dynamically generate barcode in asp.net c# Figure 13-4. To allow for an easy installation, install from an ISO image. in Font

Generating Data Matrix in Font Figure 13-4. To allow for an easy installation, install from an ISO image.

Figure 13-4. To allow for an easy installation, install from an ISO image.
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CHAPTER 13 MULTIPLYING YOUR SERVER
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6. Indicate what you want to install to (see Figure 13-5). For best performance, it is a good idea to give every virtual machine a dedicated partition or LVM logical volume. If you can t do that, you can install to a file instead. The installation interface creates this virtual disk file automatically for you.
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Figure 13-5. For best performance, use a partition or LVM logical volume as the storage backend. 7. Select the networking method that you want to use. The most flexible way is to create a virtual network. In this configuration, a network bridge is created in the network. If your server has a fixed IP address, you can also choose to assign a second IP address to the network interface by selecting the Shared physical device option. After making your choice, click Forward to proceed. 8. Enter the amount of RAM and CPUs you want to give to your virtual machine (see Figure 13-6); click Forward. Notice the difference that the utility makes between a logical CPU and a virtual CPU. A logical CPU is present on your physical hardware, either as a real CPU or as a CPU core on a multicore processor. A virtual CPU is present in the virtual machine. It can use any type of logical CPU.
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Figure 13-6. Each virtual machine gets its own amount of RAM and virtual CPUs. 9. In the last screen of the wizard, you see an overview of the installation settings that will be used. Are you happy with them Click Forward to start the installation and complete the installation of the virtual operating system. Once completed, you ll see that the new virtual machine is added to the virt-manager interface; you ll be able to manage it from there.
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Managing Virtual Machines with libvirt Tools
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Even if virt-manager provides an easy way to set up and manage virtual machines, it is not the only way. The libvirt tools allow you to create and manage virtual machines without the need to run any graphical tools. It offers VNC access, so after you set up the virtual machine, you can make a VNC connection to it.
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To create virtual machines, you can use the virt-install command. By default it is not present on your server, so first make sure to run the apt-get install python-virtinst command as root. Next, you can create a virtual machine from the command line, with a command such as the following: virt-install -n testserver -r 512 -f /dev/system/testserver -s 10\ -c jeos.iso --accelerate --vnc --noautoconsole In this command, a number of options are being used to define the virtual machine:
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CHAPTER 13 MULTIPLYING YOUR SERVER
-n testserver: This option sets the name of the virtual machine to testserver. You ll need this name to start the virtual server again later. -r 512: This option grants 512 MB of RAM to the virtual server. -f /dev/system/testserver: This option specifies what to use as the virtual hard disk for your virtual machine. I like creating an LVM logical volume for each of my virtual machines, but you don t have to do that. Instead, you can refer to a disk image file that you have created earlier. Make sure that the device or disk file that you are referring to exists before copying over the virtual machine! -s 10: This option specifies the size in gigabytes for the virtual disk. -c jeos.iso: This option tells the installer from which device to start the installation. --accelerate: This option uses the kernel acceleration features to make it faster. --vnc: This option enables VNC access. --noautoconsole: Use this option to not attach automatically to the console of the virtual machine. It makes sense if you are using virt-install on a server that doesn t have a GUI. If you use it in a graphical environment, however, omit this option, which will automatically give you access to the console of the virtual machine. After launching virt-install this way, you can connect to the console of the virtual machine locally if you have a GUI on your server, or you can connect remotely using the virt-viewer utility.
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