AWSAutoScalingInstancesDistribution

Objective-C

@interface AWSAutoScalingInstancesDistribution

Swift

class AWSAutoScalingInstancesDistribution

Describes an instances distribution for an Auto Scaling group.

  • The order of the launch template overrides to use in fulfilling On-Demand capacity.

    If you specify lowest-price, Amazon EC2 Auto Scaling uses price to determine the order, launching the lowest price first.

    If you specify prioritized, Amazon EC2 Auto Scaling uses the priority that you assigned to each launch template override, launching the highest priority first. If all your On-Demand capacity cannot be fulfilled using your highest priority instance, then Amazon EC2 Auto Scaling launches the remaining capacity using the second priority instance type, and so on.

    Default: lowest-price for Auto Scaling groups that specify InstanceRequirements in the overrides and prioritized for Auto Scaling groups that don’t.

    Declaration

    Objective-C

    @property (nonatomic, strong) NSString *_Nullable onDemandAllocationStrategy;

    Swift

    var onDemandAllocationStrategy: String? { get set }
  • The minimum amount of the Auto Scaling group’s capacity that must be fulfilled by On-Demand Instances. This base portion is launched first as your group scales.

    If you specify weights for the instance types in the overrides, the base capacity is measured in the same unit of measurement as the instance types. If you specify InstanceRequirements in the overrides, the base capacity is measured in the same unit of measurement as your group’s desired capacity.

    Default: 0

    Declaration

    Objective-C

    @property (nonatomic, strong) NSNumber *_Nullable onDemandBaseCapacity;

    Swift

    var onDemandBaseCapacity: NSNumber? { get set }
  • Controls the percentages of On-Demand Instances and Spot Instances for your additional capacity beyond OnDemandBaseCapacity. 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

    Declaration

    Objective-C

    @property (nonatomic, strong) NSNumber *_Nullable onDemandPercentageAboveBaseCapacity;

    Swift

    var onDemandPercentageAboveBaseCapacity: NSNumber? { get set }
  • Indicates how to allocate instances across Spot Instance pools.

    If the allocation strategy is lowest-price, the Auto Scaling group launches instances using the Spot pools with the lowest price, and evenly allocates your instances across the number of Spot pools that you specify.

    If the allocation strategy is capacity-optimized (recommended), the Auto Scaling group launches instances using Spot pools that are optimally chosen based on the available Spot capacity. Alternatively, you can use capacity-optimized-prioritized and set the order of instance types in the list of launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling honors the instance type priorities on a best-effort basis but optimizes for capacity first.

    Default: lowest-price

    Declaration

    Objective-C

    @property (nonatomic, strong) NSString *_Nullable spotAllocationStrategy;

    Swift

    var spotAllocationStrategy: String? { get set }
  • The number of Spot Instance pools across which to allocate your Spot Instances. The Spot pools are determined from the different instance types in the overrides. Valid only when the Spot allocation strategy is lowest-price. Value must be in the range of 1–20.

    Default: 2

    Declaration

    Objective-C

    @property (nonatomic, strong) NSNumber *_Nullable spotInstancePools;

    Swift

    var spotInstancePools: NSNumber? { get set }
  • The maximum price per unit hour that you are willing to pay for a Spot Instance. If you keep the value at its default (unspecified), Amazon EC2 Auto Scaling uses the On-Demand price as the maximum Spot price. To remove a value that you previously set, include the property but specify an empty string (“”) for the value.

    Declaration

    Objective-C

    @property (nonatomic, strong) NSString *_Nullable spotMaxPrice;

    Swift

    var spotMaxPrice: String? { get set }