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After reading this, you may wonder which of the two approaches is best for your situation. Unfortunately, you can t always choose the ideal solution. If your operating system doesn t offer paravirtualization support, full virtualization is the only way to go. But if both your CPU and your operating system have virtualization support, it s always better to use paravirtualization because the virtualized operating system generates instructions that are optimized for a virtualized environment. In this way, the performance loss due to virtualization is kept to a bare minimum. If you can t use paravirtualization because your operating system doesn t support it, you can see if paravirtualized drivers are available. Such drivers are supplied in some cases, and they can help increase the performance of particular devices such as your network interface card, hard drive, and other I/O devices. In other situations, however, you ll find that full virtualization is the only solution because the operating system you want to virtualize doesn t give you a choice or as with KVM virtualization paravirtualization for complete operating systems is not yet supported. Therefore, the hands-on parts of this chapter assume that you have a CPU with virtualization support.
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Most modern Pentium IV and Xeon processors offer support for virtualization. If you re not sure about Tip
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your CPU, just check the system s BIOS. If virtualization is supported, the BIOS will include a virtualization option. As an alternative, you can also check the /proc/cpuinfo file for the VMX flag for your CPU. If it s there, your CPU supports full virtualization.
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Installing Virtual Machines with KVM
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If your CPU supports virtualization, KVM-based virtualization is the easiest to use (although this is a very recent development). In this section, you ll read how to prepare your machine as a KVM virtualization host, and then you ll learn how to install Windows and Ubuntu as virtualized operating systems in the KVM-virtualized environment.
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CHAPTER 13 MULTIPLYING YOUR SERVER
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Caution When using virtualization, it s a very good idea to differentiate between the host operating system and the others. The host operating system is the first operating system that your server boots. It also has some very specific responsibilities for the other operating systems, such as managing access to drivers and managing the virtual machines themselves. To make sure that it can perform these tasks in the most efficient way, don t run any services (other than virtualization services) in the host operating system!
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Preparing Your Server for KVM Virtualization: Networking
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On a server in which virtualization is used, you can have more virtual machines than you have network cards. Therefore, a solution needs to be implemented for the virtual machines to share network boards in your server. To make this possible, you need to create a virtual network bridge by redefining the contents of the /etc/network/interface file (as shown in the example in Listing 13-1). This code is meant to replace all contents that you currently have in this file. Listing 13-1. A Network Bridge Provides Network Access for All Virtual Machines auto lo iface lo inet loopback auto br0 iface br0 inet static address 192.168.1.99 network 192.168.1.0 netmask 255.255.255.0 broadcast 192.168.1.255 gateway 192.168.1.254 bridge_ports eth0 bridge_fd 0 bridge_hello 2 bridge_maxage 12 bridge_stop off This configuration file makes sure that a device with the name br0 is created to replace the eth0 device when you reboot your server or restart your network. However, this device is meant to use eth0 as its physical back end, as specified by the line bridge ports eth0. After creating the configuration file in this way, use sudo /etc/init.d/networking restart to restart the network. Your network is now ready to handle KVM virtual machines.
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