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

[Derek Glidden <dglidden@xxxxxxxxxxxxxxx>]

On Aug 10, 2004, at 6:29 PM, 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.
The bridge setup is just a function of the network script that xend 
calls when you start it.  You can easily change the network script to 
do "something else".  There's nothing inherent in the xen kernel or 
xend (AFAIK; I haven't had a lot of time to play with it for a couple 
of weeks) that requires you use bridging to do your network stuff, or 
that you do it specifically the way it comes out of the box.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
"I think that's what they mean by   |
"nickels a day can feed a child."   |       http://www.eff.org/
I thought, "How can food be so      | http://www.anti-dmca.org/
cheap over there?"  It's not, they  |--------------------------
just eat the nickels." -- Peter Nguyen


-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
"I think that's what they mean by   |
"nickels a day can feed a child."   |       http://www.eff.org/
I thought, "How can food be so      | http://www.anti-dmca.org/
cheap over there?"  It's not, they  |--------------------------
just eat the nickels." -- Peter Nguyen



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