Editing OS template metadata

{{Warning|The rest of this document is obsoleted and is kept here for historical purposes only. Template utilities (vzpkg/vzyum) are no longer supported. Use [[Download/template/precreated|precreated templates]].}}

'''OS template metadata''' is a set of a few files containing the following information:

* List of packages that form this [[OS template]]
* Locations of package repositories
* Scripts needed to be executed on various stages of template installation
* Public GPG key(s) needed to check signatures of packages
* Additional OpenVZ-specific packages

Using OS template metadata and vzpkg tools, an OS template cache can be created.
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==Internals==
(Incomplete) Based off the centos-4 vztmpl:

*addons/vzdev is a static list of most commonly used /dev entries. Provides dev package. Uses MAKEDEV.spec
*addons/MAKEDEV-3.3.13-1.3.swsoft is generated from a copy of fedora core 2's MAKEDEV-3.3.13. Uses MAKEDEV.spec which is a customized version to install only the essential devices and depend on vzdev
*dummy-centos-4 is a placeholder for kernel, module-init-tools, modutils, mingetty, kernel-utils, ethtool, and kernel-drm packages. Uses dummy.spec
*default.list, minimal.list, *.list are list of packages for a flavor of the template. Must contain dummy-centos-4, vzdev, and MAKEDEV packages
*config/yum.conf.in template for yum.conf with tokens replaced during build.
*config/install-pre or install-post is executed by cache-os which is executed by vzpkgcache when creating a template cache
*config/update-pre or update-post is executed when updating a template cache
*config/gpgkeys are the keys for the packages to be cached
*config/rpm contains the rpm version
*vztmpl.spec.in is template for the vztmpl package
*make.defs is the common variables for the make process

Download the vztmpl-centos-4*.src.rpm. Install it. Modify it.

To generate the OS template metadata rpm run "make rpms" inside the /usr/src/redhat/SOURCES/centos-4 dir. You will need gcc, rpmbuild, and createrepo packages.

==Contributions==
* http://www.neonhost.com/openvz/ - Centos 5 rpm and patch for centos 4 template contributed by Chris Turan. See http://forum.openvz.org/index.php?t=msg&&th=5037
* http://krnjevic.com/wp/wp-content/uploads/2008/04/vztmpl-centos-5-2.0-3.i386.rpm - newer Centos 5 template (see also http://krnjevic.com/wp/?p=80)
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== See also ==
* [[OS template]]
* [[OS template cache]]
* [[OS template cache preparation]]

[[Category: Definitions]]
[[Category: Templates]]
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