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:

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

Enter container

vzctl enter $CTID

Install centos-5-release packages

rpm -Uvh http://mirror.centos.org/centos/5/os/i386/CentOS/centos-release-notes-5.6-0.i386.rpm \
 http://mirror.centos.org/centos/5/os/i386/CentOS/centos-release-5-6.el5.centos.i386.rpm

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

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

tar -cf dev.tar ./dev

Install initscripts package (forced and with no deps)

rpm -Uvh http://mirror.centos.org/centos/5/os/i386/CentOS/initscripts-8.45.33-1.el5.centos.i386.rpm --force --nodeps

Note: If the "transfer failed", go to the CentOS5 mirror and find the latest initscripts rpm and use that instead.

Exit from container

exit

Update conf file

Edit /etc/vz/conf/$CSID.conf and replace

OSTEMPLATE="centos-4-i386-minimal"

with

OSTEMPLATE="centos-5-i386-minimal"

Alternatively, use the 'sed' command to replace it:

sed -i 's#OSTEMPLATE="centos-4#OSTEMPLATE="centos-5#g' /etc/vz/conf/$CSID.conf

Copy existing template from

/vz/template/centos/4

to

/vz/template/centos/5

Upgrade container packages using vzyum (32bit only)

vzyum $CTID upgrade

Note: If yum db-version complains do "rm /vz/root/VZNUM/var/lib/rpm/__*" to delete conflicting db.

Stop your VE

vzctl stop $CTID

Replace the new /dev/ with the old one

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

Leave the container private dir (or it will not start)

cd

Start the container

vzctl start $CTID

Remove container IP

vzctl set $CTID --ipdel all --save

Stop container

vzctl stop $CTID

Create the template

cd /vz/private/$CTID
tar --numeric-owner -zcf /vz/template/cache/centos-5.5-i386-minimal.tar.gz .