RE: [Xen-users] Xen3.2 documentation?

["Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx>]

Rudi Ahlers wrote:
> Ross S. W. Walker wrote:
> > Rudi Ahlers wrote:
> >> Todd Deshane wrote:
> >>> On Mon, Mar 31, 2008 at 2:58 AM, Rudi Ahlers wrote:
> >>>> Todd Deshane wrote:
> >>>>> On Fri, Mar 28, 2008 at 10:21 AM, Rudi Ahlers wrote:
> >>>>>> Hi
> >>>>>>
> >>>>>> Where can I get documentation for Xen3.2? I see the Xen site only has
> >>>>>> for Xen 3.0
> >>>>>>             
> >>>>> The user manual is named Xen 3.0, but it is generally up to date on
> >>>>> the latest stable version.
> >>>>>           
> >>>> That's a bit misleading, don't you think? 3.0, 3.1 & 3.2 AFAIK has a
> >>>> quite a few different features.
> >>>>         
> >>> Yeah I think that it can be a little confusing. I don't think that a 
> >>> lot changes from release to release except for new features usually
> >>>
> >>> Each new release has a detailed list of new features: 
> >>> http://xen.markmail.org/
> >>>
> >>> http://xen.markmail.org/search/?q=xen+3.0+announce#query:xen%2
> 03.0%20announce+page:1+mid:5t64trltkw2bce65+state:results
> >>>
> >>> http://xen.markmail.org/search/?q=xen+3.2+announce#query:xen%2
> 03.2%20announce+page:1+mid:6r2denuy6et7kluf+state:results
> >>>       
> >>>>> Are there specific things that you are looking for documentation on
> >>>>> that you don't feel are covered either in the manual or on the wiki?
> >>>>>           
> >>>> I want to see what is different, and the manual is / would be a good
> >>>> place to start. Unfortunately a lot of stuff on the wiki is outdated and
> >>>> doesn't even work "as-in" in Xen 3.1.
> >>>>         
> >>> There are probably some places where things should be clarified and 
> >>> worked on, but that is why it is a wiki right?
> >>>
> >>> We have a book that has been release on safari online and should be 
> >>> printing soon. We are also working on a companion website ( 
> >>> http://runningxen.com/ )
> >>>
> >>> Usually if you bring problems to this list, people can point you in 
> >>> the right direction as to where to look to find out the details.
> >>>
> >>> Do you have specific things you are looking for? Do you have a need to 
> >>> run any specific version(s)?
> >>>       
> >> Hi Todd
> >>
> >> Thank you for the detailed information. I need to / want to run a 
> >> CentOS5.1 x64 host, and then run 32bit Linux and FreeBSD, Windows guests 
> >> on it. I've followed / tried to follow the examples on the Wiki with 
> >> very little success, the only guest installation I've managed to get 
> >> working is CentOS 5.1 x64, the 32bit versions gave me some errors to 
> >> setup, so someone suggested I upgrade Xen to 3.2 (which I have no luck 
> >> with either) and use some of the pre-build images on jailtime.org.
> >>
> >> I realize 3.2 is very new / fresh, but I would really like to get this 
> >> kind of setup working
> >>     
> >
> > Maybe if you post your woes for the guests you are having problems
> > with on that guest's mailing list or here guest-by-guest.
> 
> I have done that :)
> 
> > The first time for each guest is non-trivial, the second and third
> > times is trivial.
> >
> > I find that if you have hardware virtualization available that it
> > is best to install fully virtualized, then afterwards download
> > the Xen PV kernel and work from that (making sure to change
> > storage device names to match). Also understand how the Xen config
> > files are setup (look in /etc/xen at the examples) and how to
> > extract the managed domains config using either 'xm list -l <domain>'
> > or 'virsh dumpxl <domain>'.
> 
> What do you mean by the PV kernel? Where do I get it? Do I simply 
> install it via rpm and then reboot?

Yes, most of the time just yum install it, set it as default in
grub, edit your fstab to use labels so file systems mount even if
the disk device names change (only necessary for disk partitions,
LVM logical volumes will be auto-recognized), then after modifying
the xen config to tell it to boot it paravirtualized it should
boot the PV kernel.

Of course if it's Debian based you would use apt-get and if it is
BSD based you would compile a new Xen domU kernel. Don't know how
to do it for OpenSolaris yet.

If you keep your domain images in LVM LVs you could try it out
first in a snapshot LV to make sure it works before doing it live.

-Ross

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