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# AWS::EC2::EC2Fleet TargetCapacitySpecificationRequest

Specifies the number of units to request for an EC2 Fleet. You can choose to set the target capacity in terms of instances or a performance characteristic that is important to your application workload, such as vCPUs, memory, or I/O. If the request type is `maintain`, you can specify a target capacity of `0` and add capacity later.
`TargetCapacitySpecificationRequest` is a property of the [AWS::EC2::EC2Fleet](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-ec2fleet.html) resource.
## Syntax

To declare this entity in your CloudFormation template, use the following syntax:
### JSON

```
{
 "[DefaultTargetCapacityType](#cfn-ec2-ec2fleet-targetcapacityspecificationrequest-defaulttargetcapacitytype)" : {{String}},
 "[OnDemandTargetCapacity](#cfn-ec2-ec2fleet-targetcapacityspecificationrequest-ondemandtargetcapacity)" : {{Integer}},
 "[SpotTargetCapacity](#cfn-ec2-ec2fleet-targetcapacityspecificationrequest-spottargetcapacity)" : {{Integer}},
 "[TargetCapacityUnitType](#cfn-ec2-ec2fleet-targetcapacityspecificationrequest-targetcapacityunittype)" : {{String}},
 "[TotalTargetCapacity](#cfn-ec2-ec2fleet-targetcapacityspecificationrequest-totaltargetcapacity)" : {{Integer}}
}
```
### YAML

```
 [DefaultTargetCapacityType](#cfn-ec2-ec2fleet-targetcapacityspecificationrequest-defaulttargetcapacitytype): {{String}}
 [OnDemandTargetCapacity](#cfn-ec2-ec2fleet-targetcapacityspecificationrequest-ondemandtargetcapacity): {{Integer}}
 [SpotTargetCapacity](#cfn-ec2-ec2fleet-targetcapacityspecificationrequest-spottargetcapacity): {{Integer}}
 [TargetCapacityUnitType](#cfn-ec2-ec2fleet-targetcapacityspecificationrequest-targetcapacityunittype): {{String}}
 [TotalTargetCapacity](#cfn-ec2-ec2fleet-targetcapacityspecificationrequest-totaltargetcapacity): {{Integer}}
```
## Properties

`DefaultTargetCapacityType` 
The default target capacity type. 
*Required*: No 
*Type*: String 
*Allowed values*: `on-demand | spot | capacity-block | reserved-capacity` 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`OnDemandTargetCapacity` 
The number of On-Demand units to request. 
*Required*: No 
*Type*: Integer 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`SpotTargetCapacity` 
The number of Spot units to request. 
*Required*: No 
*Type*: Integer 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`TargetCapacityUnitType` 
The unit for the target capacity. You can specify this parameter only when using attributed-based instance type selection. 
Default: `units` (the number of instances) 
*Required*: No 
*Type*: String 
*Allowed values*: `vcpu | memory-mib | units` 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`TotalTargetCapacity` 
The number of units to request, filled using the default target capacity type. 
*Required*: Yes 
*Type*: Integer 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
## See also

+ [ TargetCapacitySpecificationRequest](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_TargetCapacitySpecificationRequest.html) in the *Amazon EC2 API Reference*</div><div class="naked_ctrl">
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