1 - ==Create the container== Create a container using centos-4-i386-minimal and set a valid nameserver :<pre>vzctl create $CTID --ostemplate centos-4-i386-minimal --config CONFIG_TEMPLATE --ipadd container_IP --hostname tempvzctl set $CTID --nameserver NAMESERVER_IP --save</pre>  ==Install centos-5-release packages==Use <code>vzctl exec</code> to execute the rpm install command on the container: <pre>vzctl exec $CTID 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.1.i386.rpm</pre>Note: centos-release-5 depends on notes-package, start with that one. ==Backup dev== Backup the container /dev/ directory, as initscripts needs udev and will remove vzdev you'll need the backup: <pre>tar -cf $CTID.dev.tar -C /vz/private/$CTID dev</pre> ==Install initscripts package== Install initscripts package (forced and with no deps), as per below: 

vzctl create exec $CTID rpm --ostemplate Uvh http://mirror.centos.org/centos/5/os/i386/CentOS/initscripts-48.45.33-1.el5.centos.i386-minimal --config CONFIG_TEMPLATE --ipadd container_IP --hostname tempvzctl set CTID .rpm --nameserver NAMESERVER_IP force --savenodeps

2 - Enter in containerNote: If the "transfer failed", go to the [http://mirror.centos.org/centos/5/os/i386/CentOS/ CentOS5 mirror] and find the latest initscripts rpm and use that instead. ==Update conf file== Edit /etc/vz/conf/$CSID.conf and replace

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

Alternatively, use the 'sed' command to replace it:<pre>sed -i 's#OSTEMPLATE="centos-4#OSTEMPLATE="centos-5#g' /etc/vz/conf/$CTID.conf</pre> ==Copy existing template== Copy existing template from: <pre>/vz/template/centos/4</pre>to<pre>/vz/template/centos/5</pre> ==Update yum.conf== In /vz/template/centos/5/i386/config/yum.conf change mirrors to CentOS 5 Using sed: <pre>sed -i 's#centos4#centos5#g' /vz/template/centos/5/i386/config/yum.confsed -i 's#CentOS 4 #CentOS 5#g' /vz/template/centos/5/i386/config/yum.confsed - Backup your i 's#centos/dev4/#centos/5/#g' /vz/template/centos/5/i386/config/yum.conf</pre> ==Upgrade container packages== db-version will complain, since initscripts need udev and will remove vzdev you'll net so delete the backupconflicting database first:

tar rm -cf dev.tar .fr /devvz/root/$CTID/var/lib/rpm/__*

6 - Exit from container===Troubleshooting=== If you get this error: 

exitError: Missing Dependency: python-abi = 2.3 is needed by package python-elementtree</pre> and/or<pre>warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897Public key for libsepol-1.15.2-3.el5.i386.rpm is not installed

7 - Upgrade container packages using vzyum (32bit only)You need to run the following before trying again: 

vzyum vzctl exec $CTID upgraderpm -e --justdb python-elementtree --nodepsvzctl exec $CTID rpm --import http://mirrors.kernel.org/centos/RPM-GPG-KEY-CentOS-5

8 - Stop ==Test your VE==Check you can enter your VE:

vzctl stop enter $CTID

9 - Replace All went OK? Exit the new /dev/ with the old oneVE:

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

11 - Start If you see errors like this, see the container[[VPS_enter_failed]] article. ==Stop your VE==

vzctl start stop $CTID

12 - Remove container IP==Restore dev== This will replace the new /dev/ with the old one:

vzctl set mv /vz/private/$CTID/dev /vz/private/$CTID/dev.oldtar -xvf $CTID.dev.tar -ipdel container_IPC /vz/private/$CTID

13 - Stop == Remove containerIP ==

vzctl stop set $CTID--ipdel all --save

14 - ==Create the template==

cd /vz/private/$CTIDtar --numeric-owner -zcf /vz/template/cache/centos-5.05-i386-minimal.tar.gz .