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can then use Virtual Machine Manager and the
xm
command to manage virtual
machines and the
vm-install
command to create them.
Text Only
You can use the
ssh
command from a remote computer to log in to a virtual ma-
chine host and access its text-based console. You can then use the
xm
command
to manage virtual machines and the
vm-install
command to create new virtual
machines.
8.3 VNC Viewer
By default, Virtual Machine Manager uses the VNC viewer to show the display of a
virtual machine. You can also use VNC viewer from Domain0 (known as local access
or on-box access) or from a remote computer.
You can use the IP address of a VM Host Server and a VNC viewer to view the display
of this VM Guest. When a virtual machine is running, the VNC server on the host assigns
the virtual machine a port number to be used for VNC viewer connections. The assigned
port number is the lowest port number available when the virtual machine starts. The
number is only available for the virtual machine while it is running. After shutting
down, the port number might be assigned to other virtual machines.
For example, if ports 1 and 2 and 4 and 5 are assigned to the running virtual machines,
the VNC viewer assigns the lowest available port number, 3. If port number 3 is still
in use the next time the virtual machine starts, the VNC server assigns a different port
number to the virtual machine.
To use the VNC viewer from a remote computer, the firewall must permit access to as
many ports as VM Guest systems run from. This means from port 5900 and up. For
example, if you want to run 10 VM Guest systems, you will have to open the tcp ports
5900:5910.
In addition to this, change
vnc-listen
in
/etc/xen/xend-config.sxp
to
open the access to the VM Guest. For more information about modifying
xend-config.sxp
see Section 5.2, “Controlling the Host by Modifying Xend Set-
tings” (page 36).
Virtualization: Configuration Options and Settings 67