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[Xen-users] xenstore /vm/$uuid cleared on domU reboot - bug or feature

  • To: xen-users@xxxxxxxxxxxxx
  • From: Jacek Konieczny <jajcus@xxxxxxxxxx>
  • Date: Thu, 24 Apr 2014 14:20:01 +0200
  • Delivery-date: Thu, 24 Apr 2014 12:21:34 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>


I need to provide some data to my domUs from dom0. I decided to use
xenstore for that and I put my data under /vm/$uuid/ – I assumed that
is a good place, as the domU can easily locate this data and it is said
to 'not change even on migration'.

The http://wiki.xen.org/wiki/XenStore_Reference states:

> The /vm path stores configuration information for a domain. This
> information doesn't change and is indexed by the domain's UUID.

Unfortunately, I found this not being true. The information does change,
on a domU restart. The path is the same (provided I use static UUID in
the xl cfg file), but all old contents is gone.

Is that expected?

Should I use some other location in the xenstore for my data? What is
are the 'best practices' here?

Using own 'root' namespace for my per-domU data would have some
inconvenieces, like that I will need to remove it when the VM is
_finally_ gone.


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