Amazon web services AWS CloudWatch仪表板云信息配置

我试图用一个基本的小部件配置一个仪表板，以公开CpUUtilization度量。 我无法引用之前创建的EC2实例，因为在描述仪表板的json中，似乎！不解释Ref函数

metrics": [
        "AWS/EC2",
        "CPUUtilization",
        "InstanceId",
        "!Ref Ec2Instance"
]

---

知道如何通过逻辑名称引用它吗？

您可以使用

Fn:：Join

将内部函数（如

Ref

）的输出与字符串相结合。例如：

  CloudWatchDashboardHOSTNAME:
    Type: "AWS::CloudWatch::Dashboard"
    DependsOn: Ec2InstanceHOSTNAME
    Properties:
      DashboardName: HOSTNAME
      DashboardBody: { "Fn::Join": [ "", ['{"widgets":[
          {
            "type":"metric",
            "properties":{
              "metrics":[
                ["AWS/EC2","CPUUtilization","InstanceId",
                 "', { Ref: Ec2InstanceHOSTNAME }, '"] 
              ],
              "title":"CPU Utilization",
              "period":60,
              "region":"us-east-1"
            }
          }]}' ] ] } 

文件：