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Showing content from https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_PlacementConstraint.html below:

PlacementConstraint - Amazon Elastic Container Service

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.

expression

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.

Type: String

Required: No

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.

Type: String

Valid Values: distinctInstance | memberOf

Required: No

For more information about using this API in one of the language-specific AWS SDKs, see the following:

NetworkInterface

PlacementStrategy

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