Re: [Xen-devel] xen 2.0, networking, bridging, and nfsroot

[Brian Wolfe <brianw@xxxxxxxxxxxx>]

Hmm, that is a good idea. I have been pursuing the idea of a stripped
down linux OS just for running as the Domain0. I'll be taking the base
from the Debian install CD and adding the necessary libraries and
whatnot that Domain0 requires to perform it's duties as the privileged
domain. I have a partially working stripped down copy of the standard
Debian unstable base install on a test server. Still needs work to
reduce it further so that it will fit into a small initrd.

 The end goal is to have Domain0 not need ANY network or physical disk
access. The config files for xen domains would be pulled either from a
http based config server, or loaded from a temporarily mounted source at
boot time, or pre-exist int he initrd image.

Don't expect an image for several weeks. 8-P I've got my hands full
already getting the latest Xen packaged for Debian unstable and iSCSI
packaged since I could not find any packages pre-made.

The good news is that I have a working debian/rules file for compiling
all of the targets and the start of .config files for 2.6.7 priv and
unpriv. I'll probably toss up some very broken .deb files Wednesday
night (CST). I'm certain that Adam will find PLENTY of packaging flaws
for me to fix up. :) I'va mangled his build scripts quite well by now.
*grin*

On Tue, 2004-08-10 at 22:05, Sachin Goyal wrote:
> I have never tried pxeboot or diskless linux, but I guess you can include
> bridge tools (e.g brctl) in initrd image and configure the network card 
> initially
> itself in bridge mode before nfs mounting the real root.
> 
> sachin
> 
> 
> On Tue, 10 Aug 2004, Adam Heath wrote:
> 
> > Our current setup(based on 1.0 and 1.2) uses completely diskless machines.
> > They pxeboot, which then runs grub, which then loads xen.  dom0 and domN all
> > do nfsroot, and everything is happy.
> >
> > So, along comes 2.0.  It now uses a normal bridge to connect dom0 and domN.
> > However, the bridge has a hole, where the network does not exist, while it
> > copies the addresses from eth0 to br0, and changes all the routes.
> >
> > In nfsroot mode, this fails, as suddenly the network is inaccessible, so
> > brctl(and friends) can no longer be found.
> >
> > It would be more safe, to not use a bridge to configure access to the other
> > domains; this would leave networking running at all times on dom0. 
> > Otherwise,
> > if the bridge setup code breaks, you would end up with dom0 not accessible
> > from the net, even in normal disk-bound situations.
> >
> >
> >
> >
> >
> >
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