Hi all,
looks I am somewhat stuck with getting X11 to run inside a DomU.
Searching for this gives me only little help. As far as I understand, it
does not work out of the box because there is on real graphics hardware
available. That definitely explains the output of the X server,
complaining about not finding any screens to use.
One thing seems to be provide an external framebuffer, as described
here: http://wiki.xensource.com/xenwiki/VirtualFramebuffer
This page is dated Feb 2008, so is there any important news about this?
The last line is most discouraging to me, is there any interesting
updates regarding desktop size? What about performance? Well, I'll try
that now anyway.
In addition, as the VM runs fine in HVM (including X), is there any way
to configure an emulated graphics device for a pv DomU? Reads strange...
But with graphics hardware not being virtualizable, something like this
would help.
Any hints/links/documentation on my problem is really appreciated.
Thanks!
Regards,
Martin
Martin Troester wrote:
Jeff,
thanks for the steps to move an existing physical image to a paravirt
DomU image. However, I think this only works if both Dom0 and DomU use
the same architecture (64bit e.g.). In my case, my host is a 64bit Dom0
with 32bit DomU guests, so I think it's at least necessary to get 32bit
kernel and initrd images someplace. Is there an official way to get the
released 32bit xen kernel versions to be used on a 64bit host? Otherwise
there's no problem to get them manually, but that means not getting
auto-updates...
In addition, I found some comments on the list about CentOS 5.3 initrd
images coming with scsi modules, and thus not working without rebuilding
or manually changing to disable scsi.
Therefore I did the following steps to get an HVM VM initially
transformed to PV:
1) get a known-good Centos image for Xen, e.g. at
http://stacklet.com/downloads/images/centos/5.3
2) make sure that image works for you with pygrub
3) extract kernel, initrd and /lib/modules/
3) make it work with kernel/initrd/parameters provided externally
3a) don't use a wrong option for ramdisk support ;-)
4) add /lib/modules extracted from other image to HVM image
5a) add kernel parameter "console=/dev/tty" to prove it boots up
5b) modify /etc/securetty and /etc/inittab (if not done yet by your
distro), see
http://xen.xensource.com/files/xensummit_4/xensummit_linux_console_slides.pdf
6) boot up the HVM VM in paravirtualized mode
Especially 5) caused me some trouble, as without this option in
/etc/inittab, the VM just froze before bringing the login prompt.
This is how far I got in a few hours tonight, but now the previously
automatically launching X server does not start. Well, but I'm getting
closer.
Open question:
- how to get a Centos 32bit Xen DomU kernel on a 64bit host via
repositories?
Ultimatively, it will probably be best to use pygrub and do the kernel
management from inside the VM (this will also be easier when thinking
about /lib/modules). But at least for my VM, the harddisk layout does
not work with pygrup (yet).
Regards,
Martin
Jeff Sturm wrote:
-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Martin Troester
Sent: Tuesday, September 22, 2009 4:17 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Creating a paravirtualized guest with Xen
3.4.1 andCentos
5.3 (64bit)
Now I'll find out if I can get my original problem solved, migrate the
existing fully virtualized system to a paravirtualizded kernel. Let's
see...
It's not exactly the same, but I have done physical-to-paravirt
migrations on CentOS 5.2 with little effort. It's probably easiest if
you install kernel-xen packages before you migrate:
1) yum install kernel-xen
2) shutdown
3) copy disk images to dom0
4) create domU config
5) start domU
Afterwards you can use either pygrub or kernel/ramdisk, whichever you
prefer.
-Jeff
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