family

The name of a family that this task definition is registered to. Up to 255 letters (uppercase and lowercase), numbers, hyphens, and underscores are allowed. A family groups multiple versions of a task definition. Amazon ECS gives the first task definition that you registered to a family a revision number of 1. Amazon ECS gives sequential revision numbers to each task definition that you add. To use revision numbers when you update a task definition, specify this property. If you don't specify a value, CFNlong generates a new task definition each time that you update it.