A service is disclosed that allows configuration, management and deployment of instances. A configuration document can be stored by the service and one or more instance identifiers can be linked to the configuration document. As a result, multiple instances can be launched and configured using a single configuration document allowing for a consistent result across instances. Local agents running on the instances can execute plug-ins in order to effectuate the configuration. As a result, administrators of instances can configure, manage and easily deploy their unique instance configurations. Customers who manage their instances can scale and manage their entire fleet with repeatable configuration tasks that seamlessly integrate into their instance workflow.