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25.9. Modifying the hypervisor(dom0)

Managing host systems often involves changing the boot configuration file /boot/grub/grub.conf. Managing several or more hosts configuration files quickly becomes difficult. System administrators often prefer to use the 'cut and paste' method for editing multiple grub.conf files. If you do this, ensure you include all five lines in the Virtualization entry (or this will create system errors). Hypervisor specific values are all found on the 'xen' line. This example represents a correct grub.conf virtualization entry:
# boot=/dev/sda/
#splashimage=(hd0, 0)/grub/splash.xpm.gz

serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
terminal --timeout=10 serial console
title Red Hat Enterprise Linux Server (2.6.17-1.2519.4.21. el5xen)
root (hd0, 0)
kernel /xen.gz-2.6.17-1.2519.4.21.el5 com1=115200,8n1
module /vmlinuz-2.6.17-1.2519.4.21el5xen ro root=/dev/VolGroup00/LogVol00
module /initrd-2.6.17-1.2519.4.21.el5xen.img
For example, to change the memory entry on your hypervisor(dom0) to 256MB at boot time, edit the 'xen' line and append it with this entry: 'dom0_mem=256M'. This example a modified grub.conf with the hypervisor's memory entry modified.
# boot=/dev/sda
serial --unit=0 --speed =115200 --word=8 --parity=no --stop=1
terminal --timeout=10 serial console
title Red Hat Enterprise Linux Server (2.6.17-1.2519.4.21. el5xen)
root (hd0,0)
kernel /xen.gz-2.6.17-1.2519.4.21.el5 com1=115200,8n1 dom0_mem=256MB
module /vmlinuz-2.6.17-1.2519.4.21.el5xen ro
module /initrd-2.6.17-1.2519.4.21.el5xen.img

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