User`s guide

Along with upgrading the Parallels Virtuozzo Containers software, you may also wish to

upgrade the Host operating system (Host OS) installed on your server. The following table lists

the types of Host OS+Parallels Virtuozzo Containers (both Virtuozzo 3.0 Service Pack 1 and

Parallels Virtuozzo Containers 4.0) upgrades officially supported in Parallels Virtuozzo

Containers 4.6:

Host OS before upgrade Host OS after upgrade

CentOS 4 CentOS 5

Red Hat Enterprise Server 4 CentOS 5

Red Hat Enterprise Server 4 Red Hat Enterprise Server 5

The procedure of upgrading Host OSs slightly differs depending on the Virtuozzo version

installed on the server and is described below.

Upgrading Host Operating Systems with

Parallels Virtuozzo Containers