通过服务网格ASM，可以将一个应用的服务组件部署在同VPC的多个集群上。本文以Bookinfo应用为例，介绍如何将该应用部署到包含两个集群的ASM实例。

前提条件

步骤一：修改集群的安全组名称

将两个集群对应的安全组名称修改为易于辨识的名称，本例中为m1c1-sg和m1c2-sg。

  1. 登录ECS管理控制台。
  2. 在左侧导航栏，选择网络与安全 > 安全组。
  3. 在顶部菜单栏左上角处，选择地域。
  4. 在安全组列表页面中，找到需要修改的安全组，单击操作列下的修改。
  5. 在弹出的对话框中，修改安全组名称和描述。
  6. 单击确定。
修改后的名称，如下图所示。修改安全组名称

步骤二：配置集群的互访联通性

为了使两个集群能够互相访问，需要为彼此添加安全组访问规则。

  1. 在m1c1-sg安全组配置界面，添加以m1c2-sg为授权对象的访问规则。详情请参见添加安全组规则。在m1c1授权m1c2
  2. 在m1c2-sg安全组规则配置界面，添加以m1c1-sg为授权对象的访问规则。在m1c2授权m1c1

步骤三：添加集群到ASM实例并部署集群的入口网关

将两个集群添加到ASM实例后，由于两个集群已实现访问互通，因此只需为一个集群部署入口网关。

  1. 将两个集群添加到ASM实例，详情请参见添加集群到ASM实例。
  2. 为m1c1集群部署入口网关，详情请参见添加入口网关服务。

步骤四：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. 在m1c2中部署不包含review-v3 deployment的Bookinfo应用，详情请参见部署应用到ASM实例。
    说明 Review-v3 deployment对应的功能是书评中显示红色星。
    对应的YAML文件内容如下所示： 
    # 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: docker.io/istio/examples-bookinfo-details-v1:1.15.0
        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: docker.io/istio/examples-bookinfo-ratings-v1:1.15.0
        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: docker.io/istio/examples-bookinfo-reviews-v1:1.15.0
        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: docker.io/istio/examples-bookinfo-reviews-v2:1.15.0
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 9080
 ---
# 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: docker.io/istio/examples-bookinfo-reviews-v3:1.15.0
#         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: docker.io/istio/examples-bookinfo-productpage-v1:1.15.0
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 9080
---
  2. 在m1c1中部署review-v3以及rating service（review依赖的服务）。
    对应的YAML文件内容如下所示： 
    # 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: docker.io/istio/examples-bookinfo-reviews-v3:1.15.0
        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

步骤五：添加虚拟服务和Istio网关

  1. 在ASM实例的default命名空间下新建一个虚拟服务，名为bookinfo，详情请参见定义Istio资源。
    对应的YAML文件内容如下所示： 
    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Istio网关，名为bookinfo-gateway，详情参见定义Istio资源。
    对应的YAML文件内容如下所示： 
    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:
    - "*"

访问productpage页面，刷新页面时会轮流显示reviews的3个版本。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）步骤六：指定reviews总是用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目标规则，名为reviews。
    YAML文件的内容如下所示： 
    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虚拟服务，名为reviews。
    对应的YAML文件内容如下所示： 
    apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: reviews
spec:
  hosts:
    - reviews
  http:
  - route:
    - destination:
        host: reviews
        subset: v3
此时访问productpage页面，reviews将始终使用v3版本，即书评中为红色星。书评用红星