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

  • To: mark.williamson@xxxxxxxxxxxx
  • From: "Lily Huang" <ushuanglily@xxxxxxxxx>
  • Date: Thu, 28 Dec 2006 14:19:18 -0500
  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ewan Mellor <ewan@xxxxxxxxxxxxx>
  • Delivery-date: Thu, 28 Dec 2006 11:19:00 -0800
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

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.


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?


>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.
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