For RHEL 10.2, we want to document the stateless pxe support.

The README included with the image is pretty good and explain somewhat how to use it:

1. About this archive

This archive contains files suitable for use with PXE booting or UEFI HTTP booting.
It includes this following:

• EFI/ directory tree of shim and Grub2 bootloader files
• vmlinuz - kernel
• initrd.img - initial ramdisk
• rootfs.img - compressed root filesystem
• grub.cfg - a grub2 template

Make sure that the system has enough RAM to hold the kernel, initrd, and rootfs
in memory. This size will depend on how large your rootfs.img is and what kinds
of workloads you are running. 2GiB is usually enough for a small image. If there isn't
enough RAM to boot you will likely see a kernel panic.

1. PXE booting with a HTTP server

The grub.cfg file is a template that will need to be modified for your specific situation.
It expects the kernel, initrd, and rootfs to be placed at the / of the tftp server's
directory tree.

The first entry uses http to serve the rootfs.img you will need to replace
'HTTP-SERVER' with the url of a http server. For experimentation you can launch
a simple server using python like this:

    python3 -m http.server 8000

Run that from the directory with the rootfs.img file.

1. PXE booting with combined image

The second entry is for use with a combined initrd and rootfs image. This saves you the
step of setting up a HTTP server but requires that you assemble the combined image from
the initrd and the root filesystem.

1. 1. Create a combined image

    echo rootfs.img | cpio -c --quiet -L -o > rootfs.cpio
    cat initrd.img rootfs.cpio > combined.img