This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).
# AWS::EC2::LaunchTemplate CapacityReservationSpecification

Specifies an instance's Capacity Reservation targeting option. You can specify only one option at a time.
`CapacityReservationSpecification` is a property of [AWS::EC2::LaunchTemplate LaunchTemplateData](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-launchtemplate-launchtemplatedata.html).
## Syntax

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

```
{
 "[CapacityReservationPreference](#cfn-ec2-launchtemplate-capacityreservationspecification-capacityreservationpreference)" : {{String}},
 "[CapacityReservationTarget](#cfn-ec2-launchtemplate-capacityreservationspecification-capacityreservationtarget)" : {{CapacityReservationTarget}}
}
```
### YAML

```
 [CapacityReservationPreference](#cfn-ec2-launchtemplate-capacityreservationspecification-capacityreservationpreference): {{String}}
 [CapacityReservationTarget](#cfn-ec2-launchtemplate-capacityreservationspecification-capacityreservationtarget): {{
 CapacityReservationTarget}}
```
## Properties

`CapacityReservationPreference` 
Indicates the instance's Capacity Reservation preferences. Possible preferences include: 
+ `capacity-reservations-only` - The instance will only run in a Capacity Reservation or Capacity Reservation group. If capacity isn't available, the instance will fail to launch.
+ `open` - The instance can run in any `open` Capacity Reservation that has matching attributes (instance type, platform, Availability Zone, tenancy).
+ `none` - The instance avoids running in a Capacity Reservation even if one is available. The instance runs in On-Demand capacity.
*Required*: No 
*Type*: String 
*Allowed values*: `capacity-reservations-only | open | none` 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`CapacityReservationTarget` 
Information about the target Capacity Reservation or Capacity Reservation group. 
*Required*: No 
*Type*: [CapacityReservationTarget](aws-properties-ec2-launchtemplate-capacityreservationtarget.md) 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)</div><div class="naked_ctrl">
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