# PlacementStrategy
<a name="API_PlacementStrategy"></a>

The task placement strategy for a task or service. For more information, see [Task placement strategies](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-placement-strategies.html) in the *Amazon Elastic Container Service Developer Guide*.

## Contents
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 ** field **   <a name="ECS-Type-PlacementStrategy-field"></a>
The field to apply the placement strategy against. For the `spread` placement strategy, valid values are `instanceId` (or `host`, which has the same effect), or any platform or custom attribute that's applied to a container instance, such as `attribute:ecs.availability-zone`. For the `binpack` placement strategy, valid values are `cpu` and `memory`. For the `random` placement strategy, this field is not used.  
Type: String  
Required: No

 ** type **   <a name="ECS-Type-PlacementStrategy-type"></a>
The type of placement strategy. The `random` placement strategy randomly places tasks on available candidates. The `spread` placement strategy spreads placement across available candidates evenly based on the `field` parameter. The `binpack` strategy places tasks on available candidates that have the least available amount of the resource that's specified with the `field` parameter. For example, if you binpack on memory, a task is placed on the instance with the least amount of remaining memory but still enough to run the task.  
Type: String  
Valid Values: `random | spread | binpack`   
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/ecs-2014-11-13/PlacementStrategy) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ecs-2014-11-13/PlacementStrategy) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ecs-2014-11-13/PlacementStrategy)