Drupal 8 (from beta 16) enable file configuration before install

drupal8_beta_16_file_configuration.md

At this moment ( 8.0.0-beta16 ) to switch to file configuration before install Drupal:

Into settings.php Uncomment

    $settings['bootstrap_config_storage'] = array('Drupal\Core\Config\BootstrapConfigStorageFactory', 'getFileStorage');

then add:

    $config_directories = array(
      CONFIG_ACTIVE_DIRECTORY => 'PATH_OUTSIDE_WEB_ROOT/config/active/',
      CONFIG_STAGING_DIRECTORY => 'PATH_OUTSIDE_WEB_ROOT/config/staging/',
    );

In sites/default/services.yml add:

    services:
      config.storage:
        class: Drupal\Core\Config\CachedStorage
        arguments: ['@config.storage.active', '@cache.config']
      config.storage.active:
        class: Drupal\Core\Config\FileStorage
        factory: Drupal\Core\Config\FileStorageFactory::getActive