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




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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