User manual NOVELL XEN ADMINISTRATION

[. . . ] SUSE Linux Enterprise Server 10 SP2 July 15, 2008 www. novell. com Virtualization with Xen Virtualization with Xen All content is copyright © Novell, Inc. Legal Notice This manual is protected under Novell intellectual property rights. By reproducing, duplicating or distributing this manual you explicitly agree to conform to the terms and conditions of this license agreement. This manual may be freely reproduced, duplicated and distributed either as such or as part of a bundled package in electronic and/or printed format, provided however that the following conditions are fulfilled: That this copyright notice and the names of authors and contributors appear clearly and distinctively on all reproduced, duplicated and distributed copies. [. . . ] To use the VNC viewer from a remote computer, remote administration must be enabled on the host. You can use the YaST Remote Administration module. Virtualization: Configuration Options and Settings 39 Figure 5. 1 YaST Remote Administration In addition to this, change vnc-listen in /etc/xen/xend-config. sxp to open the access to the VM Guest. This is necessary, if you encounter messages like vncviewer: ConnectToTcpAddr: connect: Connection refused from a remote host. For more information about modifying xend-config. sxp see Section 4. 2, "Controlling the Host by Modifying xend Settings" (page 29). To access the virtual machine from the local console or a remote computer running a VNC viewer client, enter one of the following commands: · vncviewer host_ip::590# · vncviewer host_ip:# where host_ip is the IP address of the virtual machine host and # is the VNC viewer port number assigned to the virtual machine. # vncviewer 192. 168. 3. 100::5901 If you are using the built-in VNC viewer of an Internet browser, such as Internet Explorer* or Mozilla* Firefox*, use 580# as the port number, where # is the VNC viewer port number assigned to the virtual machine. 40 Virtualization with Xen Figure 5. 2 Mozilla Firefox VNC Viewer When successfully connected, the VNC viewer shows the display of the running virtual machine. 5. 3. 1 Assigning VNC Viewer Port Numbers to Virtual Machines Although the default behavior of VNC viewer is to assign the first available port number, you might want to assign a specific VNC viewer port number to a specific virtual machine. To assign a specific port number on a fully virtualized guest, edit the virtual machine's setting (/etc/xen/vm/name) by including (vncdisplay #) where vnc=1 vncdisplay=# vncunused=0 vnc must be set to 1, # is the assigned port number and vncunused must exist and be set to 0 in order to make this work. On a paravirtualized guest, edit the line vfb=['type=vnc, vncdisplay=#'] to set the viewer port number to the desired value. TIP Assign higher port numbers to avoid conflict with port numbers assigned by the VNC viewer, which uses the lowest available port number. Virtualization: Configuration Options and Settings 41 5. 3. 2 Using SDL instead of a VNC Viewer If you access a virtual machine's display from the virtual machine host console (known as local or on-box access), you might want to use SDL instead of VNC viewer. VNC viewer is faster for viewing desktops over a network, but SDL is faster for viewing desktops from the same computer. To set the default to use SDL instead of VNC, change the virtual machine's configuration information to the following. For instructions, see Section 4. 3, "Configuring a Virtual Machine by Modifying its xend Settings" (page 30). · If it is a paravirtual virtual machine, use vfb=["type=sdl"]. Remember that, unlike a VNC viewer window, closing an SDL window terminates the virtual machine. 5. 4 The Boot Loader Program The boot loader controls how the virtualization software boots and runs. You can modify the boot loader properties by using YaST, or by directly editing the boot loader configuration file. The YaST boot loader program is located at YaST > System > Boot Loader. The Boot Loader Settings screen lists the sections that appear as options on the boot menu. From this screen, you can change the boot loader so it auto-selects the virtual machine host option when booting. 42 Virtualization with Xen Figure 5. 3 Boot Loader Settings Select the Xen section, then click Edit to manage the way the boot loader and Xen function. Figure 5. 4 Boot Loader Settings: Section Management You can use the Boot Loader program to specify functionality, such as: · Pass kernel command line parameters · Specify the kernel image and intial RAM disk Virtualization: Configuration Options and Settings 43 · Select a specific hypervisor · Pass additional parameters to the hypervisor (see /usr/share/doc/packages/ xen/pdf/user. pdf section "Xen Boot Options" after installing the package xen-doc-pdf). You can customize your virtualization environment by editing the /boot/grub/ menu. lst file. If the Xen option does not appear on the GRUB boot menu, you can compare your updated GRUB boot loader file with the examples below to confirm that it was updated correctly. The first example shows a typical GRUB boot loader file updated to load the kernel that supports virtualization software. The second example shows a GRUB boot loader file that loads the PAE-enabled virtualization kernel. [. . . ] This section provides instructions for running SUSE Linux Enterprise as a fully virtual guest with Xen drivers. Running SUSE Linux Enterprise requires a VM Host Server based on SUSE Linux Enterprise Server 10 SP2 or later. The supported guest systems are SUSE Linux Enterprise Server 9 SP4 or later. 7. 6. 1 Setting Up a new Virtual Machine 1 Create a new fully virtual machine or start an existing fully virtual machine. 2 Get the latest updates for the operating system from your update channel. [. . . ]