Hi@akhtar,
You can create a task set in the specified cluster and service. This is used when a service uses the EXTERNAL deployment controller type. The following create-task-set example creates a task set in a service that uses an external deployment controller.
$ aws ecs create-task-set \
--cluster MyCluster \
--service MyService \
--task-definition MyTaskDefinition:2 \
--network-configuration "awsvpcConfiguration={subnets=[subnet-12344321],securityGroups=[sg-12344321]}"