[Xen-users] Xlib: connection to ":0.0" refused by server

[oz <oz@xxxxxxxxxxx>]

Hello,

I'm doing my first steps with Xen and have my first domU up now 
(Debian/sid under Debian/sid).
The main problem I had, was to bring up the graphical desktop of  the  
guest with vnc4server. The solution was simple - but not easy to find 
for me - so let me share it:
Whenever I tried to login on xdm or gdm via xvnc4viewer coming from 
dom0, I found errors in .xsession-errors of the login-user:
...
Xlib: connection to ":0.0" refused by server
...

The solution was to delete the .Xauthority file in the home-dir of the 
login-user (... but don't ask me why, I only came to this idea by heavy 
googling). -
Being my first contact with Xen, I missed a general abstract, how the 
xen components are "glued" together. I mean something rudimental like 
this example, which reflects my first xen setup:
*  Boot a xen host system with grub using the Package 
xen-hypervisor-3.0-unstable-1-i386:
/boot/grub/menu.lst
...
title  Debian xen-3.0, kernel 2.6.18-1-xen-686 /dev/sda10
root (hd0,9)
kernel /boot/xen-3.0-unstable-1-i386.gz
module /boot/vmlinuz-2.6.18-1-xen-686 root=/dev/sda10 ro console=tty0
module /boot/initrd.img-2.6.18-1-xen-686

* Prepare the host for networking with a new guest, for example set 
(network-script network-bridge) and deactivate (network-script 
network-dummy) in Debian's default  /etc/xen/xend-config.sxp.
* Create the guest system with  xen-tools and 
xen-linux-system-2.6.18-1-xen-686. With xen-tools a basic guest 
distribution can be downloaded and an installed using the option 
debootstrap. Let the guest be installed in one big file like disk.img 
and a swap file swap.img for example. Use dhcp for convenience doing all 
the eth-settings (when you have your own a dhcp-server). The kernel, you 
boot your guest with, has to reside in your host filesystem, for example:
kernel  = '/boot/vmlinuz-2.6.18-1-xen-686'
ramdisk = '/boot/initrd.img-2.6.18-1-xen-686'

* Start your new guest machine with "console connected", so you can 
watch the boot messages:
# xm create myguest.cfg -c

* Install a virtual xserver like the vnc4server Debian-Package, if you 
like to see a graphical desktop of your guest in a host-window. For 
graphical authorisation use a display-manager like xdm or gdm and a 
small window-manager like  icewm or icewm-experimental. Example configs 
can be:
/etc/X11/xdm/Xservers
...
##:0 local /usr/bin/X vt7 -dpi 100 -nolisten tcp
:0 local /usr/bin/Xvnc -geometry 1024x768 -depth 24 -rfbauth 
/root/.vnc/passwd
...
or
/etc/gdm/gdm.conf
...
[servers]
0=VNC
[server-VNC]
name=VNC server
command=/usr/bin/Xvnc -geometry 800x600 -depth 24 -rfbauth /root/.vnc/passwd
flexible=true

The /root/.vnc/passwd for granting access to the VNC-Server can be 
created with vnc4passwd.
* Access the desktop of your new virtual machine via network with
xvnc4viewer <guest IP>


Hope it helps some xen-newbies like me,
Oliver

(Thanks to all those great minds developing Xen!)

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