1. A method to provision workloads in cloud services implemented in virtual server racks, the method comprising: determining, via a first resource manager executing on a processor, parameters of a request for allocating resources of a virtual server rack for performing a workload; determining, via the first resource manager executing on the processor, logical computing resources to be utilized for performing the workload based on the parameters; determining, via the first resource manager executing on the processor, first physical computing resources installed in a first physical rack and second physical computing resources installed in a second physical rack included in the virtual server rack to perform the determined logical computing resources; instructing, via the first resource manager executing on the processor, a first centralized manager of virtual hosts to provision the first physical computing resources into the logical computing resources to allocate the logical computing resources for performing the workload; and instructing, via the first resource manager executing on the processor, a second resource manager associated with the second physical rack to instruct a second centralized manager of virtual hosts associated with the second physical rack to provision the second physical computing resources into the logical computing resources to allocate the logical computing resources for performing the workload.