amazon-web-services - 我可以在同一个 cloudformation 模板中使用动态和预测扩展吗？

Question

我正在尝试通过 Cloudformation 创建具有动态和预测扩展功能的 ASG。但是，我收到以下错误。我可以在同一模板中同时使用动态和预测缩放吗？

Resource handler returned message: "You can't specify PredictiveScalingConfiguration for policy type: TargetTrackingScaling (Service: AutoScaling, Status Code: 400, Request ID: bd851c95-ad78-4afc-979b-f5e2e5bf188a)" (RequestToken: 387601f6-9734-ac0c-36bc-5e006f892bf2, HandlerErrorCode: GeneralServiceException)

---
Resources:
  myasg:
    Type: AWS::AutoScaling::AutoScalingGroup
    Properties:
      MaxSize: '10'
      MinSize: '2'
      DesiredCapacity: '2'
      VPCZoneIdentifier:
        - subnet1
        - subnet2
      MixedInstancesPolicy:
        InstancesDistribution:
          OnDemandAllocationStrategy: lowest-price
          OnDemandBaseCapacity: 0
          OnDemandPercentageAboveBaseCapacity: 0
          SpotAllocationStrategy: lowest-price
          SpotInstancePools: 2
        LaunchTemplate:
          LaunchTemplateSpecification:
            LaunchTemplateName: mylaunchtemplate
            Version: 1
      Tags:
        - Key: Environment
          Value: Production
          PropagateAtLaunch: true
        - Key: Purpose
          Value: WebServerGroup
          PropagateAtLaunch: false
  scalingpolicy:
    Type: AWS::AutoScaling::ScalingPolicy
    Properties:
      AutoScalingGroupName:
        Ref: myasg
      PolicyType: TargetTrackingScaling
      TargetTrackingConfiguration:
        DisableScaleIn: false
        PredefinedMetricSpecification:
          PredefinedMetricType: ASGAverageCPUUtilization
        TargetValue: 30
      PredictiveScalingConfiguration:
        MaxCapacityBreachBehavior: IncreaseMaxCapacity
        MaxCapacityBuffer: 0
        MetricSpecifications:
          - TargetValue: 30
        Mode: ForecastAndScale

Answer 1

documentation表示“将预测扩展与动态扩展结合使用”是最佳实践。

所以，是的，这应该是可能的。在 CloudFormation 中执行此操作的方法是将多个扩展策略与单个 AutoScalingGroup 关联。

例如(未经测试):

  scalingpolicy1:
    Type: AWS::AutoScaling::ScalingPolicy
    Properties:
      AutoScalingGroupName:
        Ref: myasg
      PolicyType: TargetTrackingScaling
      TargetTrackingConfiguration:
        DisableScaleIn: false
        PredefinedMetricSpecification:
          PredefinedMetricType: ASGAverageCPUUtilization
        TargetValue: 30

  scalingpolicy2:
    Type: AWS::AutoScaling::ScalingPolicy
    Properties:
      AutoScalingGroupName:
        Ref: myasg
      PolicyType: PredictiveScaling
      PredictiveScalingConfiguration:
        MaxCapacityBreachBehavior: IncreaseMaxCapacity
        MaxCapacityBuffer: 0
        MetricSpecifications:
          - TargetValue: 30
        Mode: ForecastAndScale