Re: [Xen-users] Xen virtual interface settings

["Grant McWilliams" <grantmasterflash@xxxxxxxxx>]

On Sat, Jan 3, 2009 at 12:52 PM, Todd Deshane <deshantm@xxxxxxxxx> wrote:

On Thu, Dec 11, 2008 at 3:36 PM, Grant McWilliams
<grantmasterflash@xxxxxxxxx> wrote:
> I've been mucking with xen for quite a while but recently started focusing
> on custom network setups. I'd like to be able to create VMs on the fly from
> a base image and set network settings in each without booting the image up.
>
> This strange setup is for a classroom environment. At the beginning of the
> quarter the instructor would run a script that creates all the student's
> DomUs and assigns a route to them on the Dom0 from the WAN . The goal is to
> have a remote port (say 10001) be redirected to the students virtual
> machine's port 22. Each student would access their VM using a different
> remote port. All of the students VMs will be copies (or using qcow2 backing
> file) of  a base image so will be identical to save space and setup time.
>
> It seems like I had it easy by setting vif = [ 'ip=x.x.x.x' ] but this
> doesn't seem to do anything. According to Running Xen you need to statically
> set the ip inside the DomU as well as setting it in the domU config file.
> Doesn't setting it in both places defeat the purpose of having it in the
> DomU config file to start with?
>

An update on the website about this:
http://runningxen.com/changes/

"The kernel has to be compiled with CONFIG_IP_PNP to enable the
automatic network settings.

Then IP, Netmask, Gateway, … will set from config-file (as long, there
is no extra setting in domU's /etc/network/interfaces for eth0)

grep IP_PNP /boot/config-2.6.-xen" shows you if it is set." - xen mailing list


Related (old) bug report:
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=471

I haven't test it yet, but it is worth looking into.

Hope that helps.

Cheers,
Todd

Thanks a million, I'm checking into it. This is definately not turned on in CentOS-xen kernels. Looks like a kernel compile is in the order. Maybe the CentOS/Redhat guys need to turn it on in the compile.


Grant McWilliams

Some people, when confronted with a problem, think "I know, I'll use Windows."
Now they have two problems.

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