Drupal database settings for using on Amazon Web Services (AWS) environment with Amazon RDS and Amazon EC2.

settings.php

<?php

$databases = array (
  'default' =>
  array (
    'default' =>
    array (
      'database' => $_SERVER['RDS_DB_NAME'],
      'username' => $_SERVER['RDS_USERNAME'],
      'password' => $_SERVER['RDS_PASSWORD'],
      'host' => $_SERVER['RDS_HOSTNAME'],
      'port' => $_SERVER['RDS_PORT'],
      'driver' => 'mysql',
      'prefix' => '',
    ),
  ),
);