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Centos Upgrade 4.x to 5.x

Revision as of 22:25, 2 June 2011 by Hm2k (talk | contribs) (improved tar based backup/restore)
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To create a CentOS 5 minimal template from centos-4-i386-minimal, follow these steps:

Contents

Create the containerEdit

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


Install centos-5-release packagesEdit

Use vzctl exec to execute the rpm install command on the container: 

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

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

Backup devEdit

Backup the container /dev/ directory, as initscripts needs udev and will remove vzdev you'll need the backup: 

tar -cf $CTID.dev.tar -C /vz/private/$CTID dev

Install initscripts packageEdit

Install initscripts package (forced and with no deps), as per below: 

vzctl exec $CTID 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.

Update conf fileEdit

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/$CTID.conf

Copy existing templateEdit

Copy existing template from: 

/vz/template/centos/4

to 

/vz/template/centos/5

Update yum.confEdit

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

Using sed: 

sed -i 's#centos4#centos5#g' /vz/template/centos/5/i386/config/yum.conf
sed -i 's#CentOS 4#CentOS 5#g' /vz/template/centos/5/i386/config/yum.conf
sed -i 's#centos/4/#centos/5/#g' /vz/template/centos/5/i386/config/yum.conf

Upgrade container packagesEdit

db-version will complain, so delete the conflicting database first: 

rm -fr /vz/root/$CTID/var/lib/rpm/__*

Now run vzyum to upgrade the contain packages: 

vzyum $CTID upgrade

TroubleshootingEdit

If you get this error: 

Error: Missing Dependency: python-abi = 2.3 is needed by package python-elementtree

and/or 

warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897
Public key for libsepol-1.15.2-3.el5.i386.rpm is not installed

You need to run the following before trying again: 

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

Test your VEEdit

Check you can enter your VE: 

vzctl enter $CTID

All went OK? Exit the VE: 

exit

TroubleshootingEdit

Unable to open pty: No such file or directory

If you see errors like this, see the VPS_enter_failed article.

Stop your VEEdit

vzctl stop $CTID

Restore devEdit

This will replace the new /dev/ with the old one: 

mv /vz/private/$CTID/dev /vz/private/$CTID/dev.old
tar -xvf $CTID.dev.tar -C /vz/private/$CTID

Remove container IPEdit

vzctl set $CTID --ipdel all --save

Create the templateEdit

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