Here is a small tutorial to make available your doctrine plugin for all of your projects residing on the shared server.
I have ubuntu 8.04 LTS box. Default symfony installation is located under “/usr/share/php/symfony/”. Locate whatever your installation directory of symfony and type following commands:
do following modifications
Then save that file and create new file “config.php” with the following script
Now doctrine plugin will be available for all of your projects located on same shared server.