  2. 在ASM实例的default命名空间下,新建一个名为reviews的虚拟服务。具体操作,请参见管理虚拟服务

    展开查看虚拟服务YAML

    apiVersion: networking.istio.io/v1alpha3
    kind: VirtualService
    metadata:
      name: reviews
    spec:
      hosts:
        - reviews
      http:
      - route:
        - destination:
            host: reviews
            subset: v3
  3. 在浏览器地址栏,输入http://{Serverless入口网关的IP地址}/productpage,并多次刷新页面。

    可以看到reviews始终使用v3版本,即书评中为红色星。书评用红星