1. A method of operating a computing system, the method comprising: mounting a disk image corresponding to a production managed machine on a service managed machine in response to a command from a maintenance scheduler, wherein the production managed machine performs operations to provide a computing service for a user, and wherein the service managed machine performs maintenance operations distinct from the operations performed by the production managed machine in providing the computing service; scanning the disk image at the service managed machine to determine a corrective action to be performed with respect to the disk image, wherein the corrective action comprises one of the maintenance operations; and initiating performance of the corrective action for the disk image of the production managed machine at the service managed machine, wherein initiating performance comprises: when the production managed machine is in an online state, transmitting data specifying the corrective action that was determined at the service managed machine to a service agent installed on the production managed machine for performance thereby; and when the production managed machine is not in the online state, performing the corrective action for the disk image at the service managed machine to provide a maintained disk image for subsequent use by the production managed machine.