class AppKernel extends Kernel {

    public function registerBundles() {

        $bundles = [

            // [...] //

            new GollumSF\CoreBundle\GollumSFCacheBundle(),

            // [...] // 
        }
    }
}

$cache = $container->get('gsf_cache.cache')
$cache->set('key', 'Hello World');
echo $cache->get('key'); // Display: Hello World