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# AWS::EC2::EC2Fleet FleetLaunchTemplateSpecificationRequest

Specifies the launch template to be used by the EC2 Fleet for configuring Amazon EC2 instances.
You must specify the following:
+ The ID or the name of the launch template, but not both.
+ The version of the launch template.
`FleetLaunchTemplateSpecificationRequest` is a property of the [FleetLaunchTemplateConfigRequest](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-ec2fleet-fleetlaunchtemplateconfigrequest.html) property type.
For information about creating a launch template, see [AWS::EC2::LaunchTemplate](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-launchtemplate.html) and [Create a launch template](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-launch-templates.html#create-launch-template) in the *Amazon EC2 User Guide*.
For examples of launch templates, see [Examples](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-launchtemplate.html#aws-resource-ec2-launchtemplate--examples).
## Syntax

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

```
{
 "[LaunchTemplateId](#cfn-ec2-ec2fleet-fleetlaunchtemplatespecificationrequest-launchtemplateid)" : {{String}},
 "[LaunchTemplateName](#cfn-ec2-ec2fleet-fleetlaunchtemplatespecificationrequest-launchtemplatename)" : {{String}},
 "[LaunchTemplateSpecificationUserData](#cfn-ec2-ec2fleet-fleetlaunchtemplatespecificationrequest-launchtemplatespecificationuserdata)" : {{String}},
 "[Version](#cfn-ec2-ec2fleet-fleetlaunchtemplatespecificationrequest-version)" : {{String}}
}
```
### YAML

```
 [LaunchTemplateId](#cfn-ec2-ec2fleet-fleetlaunchtemplatespecificationrequest-launchtemplateid): {{String}}
 [LaunchTemplateName](#cfn-ec2-ec2fleet-fleetlaunchtemplatespecificationrequest-launchtemplatename): {{String}}
 [LaunchTemplateSpecificationUserData](#cfn-ec2-ec2fleet-fleetlaunchtemplatespecificationrequest-launchtemplatespecificationuserdata): {{String}}
 [Version](#cfn-ec2-ec2fleet-fleetlaunchtemplatespecificationrequest-version): {{String}}
```
## Properties

`LaunchTemplateId` 
The ID of the launch template. 
You must specify the `LaunchTemplateId` or the `LaunchTemplateName`, but not both. 
*Required*: Conditional 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`LaunchTemplateName` 
The name of the launch template. 
You must specify the `LaunchTemplateName` or the `LaunchTemplateId`, but not both. 
*Required*: Conditional 
*Type*: String 
*Pattern*: `[a-zA-Z0-9\(\)\.\-/_]+` 
*Minimum*: `3` 
*Maximum*: `128` 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`LaunchTemplateSpecificationUserData` 
Property description not available. 
*Required*: No 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`Version` 
The launch template version number, `$Latest`, or `$Default`. You must specify a value, otherwise the request fails. 
If the value is `$Latest`, Amazon EC2 uses the latest version of the launch template. 
If the value is `$Default`, Amazon EC2 uses the default version of the launch template. 
*Required*: Yes 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
## See also

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