Virtuozzo / Linux Reference
Migrating Templates
One nice feature VZ offers is the ability to run a virtual environment (VE or CT as it's now called) based on a particular ditribution on a host which may or may not share the same distribution. For instance, you could run a CT running Ubuntu while the host machine (Hardware Node or HN) is running CentOS. This is accomplished via the use of OS templates. As long as the HN contains the OS template on which a particular CT relies, it will run there. As such, if you want to move a VE from one HN to another, you will need to make sure the OS template exists there.
Modern versions of VZ (>= 4.x) will check for and automatically move the OS template over to the host as you're (vz)migrating the CT over to a new HN. However we like to make sure the template is in place prior to moving the CT.
The first step is to see if the template exists on the host. To see OS templates installed:
2.x (shows OS and application templates):
# vzpkgls mod_ssl-rh9 20040624 mysql-rh9 20030814 20050412 openwebmail-rh9 20050427 php-rh9 20050506 phpBB-rh9 20041229 postgresql-rh9 20050719 sl-webalizer-rh9 20040119 spamassassin-rh9 20040127 tomcat-rh9 20040524 usermin-rh9 20040116
>= 3.x (shows just OS templates, run without -O to see application as well):
# vzpkg list -O ubuntu-10.04-x86 2010-06-01 11:39:05 ubuntu-11.04-x86 2011-06-22 14:23:59 ubuntu-9.10-x86 2010-03-11 17:39:51 centos-5-x86 2010-03-11 17:12:27 debian-5.0-x86 2010-03-11 17:33:34
To get a template from one HN to another, it simply needs to be rsync'd over to the target HN. All templates are located in /vz/template:
# ls /vz/template/ ColdFusion-fc1 jre-fc1 openwebmail-fc1 sl-webalizer-fc1 ColdFusion-fc2 jre-fc2 openwebmail-fc2 sl-webalizer-fc2 ColdFusion-rh9 jre-rh9 openwebmail-rh9 sl-webalizer-rh9 PostNuke-fc1 jre-suse92 openwebmail-suse92 spamassassin-fc1 PostNuke-fc2 jrun php-deb31 spamassassin-fc2 PostNuke-rh9 mailman-deb31 php-fc1 spamassassin-rh9 analog-fc1 mailman-fc1 php-fc2 spamassassin-suse92 analog-fc2 mailman-fc2 php-rh9 suse-9.2 analog-rh9 mailman-rh9 php-suse92 tomcat-fc1 awstats-fc1 mailman-suse92 phpBB-fc1 tomcat-fc2 awstats-rh9 mod_frontpage-fc1 phpBB-fc2 tomcat-rh9 bbClone-fc1 mod_frontpage-fc2 phpBB-rh9 tomcat-suse92 bbClone-fc2 mod_frontpage-rh9 phpmyadmin-deb31 urchin-fc1 bbClone-rh9 mod_frontpage-suse92 postgresql-deb31 usermin-fc1 conf mod_perl-deb31 postgresql-fc1 usermin-fc2 debian-3.1 mod_perl-fc1 postgresql-fc2 usermin-rh9 devel-deb31 mod_perl-fc2 postgresql-rh9 uw-imap-fc1 devel-fc2 mod_perl-rh9 postgresql-suse92 uw-imap-fc2 devel-suse92 mod_perl-suse92 proftpd-deb31 uw-imap-rh9 fedora-core-1 mod_ssl-fc1 proftpd-fc1 vzredhat-7.3 fedora-core-2 mod_ssl-fc2 proftpd-fc2 vzredhat-8.0 jdk-deb31 mod_ssl-rh9 proftpd-rh9 webalizer-suse92 jdk-fc1 mysql-deb31 proftpd-suse92 webmin-fc1 jdk-fc2 mysql-fc1 redhat-7.2 webmin-fc2 jdk-rh9 mysql-fc2 redhat-9 webmin-rh9 jdk-suse92 mysql-rh9 redhat-as3-minimal jre-deb31 mysql-suse92 redhat-devel-9
What we see here are the base OS templates: redhat-9, fedora-core-1 and supporting application templates: postgresql-rh9, mailman-rh9, jdk-fc1, mod_ssl-fc1. So if you wanted to copy over all of redhat 9 you'd need to copy the contents of:
# ls -d /vz/template/*rh9* /vz/template/ColdFusion-rh9 /vz/template/mod_frontpage-rh9 /vz/template/proftpd-rh9 /vz/template/PostNuke-rh9 /vz/template/mod_perl-rh9 /vz/template/sl-webalizer-rh9 /vz/template/analog-rh9 /vz/template/mod_ssl-rh9 /vz/template/spamassassin-rh9 /vz/template/awstats-rh9 /vz/template/mysql-rh9 /vz/template/tomcat-rh9 /vz/template/bbClone-rh9 /vz/template/openwebmail-rh9 /vz/template/usermin-rh9 /vz/template/jdk-rh9 /vz/template/php-rh9 /vz/template/uw-imap-rh9 /vz/template/jre-rh9 /vz/template/phpBB-rh9 /vz/template/webmin-rh9 /vz/template/mailman-rh9 /vz/template/postgresql-rh9 # ls -d /vz/template/*redhat-9* /vz/template/redhat-9
It's rsync'd over in this fashion:
rsync -av /vz/template/
If the template doesn't exist on the target, this is very simple.