Gonzalo Ayuso has a second post in his series looking at using the Symfony2 dependency injection container with Doctrine functionality. In his previous post he talked about sharing PDO connections via the DIC. In this latest one it's focused on the sharing of DBALs from Doctrine.
OK. We can handle PDOs connections inside a Symfony2 application, but what happens if we prefer DBAL. As we know DBAL is built over PDO and adds a set of "extra" features to our database connection. It's something like PDO with steroids.
He includes the (PHP) configuration to set up the DBAL and the YAML definition to set it up in the DIC's configuration. As an update to the post, he also points out a bundle for Symfony2 that lets Doctrine do this natively - check out this documentation on github.