CentOS upgrade from 5.2 to 5.5 (final)

How to upgrade CentOS

#ps auxwww | grep -i yum
#kill -9
Remove any excluded packages by commenting out any exclude=XXXXX lines in /etc/yum.conf
#yum -y upgrade

This will upgrade the kernal as well.

you need to reboot the machine to reflect the new kernel.

If you just want to upgrade the kernel not the OS packages.


#yum upgrade kernel
or
#yum upgrade kernel-smp (4+ gb ram)

when the kernel upgrade completes edit the grub.conf

nano /boot/grub/grub.conf

default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-194.32.1.el5)
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-194.32.1.el5 ro root=LABEL=/ rhgb quiet
initrd /boot/initrd-2.6.18-194.32.1.el5.img
title CentOS (2.6.18-92.1.13.el5)
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-92.1.13.el5 ro root=LABEL=/ rhgb quiet
initrd /boot/initrd-2.6.18-92.1.13.el5.img
title CentOS (2.6.18-92.el5)
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-92.el5 ro root=LABEL=/ rhgb quiet
initrd /boot/initrd-2.6.18-92.el5.img


here point to note
Grub starts at 0, so "default=0".

reboot the machine by
shutdown -r now
or
init 6

When it comes back up run uname -a to make sure it has the new kernel.


If you want to use your old kernel then set "default=1"