Centos Upgrade 4.x to 5.x

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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/os/i386/CentOS/initscripts-8.45.30-2.el5.centos.i386.rpm --force --nodeps

6 - Exit from container 

exit

7 - In /etc/vz/conf/CSID.conf replace 

OSTEMPLATE="centos-4-i386-minimal"

to 

OSTEMPLATE="centos-5-i386-minimal"

8 - Coppy existing template from 

/vz/template/centos/4

to 

/vz/template/centos/5

9 - In /vz/template/centos/4/i386/config/yum.conf change mirrors to CentOS 5

10 - 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.

11 - Stop your VE 

vzctl stop CTID

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

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

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

cd

14 - Start the container 

vzctl start CTID

15 - Remove container IP 

vzctl set --ipdel container_IP

16 - Stop container 

vzctl stop CTID

17 - Create the template 

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