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To run Xen on your Linux machine, you need to make sure you have the proper CPU and enough memory. You should be one of the recent Pentium-class CPUs, such as Pentium Pro, Celeron, AMD Athlon, and AMD Duron. These CPUs have the x86 architecture instructions that Xen can use to provide virtualization. If you have the 64-bit equivalents to these, your Xen setup will perform even better. Having lots of memory on your hardware is beneficial to your Xen setup. The more memory you have, the more virtual machines you can run. For example, in a machine that has 1 GB RAM, up to three virtual machines with 256 MB RAM can be run with decent speed and performance. You can start with 1 GB of RAM for your practice on Xen.
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CHAPTER 18 LINUX VIRTUALIZATION
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After you have the double-checked that your system meets these requirements, it s time to install Xen.
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It is a good idea to disable SELinux before you begin the Xen installation. If SELinux is active, you might encounter permission problems when running guests and administering Xen. To turn it off, open the configuration file called config inside the /etc/selinux directory, and find the following line: SELINUX=enforcing Change it to this: SELINUX=disabled Then save the file. Xen is not included in the default CentOS installation. To install the Linux kernel modified to run Xen and its tools, use the following command: yum install xen
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After the installation completes, your system will also update the contents of the GRUB configuration file and place the modified Linux kernel or the Xen kernel on top of the selection. You can open the GRUB configuration file (grub.conf) inside the /etc directory and see if the top entry has a title similar to this: title CentOS (2.6.18-128.2.1.el5xen) If you have this, you can boot the Xen kernel. Reboot the system, and choose the first entry in the GRUB menu (or the entry with the word xen on it) to load the Xen s hypervisor. If you do not see the line that contains the word xen, your Xen setup may have not completed successfully. Try to run the yum install xen command again and see if it gets installed properly.
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Note: GRUB is covered in 3.
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After installing and rebooting the system into the Xen kernel, you should notice that the boot log contains a lot of Xen-oriented messages running through the screen. Those messages are informing you that the Xen kernel is being loaded. When you log into the system, you are now using the Xen kernel and are ready to create virtual machines for guest operating systems. If you re not sure whether the kernel you are using is the Xen kernel, you can issue the command uname, which tells you what kernel version you have loaded. If the value uname shows contain the xen word, you are running the Xen kernel.
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CHAPTER 18 LINUX VIRTUALIZATION
The installation of Xen package included libvirt, a set of utilities that can help you manage virtualization technologies available under Linux, including QEMU and OpenVZ as well as Xen. With libvirt, you can create guest images to install and administer guest operating systems. To learn about the many things you can do with libvirt, visit the web site at http://www.libvirt.org.
The xend Daemon
After you have booted your hypervisor kernel, a daemon called xend is also started. The xend daemon included with Xen provides consoles to allow administrators to manage guests. With xend, the guests can be started and rebooted using Xen command line tools such as xm. You can start the xend daemon manually by using service xend start.
The xend Configuration Files
The xend daemon stores its configuration files inside the /etc/xen directory along with the guest configuration files. The configuration files it uses are xend-config.sxp, xend-pci-permissive.sxp, and xend-pci-quirks.sxp. The last file called qemu-ifup is a shell script that lets Xen use QEMU for using networking on guests.
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