interface PlacementConstraintProperty

Language	Type name
.NET	`Amazon.CDK.AWS.ECS.CfnService.PlacementConstraintProperty`
Go	`github.com/aws/aws-cdk-go/awscdk/v2/awsecs#CfnService_PlacementConstraintProperty`
Java	`software.amazon.awscdk.services.ecs.CfnService.PlacementConstraintProperty`
Python	`aws_cdk.aws_ecs.CfnService.PlacementConstraintProperty`
TypeScript	`aws-cdk-lib` » `aws_ecs` » `CfnService` » `PlacementConstraintProperty`

An object representing a constraint on task placement.

For more information, see Task placement constraints in the Amazon Elastic Container Service Developer Guide .

If you're using the Fargate launch type, task placement constraints aren't supported.

Example

// 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 placementConstraintProperty: ecs.CfnService.PlacementConstraintProperty = {
  type: 'type',

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

Properties

Name	Type	Description
type	`string`	The type of constraint.
expression?	`string`	A cluster query language expression to apply to the constraint.

type

Type: string

The type of constraint.

Use distinctInstance to ensure that each task in a particular group is running on a different container instance. Use memberOf to restrict the selection to a group of valid candidates.

expression?

Type: string (optional)

A cluster query language expression to apply to the constraint.

The expression can have a maximum length of 2000 characters. You can't specify an expression if the constraint type is distinctInstance . For more information, see Cluster query language in the Amazon Elastic Container Service Developer Guide .