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# Set independent wall clock time
xen.independent_wallclock=1
3. As a third alternative, independent_wallclock=1 may also be passed as a boot parameter to the
VM.
Configuring VNC for VMs
VMs might not be set up to support Virtual Network Computing (VNC), which XenServer uses to control VMs
remotely, by default. Before you can connect with the XenCenter graphical console, you need to ensure that
the VNC server and an X display manager are installed on the VM and properly configured. This section
describes the procedures for configuring VNC on each of the supported Linux operating system distributions
to allow proper interactions with the XenCenter graphical console.
CentOS-based VMs should use the instructions for the Red Hat-based VMs below, as they use the same
base code to provide graphical VNC access. CentOS 4 is based on Red Hat Enterprise Linux 4, and CentOS
5 is based on Red Hat Enterprise Linux 5.
Enabling a graphical console on Debian Lenny VMs
The graphical console for Debian Lenny virtual machines is provided by a VNC server running inside the
VM. In the recommended configuration, this is controlled by a standard display manager so that a login
dialog is provided.
1. Install your Lenny guest with the desktop system packages, or install GDM (the display manager) using
apt (following standard procedures).
2. Install the Xvnc server using apt-get (or similar):
aptitude install vnc4server
3. Set up a VNC password (not having one is a serious security risk) using the vncpasswd command,
passing in a filename to write the password information to. For example:
vncpasswd /etc/vncpass
4. Modify your gdm.conf file (/etc/gdm/gdm.conf) to configure a VNC server to manage display 0
by extending the [servers] section as follows:
[servers]
0=VNC
[server-VNC]
name=VNC
command=/usr/bin/Xvnc -geometry 800x600 -PasswordFile /etc/vncpass BlacklistTimeout=0
flexible=true
5. Restart GDM, and then wait for the graphical console to be detected by XenCenter:
/etc/init.d/gdm restart
Note:
You can check that the VNC server is running using a command like ps ax | grep vnc.
Enabling a graphical console on Red Hat, CentOS, or Oracle Linux VMs
Note: