Centos Upgrade 4.x to 5.x

To create a CentOS 5 minimal template from centos-4-i386-minimal, follow these steps:

1 - Create a container using centos-4-i386-minimal and set a valid nameserver

vzctl create CTID --ostemplate centos-4-i386-minimal --config CONFIG_TEMPLATE --ipadd container_IP --hostname temp
vzctl set CTID --nameserver NAMESERVER_IP --save

2 - Enter in container

vzctl enter CTID

3 - Install centos-5-release packages

rpm -Uvh http://mirror.centos.org/centos/5.0/os/i386/CentOS/centos-release-notes-5.0.0-2.i386.rpm
rpm -Uvh http://mirror.centos.org/centos/5.0/os/i386/CentOS/centos-release-5-0.0.el5.centos.2.i386.rpm

Note: centos-release-5 depends on notes-package, start with that one.

4 - Backup your /dev/, since initscripts need udev and will remove vzdev you'll net the backup

tar -cf dev.tar ./dev

5 - Install initscripts package (forced and with no deps)

rpm -Uvh http://mirror.centos.org/centos/5.0/os/i386/CentOS/initscripts-8.45.14.EL-1.el5.centos.1.i386.rpm --force --nodeps

6 - Exit from container

exit

7 - Upgrade container packages using vzyum (32bit only)

vzyum CTID upgrade

Note: on 64-bit yum db-version might complain. Do "rm /vz/root/VZNUM/var/lib/rpm/__*" to delete conflicting DB.

8 - Stop your VE

vzctl stop CTID

9 - Replace the new /dev/ with the old one

cd /vz/private/CTID
rm -rf dev
tar -xvf dev.tar

10 - Leave the container private dir (or it will not stard)

cd

11 - Start the container

vzctl start CTID

12 - Remove container IP

vzctl set --ipdel container_IP

13 - Stop container

vzctl stop CTID

14 - Create the template

cd /vz/private/CTID
tar -zcf /vz/template/cache/centos-5.0-i386-minimal.tar.gz .