= How to Install Quattor with SCDB =
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== Subversion Server ==

There is no need for a Subversion server dedicated to Quattor. SCDB is just one repository from the Subversion point of view. If you already run a Subversion server, you can skip the installation part and go directly to the configuration part.

=== Subversion installation ===

There are many possible installation options for a Subversion server. The best is to install it as Apache module, anyway. There is no requirement for the Subversion server to run on a Linux machine, even if it is the installation option documented here. You can even choose to use a Subversion server outside of your site, if you think the network connection is good enough.

If you need to install a Subversion server, the easiest is to install Apache and then retrieve the RPMs for Subversion from [http://subversion.tigris.org/project_packages.html Subversion site]. Don't forget to install the Apache module which is in a separate RPM.

After installing, you have to configure the Subversion server. Look at Quattor installation guide on [http://quattor.org Quattor] web site.

=== Repository configuration ===

For Quattor, you need to create a repository with the standard structure inside it (or inside a branch) :
 * `trunk` : where you make the changes to your running configuration
 * `tags` : used by SCDB administration tool to do deployment
 * `branches` : for alternative developments


== Quattor Server ==

In addition to the base system installation, you need to install the following RPMs on a Quattor server where you want to use SCDB :

 * Java VM > 1.5.0
 * Subversion client
 * PAN compiler
 * cdb-sync
 * ncm-template
 * aii-server

All but Java and SVN client can be download from http://quattorsrv.lal.in2p3.fr/packages/quattor/sl-i386. Always use the last version, unless explicitly mentionned.

== SCDB Initialization ==

To start with SCDB, you first need to install a [http://subversion.tigris.org Subversion] server, an open source product. There are in fact 2 versions of Subversion server :
 * http based : it is provided as an Apache module. This is the recommended version for production but is a litte bit more complex to setup than standalone version.
 * standalone version : this should be used for testing, as it has less features than http based version.

There is no problem to start with standalone server and migrate to http server later (just the repository URL will change and it will require a new checkout) : repository are the same whatever the access method is.

After you have a Subversion server installed, you need to :
 * Create a repository or a branch in an existing repository where SCDB will be stored
 * Checkout this repository/branch (`svn co`)
 * Import the basic SCDB structure from [source:SCDB].
 * Import QWG templates in `cfg` directory, according to the version you need. See QWG [wiki:Download download] instructions.

A tool originally written for QWG templates developpers, [source:templates/trunk/tools/check-compile.sh check-compile.sh], simplifies the two last steps (import of standard templates), executing both operations and compiling examples. Use option `-h` to get the list of available options. A typical use of this tool (replace the release tag `gLite-3.0.2-1` by the QWG templates release you want to download) is :
{{{
check-compile.sh -d your_scdb_dir /templates/tags/gLite-3.0.2-1
}}}


== Site Configuration ==

Java version 1.5 is needed to run the ant build script.

=== RPM Repositories ===

=== Middleware Configuration ===

== Cluster Configuration ==


== Quattor Server Final configuration ==

Before being able to deploy the created configuration, there is a last configuration step needed to allow deployment of the configuration after successful compilation. This involves :

 * Adding a hook script to the Subversion repository to trigger the deployment
 * Adding a script on the Quattor server that will be launched by the hook script, using ssh
 * Configuring SSH keys to allow execution of the previous script as root (preferably) from the Apache account
 * Add a CGI script on Quattor web server used at end of installation of a machine to allow next boot from local disk.

=== Installation of hook script and server script ===

The hook script, `post-commit`, is provided as part of SCDB, in the `src/hooks` directory. It must be installed on your Subversion server, in the `hook` directory of the repository, and given executable permission for Apache user.

The other script, `build-tag.pl`, also provided as part of SCDB, in the `src/hooks` directory, must be installed (root executable) in `/root/quattor` on the Quattor server.