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You can list definitions and instances using layerform list definitions and layerform list instances, respectively. Listing definitions is useful usually after you have provisioned layers using layerform configure. By listing layers, you’ll be able to confirm that all of them have been provisioned correctly. Additionally, all developers that list definitions will understand which layers are available to them, and what are each layer’s dependencies. 
$ layerform list definitions

NAME          DEPENDENCIES
eks
elasticstack  eks
Listing layer instances is useful after spawning or killing a layer. By listing instances you’ll be able to see whether the spawn or kill commands worked, and what is the layer’s state. 
$ layerform list instances

INSTANCE NAME  LAYER NAME    DEPENDENCIES STATUS
default        eks                        alive
example        elasticstack  eks=default  alive