Re: [Xen-users] VNC console access in paravirtualized domUs

[jim burns <jim_burn@xxxxxxxxxxxxx>]

On Thursday June 05 2008 11:35:48 pm Ray Barnes wrote:
> Thanks Jim.  I have no xorg.conf:
>
> debian:/dev# find / -print|grep -i xorg
> debian:/dev#

Probably a 'chicken or the egg' problem - you probably don't get 
an /etc/X11/xorg.conf until you have a desktop you can run display device 
configuration from :-) This is usually handled by your domu installer.

> I'm also trying to figure out what bearing xorg has on this, being
> paravirtualized.  Are you saying that xorg is mandatory in order to
> receive the text output of the console via VNC?  For absolute clarity,
> I have no interest in running X or VNC on the domU.  Although I did
> install it via 'apt-get -y install xorg' I could find no reference to
> fbdev in xorg.conf.  Are there alternatives, i.e. backported kernels
> from Lenny/Sid?

Vnc itself requires some sort of frame buffer device, which is only supported 
in X. It's not a pv or hvm thing - it's a virtual device thing.

Now if you only want text output, all you need is 'xm create -c dom.cfg'. If 
you want the boot message output, you probably want to put back 
the 'console=xvc0' clause. Where you put this depends on your cfg's kernel= 
parm. If you have 'kernel='/usr/bin/pygrub', you want it in your 
domu's /boot/grub/grub.conf (or menu.lst for SuSE) at the end of the 'kernel' 
line. If you have kernel=path-to-kernel-in-dom0, you want it in the extra= 
parm of your domu's .cfg. (If you are trying to boot a 2.6.24 or higher 
kernel, this becomes hvc0 instead of xvc0. My Fedora 9 pv is pretty good 
about knowing the default, tho'.)

Additionally, if you want to log in after the boot messages, you need a getty 
running on xvc0 (or hvc0). In the domu's /etc/inittab, near the end in the 
getty section, I have co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav, and 
the xvc0 device has to be listed in /etc/securetty. Personally, tho' I just 
use ssh to log in to the domu, since it adapts to my terminal size better.

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