AWS CloudFormation
User Guide (Version )

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.

Syntax

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

JSON

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

YAML

Expression: String Type: String

Properties

Expression

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

Type

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. The value distinctInstance is not supported in task definitions.

Required: Yes

Type: String

Allowed Values: distinctInstance | memberOf

Update requires: Replacement

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