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Describes a scaling instruction for a scalable resource.
The scaling instruction is used in combination with a scaling plan, which is a set of instructions for configuring dynamic scaling and predictive scaling for the scalable resources in your application. Each scaling instruction applies to one resource.
AWS Auto Scaling creates target tracking scaling policies based on the scaling instructions. Target tracking scaling policies adjust the capacity of your scalable resource as required to maintain resource utilization at the target value that you specified.
AWS Auto Scaling also configures predictive scaling for your Amazon EC2 Auto Scaling groups using a subset of parameters, including the load metric, the scaling metric, the target value for the scaling metric, the predictive scaling mode (forecast and scale or forecast only), and the desired behavior when the forecast capacity exceeds the maximum capacity of the resource. With predictive scaling, AWS Auto Scaling generates forecasts with traffic predictions for the two days ahead and schedules scaling actions that proactively add and remove resource capacity to match the forecast.
We recommend waiting a minimum of 24 hours after creating an Auto Scaling group to configure predictive scaling. At minimum, there must be 24 hours of historical data to generate a forecast.
For more information, see Getting Started with AWS Auto Scaling.
public class ScalingInstruction
The ScalingInstruction type exposes the following members
Gets and sets the property CustomizedLoadMetricSpecification.
The customized load metric to use for predictive scaling. This parameter or a PredefinedLoadMetricSpecification is required when configuring predictive scaling, and cannot be used otherwise.
Gets and sets the property DisableDynamicScaling.
Controls whether dynamic scaling by AWS Auto Scaling is disabled. When dynamic scaling is enabled, AWS Auto Scaling creates target tracking scaling policies based on the specified target tracking configurations.
The default is enabled (
Gets and sets the property MaxCapacity.
The maximum capacity of the resource. The exception to this upper limit is if you specify a non-default setting for PredictiveScalingMaxCapacityBehavior.
Gets and sets the property MinCapacity.
The minimum capacity of the resource.
Gets and sets the property PredefinedLoadMetricSpecification.
The predefined load metric to use for predictive scaling. This parameter or a CustomizedLoadMetricSpecification is required when configuring predictive scaling, and cannot be used otherwise.
Gets and sets the property PredictiveScalingMaxCapacityBehavior.
Defines the behavior that should be applied if the forecast capacity approaches or
exceeds the maximum capacity specified for the resource. The default value is
The following are possible values:
Only valid when configuring predictive scaling.
Gets and sets the property PredictiveScalingMaxCapacityBuffer.
The size of the capacity buffer to use when the forecast capacity is close to or exceeds the maximum capacity. The value is specified as a percentage relative to the forecast capacity. For example, if the buffer is 10, this means a 10 percent buffer, such that if the forecast capacity is 50, and the maximum capacity is 40, then the effective maximum capacity is 55.
Only valid when configuring predictive scaling. Required if the PredictiveScalingMaxCapacityBehavior
is set to
The range is 1-100.
Gets and sets the property PredictiveScalingMode.
The predictive scaling mode. The default value is
Gets and sets the property ResourceId.
The ID of the resource. This string consists of the resource type and unique identifier.
Gets and sets the property ScalableDimension.
The scalable dimension associated with the resource.
Gets and sets the property ScalingPolicyUpdateBehavior.
Controls whether a resource's externally created scaling policies are kept or replaced.
The default value is
Only valid when configuring dynamic scaling.
Condition: The number of existing policies to be replaced must be less than or equal to 50. If there are more than 50 policies to be replaced, AWS Auto Scaling keeps all existing policies and does not create new ones.
Gets and sets the property ScheduledActionBufferTime.
The amount of time, in seconds, to buffer the run time of scheduled scaling actions when scaling out. For example, if the forecast says to add capacity at 10:00 AM, and the buffer time is 5 minutes, then the run time of the corresponding scheduled scaling action will be 9:55 AM. The intention is to give resources time to be provisioned. For example, it can take a few minutes to launch an EC2 instance. The actual amount of time required depends on several factors, such as the size of the instance and whether there are startup scripts to complete.
The value must be less than the forecast interval duration of 3600 seconds (60 minutes). The default is 300 seconds.
Only valid when configuring predictive scaling.
Gets and sets the property ServiceNamespace.
The namespace of the AWS service.
Gets and sets the property TargetTrackingConfigurations.
The structure that defines new target tracking configurations (up to 10). Each of these structures includes a specific scaling metric and a target value for the metric, along with various parameters to use with dynamic scaling.
With predictive scaling and dynamic scaling, the resource scales based on the target tracking configuration that provides the largest capacity for both scale in and scale out.
Condition: The scaling metric must be unique across target tracking configurations.
Supported in: 1.3
Supported in: 4.5, 4.0, 3.5
Portable Class Library:
Supported in: Windows Store Apps
Supported in: Windows Phone 8.1
Supported in: Xamarin Android
Supported in: Xamarin iOS (Unified)
Supported in: Xamarin.Forms