Re: [Xen-devel] How to get the persistent identifier of a domain?

["Lily Huang" <ushuanglily@xxxxxxxxx>]

Thanks for kind help from your guys.

After I specified the uuid in the configuration file, I got stable uuid
across reboots. Now next question is:  how to get the uuid using
program instead of command line. I mean, in the kernel space. 

Thanks,
-lily

On 28 Dec 2006 17:29:54 +0000, M.A. Williamson <maw48@xxxxxxxxx> wrote:

>> Here is my experimental setting. I start a domu, run "xm list --long",
>> the uuid shown to me was (uuid 6cc8ab86-4ad4-7820-3326-53d666ff96aa).
>> Then, I shut down this domu, and start the same domu again. I got a
>> different uuid: (uuid 0c9ee2d6-4a9f-c0bf-989f-148bec284e15). You can see
>> these two uuids are different.
>>
>> I am using the latest xen-unstable.
>
>Do you mean that you've done xm create <file>, xm shutdown <domain>, and
>then xm create <file> again?  You are right, this will in effect create
>two separate VMs, with the same configuration, but different identities
>(and different UUIDs).

IIRC if you're using config files instead of the persistent VM support you
can also ensure a stable UUID by specifying it in the VM config file?

Cheers,
Mark

>If you use the new support for persistent VMs, then you should find
>that the VM retains its identity.  xm new <file>, xm start <domain>,
>xm shutdown <domain>, xm start <domain> should have the same effect as
>the commands above, but you will see that the VM retains its UUID.
>
>HTH,
>
>Ewan.
>
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