[Libvir] [RFC]OpenVZ XML def
Daniel P. Berrange
berrange at redhat.com
Wed Mar 14 03:44:49 UTC 2007
On Wed, Mar 14, 2007 at 12:32:36AM +0530, Shuveb Hussain wrote:
> > - os: that's probably one place where OpenVZ may be quite different
> > from
> > Xen and QEmu, still what does the string
> > 'slackware-10.2-i386-minimal'
> > mean ? Is that a pointer to a file ? If yes shouldn't the associated
> > content be in the XML instead
> Under OpenVZ, there is no choice for the user as far as the OS is
> concerned. He has to live with Linux and Linux alone :-)
> So, in OpenVZ I think there is not need to specify '<os>' at all. When
> we are talking about a template, we are actually talking about what
> becomes the file system for the VM, so we should probably have
> something like this:
> Also, it is possible to specify VM level and VM user/grp level disk
> quotas for VMs in number of 1K blocks. These can also go under the
> 'disk' tag. But I think I will discuss this later.
> <quota level='vm'>102400</quota>
> <quote level='user' username='root'>102400</quota>
Looking at the kind of information you need to represent for a guest
filesystem I think we might be better off inventing a new tag here
instead of using <disk>. The <disk> tag is really about exposing
some file / device as a virtual disk to the guest OS. OpenVZ doesn't
have any formal concept of virtual disks - it is really a just dealing
in terms of a filesystem. Having the info under <disk> doesn't help
any applications like virt-install / virt-manager because the contents
of the <disk> element bears no resemblance to that used for Xen / QEMU.
So I think this is a really a fundamental modelling difference for VM
based virtualization, vs container based virtualization and thus we
should invent a new tag here.
I've not got a good name yet, so I'll just suggest:
<quote level='user' username='root'>102400</quota>
Other ideas instead of 'filesystem' could be 'image', 'root', or 'container'
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