# TaskDefinitionPlacementConstraintProperty

The constraint on task placement in the task definition.

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

> Task placement constraints aren't supported for tasks run on AWS Fargate .

- Source: Generated code
- Type last changed: v2.93.0 · 23 Aug 2023

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import { aws_ecs as ecs } from 'aws-cdk-lib';
const taskDefinitionPlacementConstraintProperty: ecs.CfnTaskDefinition.TaskDefinitionPlacementConstraintProperty = {
  type: 'type',

  // the properties below are optional
  expression: 'expression',
};
```

## Properties

- `expression`: string — A cluster query language expression to apply to the constraint.

  For more information, see [Cluster query language](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/cluster-query-language.html) in the *Amazon Elastic Container Service Developer Guide* .

- `type`: string (required) — The type of constraint.

  The `MemberOf` constraint restricts selection to be from a group of valid candidates.