How to boot the system from an ISO located on the HDD?

Question

ISO

Comrades, help solve the puzzle.
Given: a clean hard drive, an iso image of a pxe bootloader.
It is necessary: ​​to be able to boot the system from an iso-image, which will unfold into a pxe-loader directly into the RAM and pull up the thin client config over the network.
Constipation turned out at the stage of loading iso from the hard drive. It feels like no one can do it properly. It is necessary that all operations take place precisely in the operative, so that in the event of a computer shutdown, only what was originally uploaded there is left on the hdd. Is it generally solvable?

Answer 1

grub can load isos.