Re: [Xen-users] Re: Xen 4.0 on gentoo hotplug scripts problem?

[Andrew Lyon <andrew.lyon@xxxxxxxxx>]

On Fri, Apr 9, 2010 at 9:21 AM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
> On Fri, Apr 9, 2010 at 9:15 AM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
>> On Fri, Apr 9, 2010 at 9:10 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
>>> On Fri, Apr 09, 2010 at 08:45:44AM +0100, Andrew Lyon wrote:
>>>> On Thu, Apr 8, 2010 at 10:20 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
>>>> > On Thu, Apr 08, 2010 at 02:14:17PM -0700, Boris Derzhavets wrote:
>>>> >>    I believe profile should look like
>>>> >>
>>>> >>    memory=512
>>>> >>    name='Gentoo-32-test'
>>>> >>    vif=['bridge=eth(x)']
>>>> >>    bootloader='/usr/bin/pygrub'
>>>> >>    disk=['file:/mnt/tb1_store/Xen
>>>> >>    VMs/Gentoo-32/Gentoo-32.sda1,xvda,w','phy:/dev/test/test,xvdb ,w']
>>>> >>    extra='gentoo=nodevfs console=xvc0'
>>>> >>
>>>> >>    It's PV domU , so xvda,xvda,.....
>>>> >>
>>>> >>    Blktap driver is not important, no "tap:aio"
>>>> >>
>>>> >
>>>> > Also I think Xen 4.0.0 needs to have "disk = [ 
>>>> > "tap:tapdisk:aio:/path/images/disk.img,xvda,w" ]" to use blktap2.
>>>>
>>>> I tried that syntax but it does not work:
>>>>
>>>> name='Gentoo-32-test'
>>>> vif=['bridge=eth0']
>>>> bootloader='/usr/bin/pygrub'
>>>> disk=[ "tap:tapdisk:aio:/mnt/tb1_store/Xen 
>>>> VMs/Gentoo-32/Gentoo-32.sda1,xvda,w"]
>>>> extra='gentoo=nodevfs console=xvc0'
>>>>
>>>> Using config file "./Gentoo-32-test.cfg".
>>>> Error: [Errno 2] No such file or directory: 'aio:/mnt/tb1_store/Xen
>>>> VMs/Gentoo-32/Gentoo-32.sda1'
>>>>
>>>
>>> Hmm.. that's weird. The blktap2 syntax is correct based on the latest 
>>> blktap2 README here:
>>> http://lxr.xensource.com/lxr/source/tools/blktap2/README
>>>
>>>> I changed the config back to file:/ and tried again, the xm create
>>>> process seemed to hang and the block script was stuck:
>>>>
>>>
>>> Ok, so you have some general problem, not really blktap2 related..
>>>
>>>>
>>>> root     14152  0.0  0.0  17596  1572 ?        S<   08:43   0:00
>>>> /bin/bash /etc/xen/scripts/block add
>>>>
>>>> eventually it errors  Error: Device 51712 (vbd) could not be
>>>> connected. /etc/xen/scripts/block failed; error detected.
>>>>
>>>> And the remove script is also stuck:
>>>>
>>>> /bin/bash /etc/xen/scripts/block remove
>>>>
>>>
>>> Did you install Xen 4.0.0 over some old version?
>>>
>>> Did you remove the old version first? Maybe your 4.0.0 is not 
>>> completely/properly installed..
>>
>> I will try removing Xen first, including all of /etc/xen/
>>
>> Andy
>>
>>>
>>> Pasi
>>>
>>>
>>
>
> I think you are onto something, after completely removing Xen I cannot
> compile 4.0:
>
> Wl,-O1          -L../../tools/libxc -lxenctrl    -L../../tools/libxc
> -lxenctrl          -o libvhd.so.1.0.0 -luuid libvhd.o libvhd-journal.o
> vhd-util-coalesce.o vhd-util-create.o vhd-util-fill.o
> vhd-util-modify.o vhd-util-query.o vhd-util-read.o vhd-util-repair.o
> vhd-util-resize.o vhd-util-revert.o vhd-util-set-field.o
> vhd-util-snapshot.o vhd-util-scan.o vhd-util-check.o relative-path.o
> atomicio.o ../../lvm/lvm-util.o
> /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.4/../../../../x86_64-pc-linux-gnu/bin/ld:
> cannot find -lxenctrl
> collect2: ld returned 1 exit status
> make[6]: *** [libvhd.a] Error 1
> make[6]: Leaving directory
> `/var/tmp/portage/app-emulation/xen-tools-4.0.0/work/xen-4.0.0/tools/blktap2/vhd/lib'
> make[5]: *** [subdir-all-lib] Error 2
>
> Which makes me think that some part of 4.0 was compiled against 3.4.2...
>
> Andy
>

I've found at least one problem with 4.0, if the path to the disk
backing file contains any spaces then the hotplug scripts stall and
domain creation fails, I had made a symlink without spaces but
apparently the scripts attempt to resolve symlinks so I had to
physically rename the dir so that no spaces are used.

I struggled to find any errors relating to domain creation, but the
hotplug cleanup scripts do log some errors:

/etc/xen/scripts/xen-hotplug-cleanup: line 25: [: !=: unary operator expected
stat: cannot stat `/mnt/tb1_store/Xen': No such file or directory
stat: cannot stat `VMs/WinXP/WinXP.hda': No such file or directory
xenstore-read: couldn't read path backend/vbd/7/768/node

The path was "/mnt/tb1_store/Xen VMs/WinXP/WinXP.hda" and worked fine with 3.4.2

andy

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