Virtualization: Configuring GRUB

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Configuring GRUB

GNU Grand Unified Boot Loader (or GRUB) is a program which enables the user to select which installed operating system or kernel to load at system boot time. It also allows the user to pass arguments to the kernel. The GRUB configuration file (located in /boot/grub/grub.conf) is used to create a list of operating systems to boot in GRUB's menu interface. When you install the kernel-xen RPM, a post script adds kernel-xen entries to the GRUB configuration file. You can edit the grub.conf file and enable the following GRUB parameter:

title Red Hat Enterprise Linux Server (2.6.18-3.el5xen)

root   (hd0; 0)

kernel  /xen.gz.-2.6.18-3.el5

module  /vmlinuz-2.6..18-3.el5xen ro root=/dev/VolGroup00/LogVol00  rhgb quiet

module  /initrd-2.6.18-3. el5xenxen.img

If you set your Linux grub entries to reflect this example, the boot loader loads the hypervisor, initrd image, and Linux kernel. Since the kernel entry is on top of the other entries, the kernel loads into memory first. The boot loader sends (and recieves) command line arguments to and from the hypervisor and Linux kernel.

This example entry shows how you would restrict the Domain0 linux kernel memory to 800 MB:

title Red Hat Enterprise Linux Server (2.6.18-3.el5xen)

root   (hd0; 0)

kernel  /xen.gz.-2.6.18-3.el5 dom0_mem=800M

module  /vmlinuz-2.6..18-3.el5xen ro root=/dev/VolGroup00/LogVol00  rhgb quiet

module  /initrd-2.6.18-3. el5xenxen.img