Xen users - Feb 2011 - can vnc line in domu.cfg be a problem for failed installation

Hi,

What does it take for vnc to work with Xen .As far as I understand vnc
is inbuilt in Xen (at least for DomU)
As per this link
http://markmail.org/message/hdvc5ze3zie3no6g?q=xen+list:com.xensource.lists.xen-users+vnc
What I understand from this link
http://markmail.org/message/rmmcdwpqdux4qbay
is xen-vncfb is the library which should be present.

I wanted to know with respect to a thread here (which is my question only)
http://www.linuxquestions.org/questions/linux-virtualization-90/server-hangs-while-having-a-text-based-installation-of-centos-domu-on-lenny-808651/#post4244279
the experiment was tried 7-8 months back where in I tried to create a
CentOS DomU on Debian Dom0 ,
this experiment had failed badly.

Now one fellow on the above form (Linuxquestions.org)  suggested he
had resolved similar problem by commenting out

vfb = [ "type=vnc,vncunused=1,keymap=en-us" ]

Since I no more have the Debian thing and Xen working on it so I can
not test this part but

I would like to know (may my question will help many others)

1) Can I confirm via some link that the reply I got is correct?
2) Has any one experienced some thing similar if yes then what did
they do to resolve.

I remember I had created a Qemu guest also and then filled the LVM
with the QEMU guest files.
But things had not worked at that time as vnc was the only thing which
had failed.


Let me know what is some thing which one should check where some guest
creation is failing.
I remember a long time back a friend of mine had done some
installation when some libraries were giving problem by
doing a set -vx to the installer script and he was able to watch all
that was happening.
Is there some thing similar possible to know when a guest creation fails on Xen.

I do not remember the correct link but what I remember is
virt-manager and debootstrap have different mechanisms of creating
guests is this correct?

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On Tue, Feb 1, 2011 at 1:14 PM, Tapas Mishra <mightydreams@gmail.com>
wrote:
>
> Now one fellow on the above form (Linuxquestions.org)  suggested he
> had resolved similar problem by commenting out
>
> vfb = [ "type=vnc,vncunused=1,keymap=en-us" ]
>
> Since I no more have the Debian thing and Xen working on it so I can
> not test this part but
>
> I would like to know (may my question will help many others)
>
> 1) Can I confirm via some link that the reply I got is correct?
> 2) Has any one experienced some thing similar if yes then what did
> they do to resolve.
>
I''m not familiar with rinse or xen-create-image, but here''s
what I
know when installing RHEL/Centos on Xen:
1) You can use virt-manager (the easy way), or do it manually (like
http://wiki.centos.org/HowTos/Xen/InstallingCentOSDomU)
2) domU can use xen text console (xvc0 or hvc0), vnc console, or both.
3) If domU is setup using vnc console (like when setup with
virt-manager), text console is usually not used
4) you can always setup text console manually. See
http://wiki.xensource.com/xenwiki/XenCommonProblems, look for
"console"
5) incorrect/incompatible vnc settings can cause domU fail to start.
On some versions of Xen I had to remove "vncunused=0" line to make it
start correctly.

-- 
Fajar

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