Grant McWilliams

Tech Virtualization Xen Howtos Install Xen 3.4 on CentOS 5 (32 bit) the easy way

Install Xen 3.4 on CentOS 5 (32 bit) the easy way

 

1. First we need to add the YUM repository holding the updated Xen. You will need to be logged in as root to carry out these instructions

 

wget http://www.gitco.de/linux/i386/centos/5/CentOS-GITCO.repo -O /etc/yum.repos.d/CentOS-GITCO.repo

2. Uninstall and reinstall the Virtualization group

yum groupremove Virtualization
yum update
yum clean all
yum groupinstall -y Virtualization

 

Warning! If you get an error message from grubby this is bad!

Installing: kernel-xen                   ####################### [ 9/13]
grubby fatal error: unable to find a suitable template

This means that your grub.conf file couldn't be written to for whaterver reason. I'm not sure yet why this is happening but it basically means the grub.conf will be pointing to your old xen-kernel instead of your new one so you won't be able to successfully reboot. If you get this message you need to edit your /boot/grub/grub.conf file and make the kernel lines match the kernel you installed. To get your installed xen-kernel version check it with rpm.

[ root@vs / ] rpm -q kernel-xen

kernel-xen-2.6.18-92.1.6.el5

Now edit your /boot/grub/grub.conf to match


# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/vgsys/lvroot
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-92.1.6.el5xen)
root (hd0,0)
kernel /xen.gz-3.3.0
module /vmlinuz-2.6.18-92.1.6.el5xen ro root=/dev/vgsys/lvroot rhgb quiet
module /initrd-2.6.18-92.1.6.el5xen.img

4. Reboot - no really I mean it.

5. Try it out by using the xm dmesg command

[ root@vs ~ ] xm dmesg
__  __            _____ _  _    ___  
\ \/ /___ _ __   |___ /| || |  / _ \
\  // _ \ '_ \    |_ \| || |_| | | |
/  \  __/ | | |  ___) |__   _| |_| |
/_/\_\___|_| |_| |____(_) |_|(_)___/

(XEN) Xen version 3.4.0 (This email address is being protected from spambots. You need JavaScript enabled to view it.) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)) Fri May 29 21:39:26 CEST 2009

That's about all. If you have any questions drop a comment here.

Tech Virtualization Xen Howtos Install Xen 3.4 on CentOS 5 (32 bit) the easy way