1. A method for discovery of a root file system, comprising: obtaining a tag corresponding to a boot image for an operating system; identifying, by a boot loader, a location of the boot image having a predefined value matching the tag; loading a kernel of the operating system retrieved from the boot image; transferring execution to the kernel, wherein the boot loader provides the tag for the location to the kernel; identifying, by the kernel, the location of the root file system based on the tag provided by the boot loader; and executing the operating system on a processor using the root file system identified by the kernel.