如何使用Cloud Formation或AWS CLI将扩展策略添加到自动扩展组

Question

如何使用Cloud Formation或AWS CLI将扩展策略添加到新的或现有的自动扩展组

Answer 1

有一个重要的例子，但下面是我现有的一个云形成模板的片段。

1）参数您应该将最小值和最大值作为参数

2）自动缩放组本身我在下面包含它，但是如果你不想包含它，你可以将它作为参数。您还可以使用将使用现有参数作为条件的条件来确定是否应创建ASG。请注意，如果您确实使用了该条件，那么您还将使用in语句对所有引用使用该条件（以确定是否在模板中使用本地ASG或参数）。

3）警报这是自动调整组的关键要素 - 确定警报。我正在使用群集的内存预留，但我会说CPU是最常见的。您可以使用任何指标cloudwatch监视器甚至自定义指标。

4）政策我目前正在迅速做出反应......一个新实例需要大约30-60秒来产生影响，这就是我在事件之间有120秒的原因。您需要了解您的系统才能正确选择合适的数量以避免过度扩展。

ECSClusterAutoScalingGroup:
  Type: 'AWS::AutoScaling::AutoScalingGroup'
  Condition: notDedicated
  Properties:
    VPCZoneIdentifier:
    - 'Fn::ImportValue': !Sub '${VPC}-PrivateSubnet1'
    - 'Fn::ImportValue': !Sub '${VPC}-PrivateSubnet2'
    - 'Fn::ImportValue': !Sub '${VPC}-PrivateSubnet3'
    MinSize: !Ref MinSize
    MaxSize: !Ref MaxSize
    HealthCheckGracePeriod: '600'
    HealthCheckType: EC2
    LaunchConfigurationName: !Ref ECSLaunchConfiguration
    MetricsCollection:
    - Granularity: 1Minute
ECSClusterScaleOutPolicy:
  Type: 'AWS::AutoScaling::ScalingPolicy'
  Condition: AutoScaleNotDedicated
  Properties:
    AdjustmentType: ChangeInCapacity
    AutoScalingGroupName: !Ref ECSClusterAutoScalingGroup
    Cooldown: '120'
    ScalingAdjustment: '1'
ECSClusterScaleOutAlarm:
  Type: 'AWS::CloudWatch::Alarm'
  Condition: AutoScaleNotDedicated
  Properties:
    EvaluationPeriods: '1'
    Statistic: Average
    Threshold: '70'
    AlarmDescription: Scale up alarm when Memory Reservation > 70% for 1 minute
    Period: '60'
    AlarmActions:
    - !Ref ECSClusterScaleOutPolicy
    Namespace: AWS/ECS
    Dimensions:
    - Name: ClusterName
      Value: !Ref ECSCluster
    ComparisonOperator: GreaterThanThreshold
    MetricName: MemoryReservation
ECSClusterScaleInPolicy:
  Type: 'AWS::AutoScaling::ScalingPolicy'
  Condition: AutoScaleNotDedicated
  Properties:
    AdjustmentType: ChangeInCapacity
    AutoScalingGroupName: !Ref ECSClusterAutoScalingGroup
    Cooldown: '120'
    ScalingAdjustment: '-1'
ECSClusterScaleInAlarm:
  Type: 'AWS::CloudWatch::Alarm'
  Condition: AutoScaleNotDedicated
  Properties:
    EvaluationPeriods: '1'
    Statistic: Average
    Threshold: '45'
    AlarmDescription: Scale down alarm when Memory Reservation <= 45% for 5 minutes
    Period: '300'
    AlarmActions:
    - !Ref ECSClusterScaleInPolicy
    Namespace: AWS/ECS
    Dimensions:
    - Name: ClusterName
      Value: !Ref ECSCluster
    ComparisonOperator: LessThanOrEqualToThreshold
    MetricName: MemoryReservation