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CHAPTER 12 MULTIPLYING YOUR SERVER
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Installing Windows As a Guest Operating System on KVM
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Before installing Windows as your first guest operating system, you should ask yourself exactly what you want to do with the virtualized machines. Is your server running in a data center and are you accomplishing all tasks (including installation of the virtual machines) remotely If so, you can run it without a graphical user interface, but, if you want to be able to manage the virtual machine(s) from the physical server itself, it s a good idea to install a GUI. Read 3 to find out how to set up a GUI on your server. 1. To install Windows as a virtualized operating system, you first need to set up storage. The simplest way of trying out virtualization is by using a disk image file. You can create this by using dd or qemu-img as in the following command that creates an 8 GB disk image file with the name: qemu-img create windows.img -f qcow 8G 2. Now that you ve created the disk image file, you can use the kvm command to install Windows. Make sure that the Windows installation CD is in the drive (or use an ISO file) and run the following command to start the installation, creating a Windows virtual machine with a total of 512 MB of RAM. This command uses the windows.img disk file in the current directory. Boot from CD-ROM to install Windows. Want to use an ISO file instead of a physical CD-ROM Just replace /dev/cdrom by a complete path to the ISO file. The -no-acpi option used in this example isn t really required, but it s highly recommended to prevent problems using ACPI: kvm -no-acpi -m 512 -cdrom /dev/cdrom -boot d windows.img 3. This opens a QEMU window in which you ll see the Windows installer loading. Complete the Windows installation from this interface.
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Figure 12-1. With the required CPU support, KVM allows you to run virtual Windows machines.
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CHAPTER 12 MULTIPLYING YOUR SERVER
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4. Once the installation of virtualized Windows is finished, you can run it in the same way you installed it. Use the kvm command again, but omit the option -boot d which ensures that you re booting from CD-ROM first. So, the following command runs an installed instance of Windows that is on the windows.img file: kvm -no-acpi -m 512 -cdrom /dev/cdrom windows.img You now have your virtualized Windows machine. That was easy, wasn t it Next, we ll have a look at how to install Ubuntu as a guest on top of your Ubuntu Server virtualization host.
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Installing Ubuntu Server As a Guest Operating System on KVM
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After reading the previous section about installing Windows as a guest operating system in KVM, you probably can already guess how to install an instance of virtualized Ubuntu. Fundamentally, there are no differences between installing Windows or Ubuntu: you create a virtual disk and install Ubuntu Server on that. Assuming that the installation CD is in an ISO image with the name ubuntu.iso, you can use the following procedure: 1. Create the disk file: qemu-img create ubuntu.img -f qcow 4G 2. Use the kvm command to start the installation from the Ubuntu ISO file: kvm -m 256 -cdrom /isos/ubuntu.iso -boot d ubuntu.img
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Are you having problems installing Ubuntu or another Linux distribution as a guest operating system Tip
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That s because of the graphical menu that most boot loaders display nowadays before starting the installation. Try a nongraphical installation program such as the Ubuntu netboot mini.iso file instead. This will help you install any Linux distribution without problems.
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3. Boot the virtual Ubuntu Server you ve just installed with the following command, and you re done: kvm -m 256 ubuntu.img
Setting Up Networking in KVM Virtual Machines
The most convenient way to ensure that your virtual machines are reachable on the network is to create a virtual bridge on the host machine. This virtual bridge allows the machines to communicate with one another and also with other nodes on the network. To configure it, create the /etc/network/interfaces file as follows:
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