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::ECS::TaskDefinition RuntimePlatform
<a name="aws-properties-ecs-taskdefinition-runtimeplatform"></a>

Information about the platform for the Amazon ECS service or task.

For more information about `RuntimePlatform`, see [RuntimePlatform](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task_definition_parameters.html#runtime-platform) in the *Amazon Elastic Container Service Developer Guide*.

## Syntax
<a name="aws-properties-ecs-taskdefinition-runtimeplatform-syntax"></a>

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

### JSON
<a name="aws-properties-ecs-taskdefinition-runtimeplatform-syntax.json"></a>

```
{
  "[CpuArchitecture](#cfn-ecs-taskdefinition-runtimeplatform-cpuarchitecture)" : String,
  "[OperatingSystemFamily](#cfn-ecs-taskdefinition-runtimeplatform-operatingsystemfamily)" : String
}
```

### YAML
<a name="aws-properties-ecs-taskdefinition-runtimeplatform-syntax.yaml"></a>

```
  [CpuArchitecture](#cfn-ecs-taskdefinition-runtimeplatform-cpuarchitecture): String
  [OperatingSystemFamily](#cfn-ecs-taskdefinition-runtimeplatform-operatingsystemfamily): String
```

## Properties
<a name="aws-properties-ecs-taskdefinition-runtimeplatform-properties"></a>

`CpuArchitecture`  <a name="cfn-ecs-taskdefinition-runtimeplatform-cpuarchitecture"></a>
The CPU architecture.  
You can run your Linux tasks on an ARM-based platform by setting the value to `ARM64`. This option is available for tasks that run on Linux Amazon EC2 instance, Amazon ECS Managed Instances, or Linux containers on Fargate.  
*Required*: No  
*Type*: String  
*Allowed values*: `X86_64 | ARM64`  
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)

`OperatingSystemFamily`  <a name="cfn-ecs-taskdefinition-runtimeplatform-operatingsystemfamily"></a>
The operating system.  
*Required*: No  
*Type*: String  
*Allowed values*: `WINDOWS_SERVER_2019_FULL | WINDOWS_SERVER_2019_CORE | WINDOWS_SERVER_2016_FULL | WINDOWS_SERVER_2004_CORE | WINDOWS_SERVER_2022_CORE | WINDOWS_SERVER_2022_FULL | WINDOWS_SERVER_2025_CORE | WINDOWS_SERVER_2025_FULL | WINDOWS_SERVER_20H2_CORE | LINUX`  
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)