LaunchTemplateOverrides - Amazon EC2 Auto Scaling

LaunchTemplateOverrides

Describes an override for a launch template. For more information, see Configuring overrides in the Amazon EC2 Auto Scaling User Guide.

If you supply your own instance types, the maximum number of instance types that can be associated with an Auto Scaling group is 40. The maximum number of distinct launch templates you can define for an Auto Scaling group is 20.

Contents

InstanceRequirements

The instance requirements. When you specify instance requirements, Amazon EC2 Auto Scaling finds instance types that satisfy your requirements, and then uses your On-Demand and Spot allocation strategies to launch instances from these instance types, in the same way as when you specify a list of specific instance types.

Note

InstanceRequirements are incompatible with the InstanceType property. If you specify both of these properties, Amazon EC2 Auto Scaling will return a ValidationException exception.

Type: InstanceRequirements object

Required: No

InstanceType

The instance type, such as m3.xlarge. You must use an instance type that is supported in your requested Region and Availability Zones. For more information, see Instance types in the Amazon Elastic Compute Cloud User Guide.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 255.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Required: No

LaunchTemplateSpecification

Provides the launch template to be used when launching the instance type specified in InstanceType. For example, some instance types might require a launch template with a different AMI. If not provided, Amazon EC2 Auto Scaling uses the launch template that's defined for your mixed instances policy. For more information, see Specifying a different launch template for an instance type in the Amazon EC2 Auto Scaling User Guide.

Type: LaunchTemplateSpecification object

Required: No

WeightedCapacity

The number of capacity units provided by the instance type specified in InstanceType in terms of virtual CPUs, memory, storage, throughput, or other relative performance characteristic. When a Spot or On-Demand Instance is launched, the capacity units count toward the desired capacity. Amazon EC2 Auto Scaling launches instances until the desired capacity is totally fulfilled, even if this results in an overage. For example, if there are two units remaining to fulfill capacity, and Amazon EC2 Auto Scaling can only launch an instance with a WeightedCapacity of five units, the instance is launched, and the desired capacity is exceeded by three units. For more information, see Instance weighting for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide. Value must be in the range of 1–999.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 3.

Pattern: ^[\u0031-\u0039][\u0030-\u0039]{0,2}$

Required: No

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: