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::EC2Fleet Placement

Describes the placement of an instance.
## Syntax

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

```
{
 "[Affinity](#cfn-ec2-ec2fleet-placement-affinity)" : {{String}},
 "[AvailabilityZone](#cfn-ec2-ec2fleet-placement-availabilityzone)" : {{String}},
 "[GroupName](#cfn-ec2-ec2fleet-placement-groupname)" : {{String}},
 "[HostId](#cfn-ec2-ec2fleet-placement-hostid)" : {{String}},
 "[HostResourceGroupArn](#cfn-ec2-ec2fleet-placement-hostresourcegrouparn)" : {{String}},
 "[PartitionNumber](#cfn-ec2-ec2fleet-placement-partitionnumber)" : {{Integer}},
 "[SpreadDomain](#cfn-ec2-ec2fleet-placement-spreaddomain)" : {{String}},
 "[Tenancy](#cfn-ec2-ec2fleet-placement-tenancy)" : {{String}}
}
```
### YAML

```
 [Affinity](#cfn-ec2-ec2fleet-placement-affinity): {{String}}
 [AvailabilityZone](#cfn-ec2-ec2fleet-placement-availabilityzone): {{String}}
 [GroupName](#cfn-ec2-ec2fleet-placement-groupname): {{String}}
 [HostId](#cfn-ec2-ec2fleet-placement-hostid): {{String}}
 [HostResourceGroupArn](#cfn-ec2-ec2fleet-placement-hostresourcegrouparn): {{String}}
 [PartitionNumber](#cfn-ec2-ec2fleet-placement-partitionnumber): {{Integer}}
 [SpreadDomain](#cfn-ec2-ec2fleet-placement-spreaddomain): {{String}}
 [Tenancy](#cfn-ec2-ec2fleet-placement-tenancy): {{String}}
```
## Properties

`Affinity` 
The affinity setting for the instance on the Dedicated Host. 
This parameter is not supported for [CreateFleet](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateFleet) or [ImportInstance](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_ImportInstance.html). 
*Required*: No 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`AvailabilityZone` 
The Availability Zone of the instance. 
On input, you can specify `AvailabilityZone` or `AvailabilityZoneId`, but not both. If you specify neither one, Amazon EC2 automatically selects an Availability Zone for you. 
This parameter is not supported for [CreateFleet](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateFleet). 
*Required*: No 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`GroupName` 
The name of the placement group that the instance is in. 
On input, you can specify `GroupId` or `GroupName`, but not both. 
*Required*: No 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`HostId` 
The ID of the Dedicated Host on which the instance resides. 
This parameter is not supported for [CreateFleet](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateFleet) or [ImportInstance](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_ImportInstance.html). 
*Required*: No 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`HostResourceGroupArn` 
The ARN of the host resource group in which to launch the instances. 
On input, if you specify this parameter, either omit the **Tenancy** parameter or set it to `host`. 
This parameter is not supported for [CreateFleet](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateFleet). 
*Required*: No 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`PartitionNumber` 
The number of the partition that the instance is in. Valid only if the placement group strategy is set to `partition`. 
This parameter is not supported for [CreateFleet](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateFleet). 
*Required*: No 
*Type*: Integer 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`SpreadDomain` 
Reserved for future use. 
*Required*: No 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`Tenancy` 
The tenancy of the instance. An instance with a tenancy of `dedicated` runs on single-tenant hardware. 
This parameter is not supported for [CreateFleet](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateFleet). The `host` tenancy is not supported for [ImportInstance](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_ImportInstance.html) or for T3 instances that are configured for the `unlimited` CPU credit option. 
*Required*: No 
*Type*: String 
*Allowed values*: `default | dedicated | host` 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-properties-ec2-ec2fleet-placement.md">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-properties-ec2-ec2fleet-placement.md" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>