CDK脚本配置Glue Job故障告警报错：Rule需在Stack作用域创建

错误原因 #

你创建Rule和CloudWatch Alarm时，传入的作用域是构造函数的scope参数，而非当前的InfraStack实例（this）。CDK要求所有资源必须归属到某个Stack的作用域下，否则会抛出找不到Stack的错误。

修复方案 #

把创建Rule和cloudwatch.Alarm的第一个参数从scope改为this，让资源挂载到当前InfraStack的作用域内：

修改后的完整代码 #

export interface InfraStackProps extends VpcStackProps {
  stageName?: string;
}

export class InfraStack extends VpcStack {
  constructor(scope: Construct, id: string, props: InfraStackProps ) {
    super(scope, id, props);
    // jobName. This is our AWS Glue script to monitor
    const jobFailedRule = new Rule(this, '{DVRD replication} JobFailureRule', {
      eventPattern: {
        source: ['aws.glue'],
        detailType: ['Glue Job State Change'],
        detail: {
          state: ['FAILED', 'TIMEOUT', 'ERROR'],
          jobName: ['DVRD replication'],
        },
      },
    })
    
    //cloudwatch metric
    const numFailedJobsMetric = new cloudwatch.Metric({
      namespace: 'AWS/Events',
      metricName: 'TriggeredRules',
      statistic: 'Sum',
      dimensionsMap: {
        RuleName: jobFailedRule.ruleName,
      },
    })
    
    //cloudwatch alarm
    const numFailedJobsAlarm = new cloudwatch.Alarm(this, '{DVRD replication} numFailedJobsAlarm', {
      metric: numFailedJobsMetric,
      threshold: 1,
      evaluationPeriods: 1,
    });
    
    
    // Adding an SNS action and an email registration 
    const notificationsTopic = new Topic(this, 'Topic'); 
    numFailedJobsAlarm.addAlarmAction(new SnsAction(notificationsTopic));
    notificationsTopic.addSubscription(new EmailSubscription('trst@gmail.com'));
}

说明 #

• this在当前类中代表InfraStack实例，而InfraStack继承自VpcStack（最终继承CDK的Stack类），所以将资源挂载到this下，CDK就能正确识别它们属于当前Stack，解决报错问题。
• 你创建SNS Topic时已经用了this，这部分是正确的，只需要修正Rule和Alarm的作用域参数即可。

内容的提问来源于stack exchange，提问作者Marcus