This was my experience with upgrading, your mileage may vary especially
if it's in kilometers. This is what I had to do to get my system
running again.
##############
In order to attempt this upgrade, I had to use "linux upgradeany", a
mode not listed for the installer CDs.
My first problem was I could no longer boot the system after the
upgrade. My grub menu showed my old FC2 kernel, Fedora Core
(2.6.10-1.14_FC2), but not the kernel for Centos. Trying to boot this
FC2 kernel it froze after "Enabling swap space:"
* Boot up the "linux rescue", chroot /mnt/sysimage
* used lynx to download kernel-2.6.9-5.EL.i686.rpm
* rpm -ivh kernel-2.6.9-5.EL.i686.rpm
warning: kernel-2.6.9-5.EL.i686.rpm: V3 DSA signature: NOKEY, key ID
4fe06303
error: failed to stat /dev/shm: No such file or directory
Preparing...
##################################################
package kernel-2.6.10-1.14_FC2 (which is newer than
kernel-2.6.9-5.EL) is already installed
* rpm -ivh --old-package kernel-2.6.9-5.EL.i686.rpm
warning: kernel-2.6.9-5.EL.i686.rpm: V3 DSA signature: NOKEY, key ID
4fe06303
error: failed to stat /dev/shm: No such file or directory
Preparing...
##################################################
error: %pre(kernel-2.6.9-5.EL.i686) scriptlet failed, exit status 255
error: install: %pre scriptlet failed (2), skipping kernel-2.6.9-5.EL
* rpm2cpio kernel-2.6.9-5.EL.i686.rpm | cpio -i --make-directories
* mv boot/* /boot/
* mv lib/modules/* /lib/modules/
* depmod -a
* mkinitrd /boot/initrd-2.6.9-5.EL 2.6.9-5.EL
* edit /etc/grub.conf an add in this kernel
* rebooted into the Centos-4 system at this point
just need to do some finishing work to get things started
* fedora-release-2-4.i386 wasn't upgraded to centos-release
* yum wouldn't run as the fedora release version was 2
cp /etc/yum.conf /etc/yum.conf.old
cp /etc/yum.conf.rpmnew /etc/yum.conf
wget
http://beta.centos.org/centos/4.0beta/os/i386/CentOS/RPMS/centos-release-4.0beta-5.i386.rpm
rpm -e --nodeps fedora-release
rpm -ivh centos-release-4.0beta-5.i386.rpm
rpm --import /usr/share/rhn/RPM-GPG-KEY-centos4.0beta
yum clean all
rpm -e --nodeps $(rpm -qa | grep kernel | grep FC2)
yum install kernel (or rpm -ivh kernel-2.6.9-5.EL.i686.rpm)
yum update
-Mike
