[Libvir] [RFC] Linux-VServer support

[Atsushi SAKAI]

Hi, Daniel 

Would you give me a pointer about discussion of OpenVZ (scheduler 
parameter config)?
I searched the ML archive but I cannot find the discussion.

Thanks
Atushi SAKAI


Daniel Veillard <veillard at redhat.com> wrote:

> On Thu, Nov 01, 2007 at 03:09:00AM +0100, Daniel Hokka Zakrisson wrote:
> > Daniel Veillard wrote:
> > >On Wed, Oct 31, 2007 at 02:39:05PM +0100, Daniel Hokka Zakrisson wrote:
> > >>Daniel Veillard wrote:
> > >>> I looked at the code, that seems clean but I have a concern about the
> > >>>overall XML format. Could you paste a couple of examples. Also I think
> > >>>Linux-VServer and OpenVZ kind of configuration may end up with the same
> > >>>kind of limitations or differences, so I would like to try to harmonize
> > >>>both format when possible.
> > >>Currently, the XML format is really limited. Are there any docs on what 
> > >>should be there, or should I just look at the other drivers? As far as 
> > >>harmonizing with the OpenVZ driver, I'm fine with that, but it seems to 
> > >>be pretty limited and, to some degree at least, ugly.
> > >
> > >  Harmonizing the XML formats shouldn't be that hard ...
> > >We discussed the OpenVZ format there
> > >  http://www.redhat.com/archives/libvir-list/2007-July/msg00347.html
> > >and around there earlier:
> > >  http://www.redhat.com/archives/libvir-list/2007-March/msg00193.html
> > >For network settings
> > >  http://www.redhat.com/archives/libvir-list/2007-July/msg00366.html
> > >
> > > <snip>
> > 
> > After looking at the various drivers, this is what I propose:
> > 
> > <domain type='vserver' id='2000'>
> >   <name>testvm</name>
> >   <memory>500000</memory>
> >   <scheduler fill_rate1='100' interval1='1000'>
> >     <cpu id='0' fill_rate1='0'/>
> >     <cpu id='1' fill_rate1='250' interval1='1000' idle_time='1' 
> > fill_rate2='250' interval2='1000'/>
> >   </scheduler>
> >   <container>
> >     <uts hostname='testvm' machine='i586'/>
> >     <distribution method='debootstrap' release='etch'/>
> >   </container>
> >   <devices>
> >     <disk type='path' device='path'>
> >       <source path='/vservers/testvm'/>
> >       <target path='/'/>
> >     </disk>
> >     <disk type='block' device='path'>
> >       <source dev='/dev/hda4'/>
> >       <target path='/var'/>
> >     </disk>
> >     <disk type='path' device='path'>
> >       <source path='/home/testvm'/>
> >       <target path='/home'/>
> >     </disk>
> >     <interface type='vserver'>
> >       <ip family='IPv4' address='1.2.3.4' prefix='24' interface='eth0'/>
> >     </interface>
> >     <interface type='vserver'>
> >       <ip family='IPv4' address='4.3.2.1' address2='4.3.2.200' 
> > prefix='24' type='range'/>
> >     </interface>
> >     <interface type='vserver'>
> >       <ip family='IPv6' address='dead:beef:dead:beef::1' prefix='64' 
> > interface='eth0'/>
> >     </interface>
> >   </devices>
> > </domain>
> 
>   That looks mostly fine to me except a few doubts about:
>      - <scheduler> this is tuning and we need a global discussion about this
>        we allowed something similar for OpenVZ but this need to be discussed
>        more globally.
>      - what are the ranges for the values of <container> elements and attributes
>        <uts> seems to be OS metadata, we already have an <os> element in
>        existing configs why not reuse that.
>      - some of the <ip> args are new, i.e. have no equivalent in existing 
>        config file uses:
>         + family: that looks okay to me, is that mandatory ? Could that
> 	  be guessed from one of the addresses given ?
> 	+ address2: what does that mean ? I understand one IP address being
> 	  served but since there is not really a notion of physical interface
> 	  why attach 2 address instead of defining 2 <interface> ?
> 	+ prefix: could you explain what this means ? if it's a netmask
> 	  let's use something like netmask="255.255.255.0" instead of 
> 	  prefix="24"
> 
> 
> > I realize this is not at all similar to what the OpenVZ driver does, but 
> > if necessary I could update that to use a similar scheme (though limited 
> > in testing).
> 
>   
> 
> -- 
> Red Hat Virtualization group http://redhat.com/virtualization/
> Daniel Veillard      | virtualization library  http://libvirt.org/
> veillard at redhat.com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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> 
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