Re: Re: PXE boot

[Mike Brady <mike.brady@devnull.net.nz>]

I haven't got to it yet, but I was hoping ot use SISuite and/or xCAT to build 
domains somehow.

On Thu, 29 Jul 2004 19:32, Ian Pratt wrote:
> > Hi there,
> >
> > > Xen currently doesn't support booting domains via PXE, though at
> > > some point someone talked about adding it. Basically, the domain
> > > builder would do the PXE request and tftp the kernel image that
> > > would be place in the domain.
> > >
> > > I'm sure you could get the domains booting sans PXE without too
> > > much hassle anyhow.
> >
> > I would assume that it would probably be sufficient to modify the
> > domain builder in a way that, upon request, it executes a script
> > (kind of like a constructor) before the domain starts up. One could do
> > things like setting up a disk image with all needed data (like the kernel
> > image) in that. As everything is physically handled in domain0, this
> > could easily replace  the PXE  boot. And one could of course do many
> > other cool things in such a constructor (and destructor type) script. Or
> > maybe I'm wrong.
>
> The domain's kernel image is placed in memory by the domain
> builder, so doesn't need to come off the domain's virtual disk.
>
> PXE is basically a combination of DHCP and tftp.
>
> We could have the domain builder issue a DHCP request using the
> domain it's building's MAC address, then use tftp to fetch the
> kernel image into a temporary file that the domain builder can
> then use.
>
> Adding support to xend to do this shouldn't be hard. The only
> slightly non trivial bit is sending a DHCP request using someone
> else's MAC -- rather than hacking dhclient it's probably easiest
> to hand craft something one-shot as you don't need a daemon
> (presumably you can rely on the server giving the same address to
> the same MAC if asked in quick succession)
>
> Ian
>
>
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