Re: [Xen-users] xen hotplug scripts not working

[Tim Post <tim.post@xxxxxxxxxxxxxxx>]

On Fri, 2007-03-16 at 03:21 +0800, Tim Post wrote:

Sorry, forgot to show you the alternate config :

> On Thu, 2007-03-15 at 20:06 +0100, Christian Placzek wrote:
> 
> > auto eth1
becomes auto xen-br1
> > allow-hotplug eth1
you can add allow-hotplug xen-br1 but should not be needed
> > iface eth1 inet static
iface xen-br1 inet static
> >        address 10.1.1.201
> >        netmask 255.255.255.0
> >        network 1.1.1.0
#then add:
           bridge_fd 0
           bridge_maxwait 0
           bridge_helo 0
           bridge_stp off
           bridge_ports eth1

Just tell the bridge what eth device to port, or 'none' if you want to
setup a dummy bridge to serve as a switch for some guests. You need to
give it an IP even if its a dummy (.1 in any reserved address is fine),
just no gatway.

Contradictory, every bridge that lets guests talk to the internet will
need a gateway, or it will only let guests talk to the same network as
the bridge. Tempting as it may seem, leave stp off, you don't wanna go
there.

Remember that when you re-start networking, you'll need to re-attach the
vif's to their respective bridges. you can see scripts/vif-* for how to
manage this within your own scripts. 

Another way to do it is with a vif-detach / attach, but I haven't played
with that way yet.

Best, and sorry for the double post. I forgot to paste my version
instead of the quoted one.

--Tim

> 
> Stop using network-bridge , its there to construct and deconstruct a
> bridge so that Xen itself is non destructive (no changing of network
> init needed to install it).
> 
> Since you are doing the more production-sensible thing by letting Debian
> handle your bridges in init, there's no need to be using network-bridge.
> Better, more structured and sensible control over all of that is partly
> achieved by how you construct your guests.
> 
> First thing to do, get rid of network-bridge
> 
> In /etc/xen/scripts/ do 
> 
> echo -e "#!/bin/sh\nexit 0" > network-dummy && chmod +x network-dummy
> 
> Then in /etc/xen/ change xend-config.sxp to call network-dummy instead
> of network-bridge.
> 
> Secondly (just suggesting) : 
> 
> Specify vifname= in the vif [] containers in the guests to keep it all
> nice and neat. If you name the vif after the domname (or something else
> specific and meaningful), bandwidth accounting becomes *very* easy over
> an entire farm, which sounds like it would also lend well to your setup.
> 
> Best,
> --Tim
> 
> 
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