AWS::ECS::Service PlacementConstraint - AWS CloudFormation

AWS::ECS::Service PlacementConstraint

The PlacementConstraint property specifies an object representing a constraint on task placement in the task definition. For more information, see Task Placement Constraints in the Amazon Elastic Container Service Developer Guide.


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


{ "Expression" : String, "Type" : String }


Expression: String Type: String



A cluster query language expression to apply to the constraint. You cannot specify an expression if the constraint type is distinctInstance. For more information, see Cluster Query Language in the Amazon Elastic Container Service Developer Guide.

Required: No

Type: String

Update requires: Replacement


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.

Required: Yes

Type: String

Allowed values: distinctInstance | memberOf

Update requires: Replacement