On Fri, Dec 3, 2010 at 3:27 AM, Alan Pevec <apevec@gmail.com> wrote:

On Thu, Dec 2, 2010 at 10:52 PM, mammar <mammar@gmail.com> wrote:
> As far as i know, when a client boots over network using pxe, to boot linux
> it just need the following two files extracted from the iso image
>
> vmlinuz: compressed Linux kernel executable
> initrd (initail RAM disk): initial root file system

you still need rootfs somewhere

> It doesn't need the ISO.
>
> I think label Fedora-13-live.iso is used by dracut during mount the rootfs.

that's not the label, it's pointing to the actual ISO file included in
the initrd by -to-pxeboot script
which is unpacked into initramfs

> It would be great if someone can describe in detail the purpose of
> root=live:/ISOLABEL and why only correct iso image label work.

http://dracut.git.sourceforge.net/git/gitweb.cgi?p=dracut/dracut;a=blob;f=modules.d/90dmsquash-live/parse-dmsquash-live.sh;h=38610fb11ce4839d7328d56c20b752f4d9f492f2;hb=HEAD

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