Re: [Libvir] [RFC]OpenVZ XML def
On Wed, Mar 14, 2007 at 12:32:36AM +0530, Shuveb Hussain wrote:
Hi,
> - 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:
<disk>
<template>fedora-core6-i386-minimal</template>
</disk>
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.
<disk>
<template>fedora-core6-i386-minimal</template>
<quota level='vm'>102400</quota>
<quote level='user' username='root'>102400</quota>
</disk>
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:
<filesystem>
<template>fedora-core6-i386-minimal</template>
<quota level='vm'>102400</quota>
<quote level='user' username='root'>102400</quota>
</filesystem>
Other ideas instead of 'filesystem' could be 'image', 'root', or
'container'
Dan.
--
|=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=|
|=- Perl modules: http://search.cpan.org/~danberr/ -=|
|=- Projects: http://freshmeat.net/~danielpb/ -=|
|=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=|