Re: [Xen-users] Why creating DomU failed (seems it is due to LVM)

[Steven Dugway <steven@xxxxxxxxxxxxxxxxxxx>]

TMC wrote:
> On 11/12/06, Steven Dugway <steven@xxxxxxxxxxxxxxxxxxx> wrote:
> > TMC wrote:
> > > can you please post your config here?
> > >
> > > I suspect that your trying to start LVM configuration from Dom0 in
> > > DomU...
> > >
> > > There are two ways to do things.
> > >
> > > a) put all disk in Dom0 under LVM and manage disk for all DomU
> > > instances that way..
> > That is how I do it and then export the partitions for each domU, works
> > fine with old FC5 packages.
> > Here is an config file:
> >
> > kernel = "/boot/vmlinuz-2.6.18-1.2849.fc6xen"
> > #kernel = "/boot/2.6.16-1.2122_FC5xenU"
> > memory = 250
> > name = "spooner"
> > ramdisk = "/boot/initrd-2.6.18-1.2849.fc6xen.img"
> > vif = [ '' ]
> > disk=['phy:/dev/VolGroup00/spooner,sda1,w','phy:/dev/VolGroup00/spoonerHS,sda4,w','phy:/dev/VolGroup00/swap1,sda2,w','file:/img/tmpfiles,sda3,w'] 
> >
> > root = "/dev/sda1 ro"
> Ok.
>
> What I suspect is happening is that you have  copied a whole parent
> server instance (with a running /etc and such like) instead of doing a
> clean install to your patritions with kickstart, jump-start or
> debootstrap.
This is not working.

There is some mystery about the initrd setup.
I did everything I could test on my own and from suggestions on this 
list, in vain.
It is hard to make timely decisions with the current state of affairs 
with Xen. I spent 4 months since the first broken package in FC5 in 
september to try to get my Centos domU running and nothing works, which 
means I am stuck with old version of Xen. I had hope the FC6 version 
would fix it but no. The centos no better. Does anybody know a GNU linux 
distro that is serious about supporting Xen?
I did figure out the howtos of mkinird and the ramdisk concepts, the 
problem is I do not know what to put/modify inside to make it work.
This is very frustrating.

Thanks anyway.

> This means that your LVM subsystem is looking in /etc, finds configs
> and goesa looking for disks to  manage and fails, bacuse it must. you
> are accessing abstracted devices not raw devices in your DomU.
>
> I think you need to blow away (or at least rename) all LVM configs in
> /etc/ of  your DomU. They are not needed.
>
> Also you need to change:
> your networking (unless you DHCP)
> hostname
> edit the fstab to refer to /dev/sda1, /dev/sda2, /dev/sda3 and
> /dev/sda4  as required instead of  lables or /dev/VolGroup** stuff.
>
> Also Please boot the XenU specific kernel, if your packages provide
> it. Its safer.
>
>
> Hope this helps
>
> Tomasz
--

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