Installing and Configuring Fedora Xen Virtualization. Purchase and download the fully updated Fedora 1. PDF and e. Pub versions of this e. Book for only $9. PDF/e. Pub editions contain 4. Virtualization is the ability to run multiple operating systems simultaneously on a single computer system. For example, you can try out Ubuntu Linux without having to re- partition the disk, shut down Fedora Linux and then boot from Ubuntu Linux. You simply start up a virtualized version of Ubuntu as a guest operating system. Options include VMware and KVM. One of the most popular technologies on Fedora is called Xen. Red Hat engineers have invested considerable effort into making Xen easy to install, configure and manage on both Red Hat Enterprise Linux and Fedora. Many of these improvements appeared in Fedora 7. Some Linux operating system distributions install a Xen Linux kernel by default (such as RHEL 5, CentOS 5, Oracle Enterprise Linux and Fedora Core 7 and higher). In these cases, deselect the Virtualization option during the. For these reasons, this chapter will focus on Xen Virtualization in Fedora and will assume you are using Fedora 7 or Fedora 8. Whilst it is possible to run these versions of Fedora inside Xen virtual machines (as a dom. U), these newer Fedora releases cannot be used to host Xen based virtual machines (dom. It is hoped that this support will return with the introduction Xen 3. Fedora 1. 2. If you are using one of these versions of Fedora we recommend using KVM virtualization as outlined in the chapter entitled Installing and Configuring Fedora KVM Virtualization. Para- Virtualization. There are two common approaches to virtualization - full virtualization and para- virtualization. Full virtualization provides complete abstraction between the hardware and the guest operating system. In this scenario, the guest operating system is provided a complete virtual physical environment in which to run and, as such, is unaware that it is running inside a virtual machine. One advantage of full virtualization is that the operating system does not need to be modified in order to run in a virtualized environment. This means that proprietary operating systems such as Windows can be run on Linux systems. This typically means that guest operating systems are limited to open source systems such as Linux. It is also not possible to migrate a running guest OS from one server to another. The advantage to this approach, however, is that a para- virtualized guest system comes closer to native performance than a fully virtualized guest, and the latest virtualization CPU support is not needed. It is important, therefore, that there is enough disk space available to install your choice of guest operating system. As a guideline, a command line version of Fedora Linux requires approximately 6. Mb of disk space. Fedora Workstation is a polished, easy to use operating system for laptop and desktop computers, with a complete set of tools for developers and makers of all kinds. Creating and installing a CentOS 5 domU instance. This is a step-by-step tutorial how to install Xen hypervisor 4.0.1 and the long-term maintained Linux pvops dom0 kernel 2.6.32.x on Fedora 13 (x86. As a default Fedora 13 includes Xen 3.4.3 RPMs, but this tutorial. Some installation numbers install the virtualized kernel by default. A full installation of Fedora (including graphical desktop) requires around 4. GB of disk space. Sufficient memory is required to run both the host operating system and the guest operating systems. If the guest operating system is not using a desktop environment, then it is possible to allocate 2. Mb of memory to the guest OS. A full, graphical desktop Linux installation will require considerably more (a minimum of between 3. Mb will provide reasonable, but not spectacular, performance). To verify that your CPU supports PAE run the following command from a Terminal window. If no output is displayed, then your CPU is not able to support Xen virtualization. If, on the other hand, you see output similar to the following, then you can proceed with the Xen configuration. This can be verified using the following commands. For Intel CPUs. grep vmx /proc/cpuinfo. If your system does not include this support you can still use Xen in para- virtualization mode. You will not, however, be able to run Microsoft Windows as a guest operating system. By default, Fedora does not install this Kernel or these tools. The next step, therefore, is to prepare the operating system for Xen. Begin by installing the virtualization tools and kernel as follows. Virtualization'. This command will install all the required packages, and configure the boot loader to provide a Xen virtualization option when the system is next booted. When the boot screen appears hit any key to enter to boot menu and select the Fedora Xen boot option. If a Xen boot option is not provided, boot using the standard Linux kernel and execute the following commands before rebooting once again. When the boot has completed, log in as usual and open a Terminal window. In that window run the following command to verify that kernel with Xen support has loaded. You should expect to see output similar to the following. You can also check that Xen is running with the following command. This command will list any currently running Xen machines. When guest operating systems are running, these too will be listed. For the purposes of this chapter we will use the virt- manager tool. Once loaded, the virtual manager will display the following screen. To create a new guest system, click on the New button to display the first configuration screen. Click the Forward button to proceed to the Naming screen and enter a name for the virtual machine. This can be any name you choose. The Full virtualization option will only be selectable if your hardware supports it. Select Para- virtualized and press Forward. The next screen requires information about the location of the operating system installation files. Currently guest operating systems can only be installed over a network or the internet. The easiest way is to provide the http address of the operating system installation files. To install the i. Fedora 7 distribution you might, for example, enter. Fedora/i. 38. 6/os/Alternatively, select a mirror site closest to your geographical location from the Fedora mirror list. Otherwise, select Simple file and enter the path of the file to be created and select a file size (keeping in mind the space requirements for your chosen guest OS). Click the Forward key once more. This will configure the guest OS to share the host operating system's network connection. If you plan to run multiple guest operating systems, be sure to allow for this. The final screen displays a summary of the configuration. Click on the Finish button to begin the creation process. The virtualization manager will create the disk and configure Xen before starting the system. Once started, the guest OS installation will begin. From this point on, simply follow the operating installation instructions to install the guest OS. HOWTO INSTALL xen on fedora 1.
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