AWS services or capabilities described in AWS Documentation may vary by region/location. Click Getting Started with Amazon AWS to see specific differences applicable to the China (Beijing) Region.

You are viewing documentation for version 2 of the AWS SDK for Ruby. Version 3 documentation can be found here.

Class: Aws::ECS::Types::PlacementConstraint

Inherits:
Struct
  • Object
show all
Defined in:
(unknown)

Overview

Note:

When passing PlacementConstraint as input to an Aws::Client method, you can use a vanilla Hash:

{
  type: "distinctInstance", # accepts distinctInstance, memberOf
  expression: "String",
}

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 are using the Fargate launch type, task placement constraints are not supported.

Instance Attribute Summary collapse

Instance Attribute Details

#expressionString

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.

Returns:

  • (String)

    A cluster query language expression to apply to the constraint.

#typeString

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.

Possible values:

  • distinctInstance
  • memberOf

Returns:

  • (String)

    The type of constraint.