Amazon ECS Clusters
An Amazon EC2 Container Service (Amazon ECS) cluster is a logical grouping of container instances that you can place tasks on. When you first use the Amazon ECS service, a default cluster is created for you, but you can create multiple clusters in an account to keep your resources separate.
Clusters can contain multiple different container instance types.
Clusters are region-specific.
Container instances can only be a part of one cluster at a time.