Re: [Xen-users] 4.0.1, Debian Squeeze, and p[yv]grub

[Jan Bakuwel <jan.bakuwel@xxxxxxxxx>]

Hi Simon,

Debian with Xen 4.0.1 and pygrub works just fine if you take care of the
following:

ln -s /usr/lib/xen-4.0/bin/pygrub /usr/bin/pygrub
ln -s /usr/lib/xen-4.0 /usr/lib/xen

make sure your domU root fs is the first disc in your list of virtual discs
make sure your domU root fs is ext3 or ext4 (I can confirm that ext3
works - haven't tried ext4)

Good luck,
Jan


On 28/05/11 03:25, Simon Hobson wrote:
> The system is a new install of Debian Squeeze, with Xen 4.0.1 (latest
> stable package for Debian). I'm trying to get guests booted with
> pygrub, or even better pvgrub but it's not working for me.
>
> First off, as far as I can tell, pvgrub isn't in Debian - and it won't
> be as it's been rejected. Does anyone know if this is being worked on ?
>
> As for pygrub, that's failing as well. Apart from hitting the known
> bug that stops GRUB2 from installing on the guest (had to pull a later
> version down from Testing), starting a domain gives the error :
>
>>    Error: Boot loader didn't return any data!
>
> /var/log/xen/xend.log contains :
>
>> Traceback (most recent call last):
>>   File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
>> 104, in create
>>     vm.start()
>>   File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
>> 469, in start
>>     XendTask.log_progress(31, 60, self._initDomain)
>>   File "/usr/lib/xen-4.0/lib/python/xen/xend/XendTask.py", line 209,
>> in log_progress
>>     retval = func(*args, **kwds)
>>   File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
>> 2820, in _initDomain
>>     self._configureBootloader()
>>   File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
>> 3266, in _configureBootloader
>>     bootloader_args, kernel, ramdisk, args)
>>   File "/usr/lib/xen-4.0/lib/python/xen/xend/XendBootloader.py", line
>> 215, in bootloader
>>     raise VmError, msg
>> VmError: Boot loader didn't return any data!
>
>
> Following a hint I came across, I tried manually calling pygrub with :
>>  /usr/lib/xen-default/bin/pygrub --args="root=/dev/xvda1 ro"
>> /dev/vgmain/ipv6root
>
> And got these errors :
>
>> Using <class 'grub.GrubConf.Grub2ConfigFile'> to parse
>> /boot/grub/grub.cfg
>> WARNING:root:Unknown directive load_video
>> WARNING:root:Unknown directive terminal_output
>> Traceback (most recent call last):
>>   File "/usr/lib/xen-default/bin/pygrub", line 669, in <module>
>>     chosencfg = run_grub(file, entry, fs, incfg["args"])
>>   File "/usr/lib/xen-default/bin/pygrub", line 549, in run_grub
>>     g = Grub(file, fs)
>>   File "/usr/lib/xen-default/bin/pygrub", line 205, in __init__
>>     self.read_config(file, fs)
>>   File "/usr/lib/xen-default/bin/pygrub", line 413, in read_config
>>     self.cf.parse(buf)
>>   File "/usr/lib/xen-4.0/bin/../lib/python/grub/GrubConf.py", line
>> 402, in parse
>>     self.add_image(Grub2Image(title, img))
>>   File "/usr/lib/xen-4.0/bin/../lib/python/grub/GrubConf.py", line
>> 318, in __init__
>>     _GrubImage.__init__(self, title, lines)
>>   File "/usr/lib/xen-4.0/bin/../lib/python/grub/GrubConf.py", line
>> 87, in __init__
>>     self.reset(lines)
>>   File "/usr/lib/xen-4.0/bin/../lib/python/grub/GrubConf.py", line
>> 103, in reset
>>     self._parse(lines)
>>   File "/usr/lib/xen-4.0/bin/../lib/python/grub/GrubConf.py", line
>> 98, in _parse
>>     map(self.set_from_line, lines)
>>   File "/usr/lib/xen-4.0/bin/../lib/python/grub/GrubConf.py", line
>> 328, in set_from_line
>>     setattr(self, self.commands[com], arg.strip())
>>   File "/usr/lib/xen-4.0/bin/../lib/python/grub/GrubConf.py", line
>> 106, in set_root
>>     self._root = GrubDiskPart(val)
>>   File "/usr/lib/xen-4.0/bin/../lib/python/grub/GrubConf.py", line
>> 57, in __init__
>>     self.disk = str
>>   File "/usr/lib/xen-4.0/bin/../lib/python/grub/GrubConf.py", line
>> 70, in set_disk
>>     self._disk = int(val[2:])
>> ValueError: invalid literal for int() with base 10: 'ev/xvda1'
>
>
> Based on the last line of that, I tried an experiment and edited the
> script. AFAICS, the line in question is trying to extract a number
> from a device name, so I tried changing it from
>> self._disk = int(val[2:])
> to
>> self._disk = int(val[9:])
>
> I can then get the GRUB menu, and then quits - putting :
>> linux (kernel /var/run/xend/boot/boot_kernel._IqLoQ)(ramdisk
>> /var/run/xend/boot/boot_ramdisk.XUIE7W)(args
>> "root=UUID=0fdd2127-ff17-4bd4-b1b8-08fd8b27ec9a ro  quiet
>> root=/dev/xvda1 ro")
> to the terminal - but not starting the guest.
>
> Trying to start the guest with "xm create -c ipv6" gives :
>
>> Started domain ipv6 (id=3)
>>                           [    0.204334] PCI: Fatal: No config space
>> access function found
>> [    0.251557] i8042.c: No controller found.
>> Loading, please wait...
>> mount: No such device
>> W: devtmpfs not available, falling back to tmpfs for /dev
>> Gave up waiting for root device.  Common problems:
>>  - Boot args (cat /proc/cmdline)
>>    - Check rootdelay= (did the system wait long enough?)
>>    - Check root= (did the system wait for the right device?)
>>  - Missing modules (cat /proc/modules; ls /dev)
>> ALERT!  /dev/xvda1 does not exist.  Dropping to a shell!
>> (initramfs)
>
> So it seems to have started the guest, but not with the right setup.
>
> If I change the boot settings back to using kernel= and ramdisk= gives
> me a working guest again.
>
> Any hints ?
>
> Bear in mind that I'm trying to keep it entirely with packaged
> software, and 4.1 is only in the Debian unstable repository at the
> moment.
>


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