Interface CfnAutoScalingGroup.IInstancesDistributionProperty
Use this structure to specify the distribution of On-Demand Instances and Spot Instances and the allocation strategies used to fulfill On-Demand and Spot capacities for a mixed instances policy.
Namespace: Amazon.CDK.AWS.AutoScaling
Assembly: Amazon.CDK.AWS.AutoScaling.dll
Syntax (csharp)
public interface IInstancesDistributionPropertySyntax (vb)
Public Interface IInstancesDistributionPropertyRemarks
For more information, see Auto Scaling groups with multiple instance types and purchase options in the Amazon EC2 Auto Scaling User Guide .
InstancesDistribution is a property of the AWS::AutoScaling::AutoScalingGroup MixedInstancesPolicy property type.
ExampleMetadata: fixture=_generated
Examples
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
using Amazon.CDK.AWS.AutoScaling;
var instancesDistributionProperty = new InstancesDistributionProperty {
OnDemandAllocationStrategy = "onDemandAllocationStrategy",
OnDemandBaseCapacity = 123,
OnDemandPercentageAboveBaseCapacity = 123,
SpotAllocationStrategy = "spotAllocationStrategy",
SpotInstancePools = 123,
SpotMaxPrice = "spotMaxPrice"
};Synopsis
Properties
| OnDemandAllocationStrategy | The allocation strategy to apply to your On-Demand Instances when they are launched. |
| OnDemandBaseCapacity | The minimum amount of the Auto Scaling group's capacity that must be fulfilled by On-Demand Instances. |
| OnDemandPercentageAboveBaseCapacity | Controls the percentages of On-Demand Instances and Spot Instances for your additional capacity beyond |
| SpotAllocationStrategy | The allocation strategy to apply to your Spot Instances when they are launched. |
| SpotInstancePools | The number of Spot Instance pools across which to allocate your Spot Instances. |
| SpotMaxPrice | The maximum price per unit hour that you are willing to pay for a Spot Instance. |
Properties
OnDemandAllocationStrategy
The allocation strategy to apply to your On-Demand Instances when they are launched.
virtual string OnDemandAllocationStrategy { get; }Property Value
System.String
Remarks
Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
OnDemandBaseCapacity
The minimum amount of the Auto Scaling group's capacity that must be fulfilled by On-Demand Instances.
virtual Nullable<double> OnDemandBaseCapacity { get; }Property Value
System.Nullable<System.Double>
Remarks
This base portion is launched first as your group scales.
This number has the same unit of measurement as the group's desired capacity. If you change the default unit of measurement (number of instances) by specifying weighted capacity values in your launch template overrides list, or by changing the default desired capacity type setting of the group, you must specify this number using the same unit of measurement.
Default: 0
An update to this setting means a gradual replacement of instances to adjust the current On-Demand Instance levels. When replacing instances, Amazon EC2 Auto Scaling launches new instances before terminating the previous ones.
OnDemandPercentageAboveBaseCapacity
Controls the percentages of On-Demand Instances and Spot Instances for your additional capacity beyond OnDemandBaseCapacity .
virtual Nullable<double> OnDemandPercentageAboveBaseCapacity { get; }Property Value
System.Nullable<System.Double>
Remarks
Expressed as a number (for example, 20 specifies 20% On-Demand Instances, 80% Spot Instances). If set to 100, only On-Demand Instances are used.
Default: 100
An update to this setting means a gradual replacement of instances to adjust the current On-Demand and Spot Instance levels for your additional capacity higher than the base capacity. When replacing instances, Amazon EC2 Auto Scaling launches new instances before terminating the previous ones.
SpotAllocationStrategy
The allocation strategy to apply to your Spot Instances when they are launched.
virtual string SpotAllocationStrategy { get; }Property Value
System.String
Remarks
Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
SpotInstancePools
The number of Spot Instance pools across which to allocate your Spot Instances.
virtual Nullable<double> SpotInstancePools { get; }Property Value
System.Nullable<System.Double>
Remarks
The Spot pools are determined from the different instance types in the overrides. Valid only when the SpotAllocationStrategy is lowest-price . Value must be in the range of 1–20.
Default: 2
SpotMaxPrice
The maximum price per unit hour that you are willing to pay for a Spot Instance.
virtual string SpotMaxPrice { get; }Property Value
System.String
Remarks
If your maximum price is lower than the Spot price for the instance types that you selected, your Spot Instances are not launched. We do not recommend specifying a maximum price because it can lead to increased interruptions. When Spot Instances launch, you pay the current Spot price. To remove a maximum price that you previously set, include the property but specify an empty string ("") for the value.
If you specify a maximum price, your instances will be interrupted more frequently than if you do not specify one.
Valid Range: Minimum value of 0.001