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Re: [Xen-devel] Re: [Xen-users] creating a domU with a particular UUID with xen-unstable
- To: "Andrew D. Ball" <aball@xxxxxxxxxx>
- From: Kip Macy <kip.macy@xxxxxxxxx>
- Date: Tue, 1 Nov 2005 10:40:11 -0800
- Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 01 Nov 2005 18:37:16 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
It would seem to me that if you either seeded the UUID from the initial
physical machine's MAC address (assuming that one can do that) or
if you concatenated a MAC address from the physical machine
with a 64-bit time value that your odds of collision would be
On 10/31/05, Andrew D. Ball <aball@xxxxxxxxxx> wrote:
It looks like I can do this by starting a domain from an SXP directly
instead of a Python-based configuration.
If I use a suitable algorithm for generating UUIDs, I should be able to
guarantee at least an extremely low probability of UUID collisions
across an entire farm of systems running Xen. I will read up some more
on the ISO UUID algorithm commonly used by hardware manufacturers. I
don't trust it quite yet, but it does seem that this is in line with its
I'm not really fond of the behavior of domain name collisions. I don't
want to have to query some sort of farm-wide database to see if a domain
name isn't being used to guarantee uniqueness, but I want to be able to
guarantee that I'll never have a domain name collision when doing a live
migration of a domU to another system. They are nice to have around for
being easily readable by humans though.
Thanks for your help.
Anthony Liguori wrote:
> Andrew D. Ball wrote:
>> Is it possible with xen-unstable (hopefully soon to be Xen 3.0) to
>> create a domU with a particular UUID? I don't want the UUID for a
>> domain to change when I destroy it and create it again from the same
> You could always make the domain's name it's UUID.
> Anthony Liguori
>> This doesn't necessarily have to have anything to do with xenstore's
>> being persistent, it could just involve a configuration option similar
>> to the one for virtual NICs where MAC addresses can be assigned
>> explicitly if desired but will be pseudo-randomly generated otherwise.
>> Thanks for your help.
>> Xen-users mailing list
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