1. A method of providing policy-based operating system services in an operating system on a computing system, the computing system comprising at least one compute node, the compute node comprising an operating system, the operating system further comprising a kernel and a plurality of operating system services of a service type, the method comprising: establishing, on the compute node, a kernel policy specifying one of the operating system services of the service type for use in the operating system; and accessing, by the kernel, the specified operating system service.