A workloads management method for on-demand applications in distributed Network Functions Virtualization Infrastructure (dNFVI) includes receiving usage data from a unikernel implementing one or more functions of a plurality of functions related to a Virtual Network Function (VNF); determining an update to the one or more functions in the unikernel based on the usage data; updating the unikernel by requesting generation of application code for the unikernel based on the update; and starting the updated unikernel and redirecting service requests thereto. The unikernel and the updated unikernel are executed directly on a hypervisor