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pygrub using barcode integrated for none control to generate, create none image in none applications.printing ean 13 c# The easiest method to boot a none for none prebuilt image is to use the pygrub bootloader. Pygrub is a Python script that imitates the GRU included in Xen and allows you to boot from a kernel that resides within the DomU disk or partition image, thus allowing a D self-contained, except for its configuration file. To set up the image for pygrub , the disk image itself must contain an appro configuration file that lists a kernel.

This GRUB configuration file is contained within the DomU disk image file just like a typi file resides within the root file system on a nonvirtualized machine. Listing 5.7 shows an example GRUB configuration file.

Th configuration file that you would use on a normal system using the first partition of the first hard drive. The pygrub bootload standard GRUB configuration file to boot the kernel contained within the DomU guest..

Beaware of Malicious QR Codes Listing 5.7. An Example GRUB configuration file default 0 timeout 10 root (hd0,0) kernel /boot/<kernel> initrd /boot/<initrd> To use pygrub as the bootloa der, all you need to do is add the bootloader option to the DomU guest configuration file and p binary, which is stored at /usr/bin/pygrub , during a default Xen installation. Listing 5.8 shows a complete working DomU disk image that we downloaded from rPath.

We focus on the bootloader and disk parameters in this chapter, but you can no and name parameters as well. The bootloader option specifies the program that Xen will use to boot this guest; in this case /usr/bin/pygrub . Notice that we use xvda for the disk that the guest will see, because the image that we downloaded was as well as other DomU guest configuration files, should be stored in /etc/xen .

Listing 5.8. The Guest Configuration File That Uses pygrub for Its Bootloader.

bootloader = "/usr/bin/pygru none for none b" disk = ["file:/xen/images/openfiler-2.2-x86.img,xvda,w"] memory = 256 vif = [""] name = "openfiler".

Next, before we can download and place the disk image from rPath, we recommend creating a more convenient and central DomU guest images for future use. If you have not previously created a default location for Xen images, we recommend tha directory /xen/images . Some distributions might have a location for these images as noted in the official distribution docum instance, Fedora stores Xen DomU images in /var/lib/xen/images/ .

The command to create a directory is mkdir , and yo to create the parent directories as needed.. Specifically for this exampl none none e, we downloaded the Openfiler NAS/SAN Appliance from www.rpath.org/rbuilder/project/openfile a Linux distribution that provides file-based Network Attached Storage and block-based Storage Area Networking in a single also find a cached copy available on the Web site for this book.

For this example, we choose the x86 Raw Hard Disk Image v virtual machine appliance. (Notice that this disk image can also be used by Parallels and QEMU.) Specifically for this exampl 2.

2 and the file openfiler-2.2-x86.img.

gz , which we extract with gunzip to openfiler-2.2-x86.img and put it in our /xe Listing 5.

9 shows the process of extracting the image and putting it in place. The gunzip command is used to extract the file is used to put it in the /xen/images directory. Listing 5.

9. Extracting and Placing openfiler Image Downloaded from rPath. [root@dom0]# gunzip openfile r-2.2-x86.img.

gz [root@dom0]# mkdir -p /xen/images [root@dom0]# mv openfiler-2.2-x86.img /xen/images [root@dom0]#.

Finally, with the configurat none for none ion file and disk image in place, the xm create command, as shown in Listing 5.10 , boots the gu bootloader. Figure 5.

2 shows the boot menu with pygrub .. Figure 5.2. The pygrub bootloader menu appears after running the xm create command. [View full size image]. To actually boot the downloa ded image, use the command xm create -c name , where name is the filename of the configura 2 , "A Quick Tour With the Xen LiveCD," that the -c option displays the guest"s virtual console in addition to starting on using xm create , refer to 6 and Appendix B , "The xm Command." The xm create command first looks in the cu DomU guest configuration file specified by name . If a file does not exist in the current directory, it then looks in the /etc/xe also pass the full path of the DomU guest configuration file to the xm create command.

Listing 5.10. Booting the openfiler Guest with xm create.

[root@dom0]# xm create -c op none for none enfiler Using config file "/etc/xen/openfiler".. After the image boots you sh ould see a message and login similar to the one shown in Listing 5.11 . Notice the https (not ht given to actually use the Openfiler appliance.

Listing 5.11. Message and Login Prompt after Successful Boot of Disk Image.

Openfiler NAS/SAN Appliance none for none Powered by rPath Linux To administer this appliance, please use a web browser from another system to navigate to https://128.153.18.

122:446/ For further information and commercial support, please visit http://www.openfiler.com localhost login:.

After accepting the certific ate and agreeing to the GNU public license version 2 (GPLv2), the Openfiler login page appears, a. Figure 5.3. Going to the htt none none ps address that precedes the login prompt, accepting the certificate, and agreeing to displays the Openfiler Web login page.

. [View full size image]. Pygrub can also work equally none for none well with a partition image, again with the requirement that the kernel is found within the ima. configuration file is set up correctly. The only change you should make is with the disk configuration parameter. Instead of e exporting a partition, so you should export xvda1 instead of xvda .

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