PDOException (2002)
SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '' (111)

'default'     => 'mysql',
...
'connections' => array(
    'mysql'       => array(
        'driver'        => 'mysql',
        'host'          => 'myrealdb.us-east-1.rds.amazonaws.com',
        'database'      => 'myrealdbname',
        'username'      => 'myrealuser',
        'password'      => 'myrealpass',
        'charset'       => 'utf8',
        'collation'     => 'utf8_unicode_ci',
        'prefix'        => '',
        'database_port' => '3306',
        'unix_socket'   => '',
    ),
    ...
);