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recognized as eth0 in the virtualized operating system. This eth0 is represented in the domain 0 operating system by an interface with the name vifx.y. In this name, x represents the ID of the virtualized operating system, and y represents the number of the virtualized network board. For example, the eth0 network card in domain 0 (which has ID 0) is represented as vif0.0; likewise, if a virtualized Windows server that has ID 4 (use the xm list command to learn the ID of a virtualized operating system) has four virtualized network cards, the second of them would be represented by vif4.1 in domain 0. Now in the domain 0 system, all vif interfaces are attached to the virtual bridge, which is thus behaving like a real bridge or switch. This bridge in turn communicates with the representation of the physical network card, which is peth0 and talks directly to the network board in your server. Check Figure 13-7 for a graphical representation of how all this is organized.
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Figure 13-7. The virtual bridge in a Xen environment After creating the virtual network, you have a bit more preparation work: edit the /etc/modules file and add the line loop max_loop=64. This is necessary to ensure that you can create enough virtual disks for your virtual machines. To confirm that this new setting works, reboot your machine before starting to create virtual machines.
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Installing Windows as a Guest Operating System on Xen
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To install Windows as a guest operating system in a Xen environment, you need a CPU that supports virtualization because Windows itself doesn t exist in a version that understands paravirtualization. So the only way to virtualize it is to use a CPU that has hardware virtualization
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support. To check your CPU, use the xm dmesg command to see an overview of all features that are relevant for Xen virtualization: root@lor:~# xm dmesg | grep VMX (XEN) HVM: VMX enabled (XEN) VMX: MSR intercept bitmap enabled If you see a result such as this one, you can continue creating your instance of virtualized Windows. If you don t get a result, your CPU doesn t support virtualization, which means that you can t virtualize Windows. Sorry! So, if your processor has VMX, let s start virtualizing Windows. 1. To install Windows or any other virtualized operating system, it s a good idea to enable a VNC server. This lets you connect to the console of the virtualized machine while installing it. Without this VNC server, your only option is headless installation, which isn t easy at all. So make sure that the /etc/xen/xend-config.sxp configuration file includes the following line. After changing it, restart the xend process: (vnc-listen '0.0.0.0') 2. Now you need to make sure that the guest system has a hard disk to use, and the easiest way to create such a disk is to use disk image files. The /var/lib/xend/storage directory is a convenient place to put such a file. Use the following line to create a 4 GB disk image file in this directory: dd if=/dev/zero of=/var/lib/xend/storage/windows.img bs=1024 count=4000000 3. Next, you need to create a configuration file for the guest system. This file will contain all the settings used by the guest system, such as the amount of RAM it can use, the hard disk, and so on. The configuration shown in Listing 13-4 can be used to create a Windows XP virtual machine that uses 512 MB of RAM and a 4 GB hard disk, and accesses the optical disk in /dev/cdrom as the optical drive. Create this file with the name /etc/xen/windowsxp. Listing 13-4. Example Configuration File to Create a Windows XP Virtual Machine kernel = '/usr/lib/xen-ioemu-3.0/boot/hvmloader' device_mode1 = '/usr/lib/xen-ioemu-3.0/bin/qemu-0dm' builder = 'hvm' memory = '512' disk = [ 'file:/var/lib/xend/storage/windows.img,ioemu:hda,w'\ , 'phy:/dev/cdrom,ioemu:hdc,r'] name = 'winxp' vif = [ 'type=ioemu, bridge=xenbr0' ] boot='d' # use boot='c' to boot from harddisk vnc=1 vncviewer=1 sd1=0
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