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

["Zhang Binbin" <binbinzh@xxxxxxx>]

Thanks for your suggestion!

I checked init in initrd for DomU, and modified
        mount -o defaults --ro -t ext3 /dev/root /sysroot
to 
        mount -o defaults --ro -t ext3 /dev/sda1 /sysroot 
/dev/sda1 is DomU root device.
Then DomU can boot successfully!

Waiting for your details :-)

Thanks again!

======= 2006-12-13 08:17:37 you wrote:=======

>Zhang Binbin wrote:
>> I moved a little :-)
>> Something does be wrong with initrd.
>> I make a new initrd according to DomU's fstab:
>>      # mount /dev/GuestVG/DOM1 /mnt
>>      # mkinitrd --fstab=/mnt/etc/fstab /boot/initrd.2.6.16.29-xenU.img 
>> 2.6.16.29-xen
>>      # umount /mnt
>> then create Dom1
>> there is no more LVM info.
>> but it still failed to mount /root. I'm working to find out why...
>>   
>Hi,
>
>I am making progress, I will publish the results soon, takes roughly an
>hour for each compile, already made a few today.
>The tricky part is figuring out the ramdisk.
>
>I found this document helpful for initrd understanding and creation:
>
>http://www-128.ibm.com/developerworks/linux/library/l-initrd.html
>
>++
>> ======= 2006-12-12 05:20:33 you wrote:=======
>>
>>   
>>> 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
>>>>
>>>>       
>>> -- 
>>>
>>> _______________________________________________
>>> Xen-users mailing list
>>> Xen-users@xxxxxxxxxxxxxxxxxxx
>>> http://lists.xensource.com/xen-users
>>>     
>>
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>>
>>
>>   
>
>
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