How to uninstall Parallels Virtuozzo for Linux

1. stop Virtuozzo services
service vz stop

2. uninstall all Virtuozzo packages
rpm -qa|grep swsoft|grep vz|xargs yum remove -y
rpm -qa|grep swsoft|grep -E "virtu|-ez-|-tmpl-"|xargs yum remove -y

3. remove /vz contents (directories: actionlog, backups, lock, private, root, template, vzup2date)
cd /vz/ && mkdir _before_reinstall && mv * _before_reinstall

4. remove configs from /etc
mkdir -p /vz/_before_reinstall/etc && find /etc -name vz\* -exec mv {} /vz/_before_reinstall/etc \;

5. check /etc/grub.conf if it has a proper configuration (no Virtuozzo kernel, Red Hat kernel is default)

6. check /etc/sysctl.conf for tuned parameters which you might not need

7. reboot the server

Reference: http://forum.parallels.com/showthread.php?t=72613 by Alec@sw