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通過阿里云服務網(wǎng)格ASM，您可以在同一VPC內(nèi)的多個Kubernetes集群上部署應用服務組件，并配置一個統(tǒng)一的Serverless入口網(wǎng)關(guān)代理多集群的入口流量，從而提升整體服務的可用性、降低計算資源成本。

前提條件

在同一VPC下，已創(chuàng)建兩個ACK集群（本示例為m1c1和m1c2）。具體操作，請參見創(chuàng)建ACK專有集群或創(chuàng)建ACK托管集群。
說明
在創(chuàng)建集群時，建議使用企業(yè)安全組。
已創(chuàng)建一個ASM實例（本示例為mesh1），且版本為1.18.0.139及以上。

步驟一：確認兩個集群的互訪聯(lián)通性

默認情況下，同一個VPC下的兩個集群，如果使用了企業(yè)安全組，默認能夠互相訪問。如果使用普通安全組或者兩個安全組訪問不通，則需要為彼此添加安全組訪問規(guī)則。具體操作，請參見添加安全組規(guī)則。

步驟二：添加集群到ASM實例并創(chuàng)建Serverless入口網(wǎng)關(guān)

將兩個集群添加到ASM實例后，創(chuàng)建一個Serverless入口網(wǎng)關(guān)。

將兩個集群添加到ASM實例。具體操作，請參見添加集群到ASM實例。

使用以下YAML，創(chuàng)建一個Serverless入口網(wǎng)關(guān)。具體操作，請參見創(chuàng)建入口網(wǎng)關(guān)服務。

展開查看Serverless入口網(wǎng)關(guān)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

步驟三：部署B(yǎng)ookinfo應用

為了演示ASM跨集群的應用部署能力，Bookinfo應用的不同微服務分別部署在兩個集群上。

使用以下內(nèi)容，在m1c2集群中創(chuàng)建bookinfo-m1c2.yaml。

說明

review-v3 deployment對應的功能是書評中顯示紅色星。

展開查看Bookinfo應用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
---

執(zhí)行以下命令，在m1c2集群中部署不包含review-v3 deployment的Bookinfo應用。
```
kubectl apply -f bookinfo-m1c2.yaml
```

使用以下內(nèi)容，在m1c1集群中創(chuàng)建bookinfo-m1c1.yaml。

展開查看YAML內(nèi)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

執(zhí)行以下命令，在m1c1集群中部署review-v3和ratting service。
```
kubectl apply -f bookinfo-m1c1.yaml
```

步驟四：添加虛擬服務和網(wǎng)關(guān)規(guī)則

在ASM實例的default命名空間下，新建一個名為bookinfo的虛擬服務。具體操作，請參見管理虛擬服務。

展開查看虛擬服務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

在ASM實例的default命名空間下，新建一個名為bookinfo-gateway的網(wǎng)關(guān)規(guī)則。具體操作，請參見管理網(wǎng)關(guān)規(guī)則。

展開查看網(wǎng)關(guān)規(guī)則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:
    - "*"

在瀏覽器地址欄，輸入http://{Serverless入口網(wǎng)關(guān)的IP地址}/productpage，并多次刷新頁面。
可以看到頁面出現(xiàn)reviews的3個版本，且比例接近1:1:1。雖然review-v3和其他服務不在同一個集群中，也可以正常顯示。

（可選）步驟五：指定reviews總是使用v3版本

通過定義目標規(guī)則和虛擬服務，可以定義Bookinfo應用的微服務部署策略。本例中將指定Bookinfo總是使用review v3版本。

在ASM實例的default命名空間下，新建一個名為reviews的目標規(guī)則。具體操作，請參見管理虛擬服務。

展開查看目標規(guī)則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

在ASM實例的default命名空間下，新建一個名為reviews的虛擬服務。具體操作，請參見管理虛擬服務。