Re: [Xen-users] Xen installation : Python C API mismatch

["Antoine Benkemoun" <antoine.benkemoun@xxxxxxxxx>]

Thank you for your thorough answer !

Indeed I am booting Debian with the Xen kernel perfectly. I don't know what you mean by XenLinux but I'm guessing it's what I am booting or something similar enough.

I agree that since it is the same version it shouldn't mess things up too much. I am compiling at the moment using the same tutorial (it had a compiling source page included). It's taking for ever even with a Quad Core Xen machine with 4GB of RAM...

I'll keep you updated if this works or if I get a free trip to the datacentre :P

Antoine

On Thu, Jul 17, 2008 at 9:43 PM, Mark Williamson <mark.williamson@xxxxxxxxxxxx> wrote:

> Thank you for your quick answer.
>
> I installed the 3.1.0 binaries on a Lenny Sid installed. I followed the
> "Perfect Xen 3.0 install" tutorial to the letter.
>
> I have the possibility to install from sources but I am somewhat afraid to
> do so... Can it crash the machine if installed ontop a previous install ?
> Basically, the machine not rebooting correctly wins me a trip to the
> datacentre and that's not fun :P

Xen doesn't play very well with conflicting installs.  I guess if you're
installing the same version from source that you've just installed in
binaries it's not so likely to screw things up.  That said, most of the
conflicts are typically in userspace stuff, which shouldn't stop the machine
actually booting.  I'd also not expect such conflicts to result in a crash at
runtime, it just usually means Xend doesn't work properly.

> Is it possible to uninstall a previous Xen install so it doesn't mess up
> everything ?

Yes, if you can figure out which bits to remove.  I think there's a "make
uninstall" target in the source distribution that should do this reasonably
thoroughly for you; it's not included in the binary distribution you
currently have :-(

*however* in your case, you have successfully installed Xen and XenLinux by
the sound of it and they're already booting - am I reading you right?

If you get the source distribution for the same version of Xen and then just
compile / install the userspace tools, that should do.  You probably don't
really need to build Xen / XenLinux lot again, or even reboot for that
matter.

You might still need to remove the old userspace libraries to make Xend work
right.  make uninstall should take them away but it might remove your Xen /
XenLinux too...  I'd suggest you manually look at what the Makefile does to
see which libraries / binaries to remove, then do it yourself.  Does that
sound reasonably doable to you?  Don't use make uninstall, just use it for
inspiration when uninstalling the userspace tools.  Then run make
tools-install to build and install a new version of the tools.

You may need to install a few -dev packages to build successfully.

Cheers,
Mark

> On Thu, Jul 17, 2008 at 9:02 PM, Mark Williamson <
>
> mark.williamson@xxxxxxxxxxxx> wrote:
> > These errors typically happen when the Xen code was built against a
> > different
> > version of Python to the one that's available at runtime.  I've actually
> > found these are often harmless but that's probably not an appropriate
> > risk to
> > take for a production machine.
> >
> > Where exactly did you get your install source for Xen from?  Could you
> > just build Xen yourself rather than using a pre-compiled version?
> >
> > Cheers,
> > Mark
> >
> > On Thursday 17 July 2008, Antoine Benkemoun wrote:
> > > Hello,
> > >
> > > I am trying to install Xen 3.1.0 on a Debian Sid. I have been able to
> > > do this type of installation correctly with it working perfectly before
> > > but
> >
> > I
> >
> > > have to admit I can't get this one to work.
> > >
> > > Here are the error messages that I get at Xen startup :
> > >
> > > orangene1-hyp:~# /etc/init.d/xend start
> > > /usr/lib/python/xen/xend/server/SrvDaemon.py:20: RuntimeWarning: Python
> > > C API version mismatch for module xen.lowlevel.xc: This Python has API
> > > version 1013, module xen.lowlevel.xc has version 1012.
> > >   import xen.lowlevel.xc
> > > /usr/lib/python/xen/util/security.py:25: RuntimeWarning: Python C API
> > > version mismatch for module acm: This Python has API version 1013,
> > > module acm has version 1012.
> > >   from xen.lowlevel import acm
> > > /usr/lib/python/xen/xend/xenstore/xsutil.py:8: RuntimeWarning: Python C
> >
> > API
> >
> > > version mismatch for module xen.lowlevel.xs: This Python has API
> > > version 1013, module xen.lowlevel.xs has version 1012.
> > >   import xen.lowlevel.xs
> > > /usr/lib/python/xen/xend/XendBootloader.py:25: RuntimeWarning: Python C
> >
> > API
> >
> > > version mismatch for module ptsname: This Python has API version 1013,
> > > module ptsname has version 1012.
> > >   from xen.lowlevel import ptsname
> > > /usr/lib/python/xen/xend/server/SrvDaemon.py:20: RuntimeWarning: Python
> > > C API version mismatch for module xen.lowlevel.xc: This Python has API
> > > version 1013, module xen.lowlevel.xc has version 1012.
> > >   import xen.lowlevel.xc
> > > /usr/lib/python/xen/util/security.py:25: RuntimeWarning: Python C API
> > > version mismatch for module acm: This Python has API version 1013,
> > > module acm has version 1012.
> > >   from xen.lowlevel import acm
> > > /usr/lib/python/xen/xend/xenstore/xsutil.py:8: RuntimeWarning: Python C
> >
> > API
> >
> > > version mismatch for module xen.lowlevel.xs: This Python has API
> > > version 1013, module xen.lowlevel.xs has version 1012.
> > >   import xen.lowlevel.xs
> > > /usr/lib/python/xen/xend/XendBootloader.py:25: RuntimeWarning: Python C
> >
> > API
> >
> > > version mismatch for module ptsname: This Python has API version 1013,
> > > module ptsname has version 1012.
> > >   from xen.lowlevel import ptsname
> > >
> > > I have tried to install python from Sid and Lenny versions but none
> > > seem
> >
> > to
> >
> > > change any of this... I have no Python knowledge at all so I would like
> >
> > to
> >
> > > know if anybody would happen to have an idea concerning this problem.
> > >
> > > I will be happy to give you more info if there is something missing in
> >
> > this
> >
> > > post.
> > >
> > > Thank you in advance for your help,
> > >
> > > Antoine Benkemoun
> >
> > --
> > Push Me Pull You - Distributed SCM tool (

> > http://www.cl.cam.ac.uk/~maw48/pmpu/<http://www.cl.cam.ac.uk/%7Emaw48/pmp
> >u/> )



--

Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/)

--
Antoine Benkemoun
Tel : 03.51.53.57.00
Port : 06.32.88.59.35

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users