Connecting CI to TWO different DB on localhost

Sadly this does not work. It gives an error: Message: mysqli::real_connect(): (HY000/2005): Unknown MySQL server host 'localhost:/var/run/mysqld/mysqld.sock' (2)

Funny enough even if I uncomment the loader for db1, it still tries to access db1 and mysql.sock and not mysql2.sock... why?

here is the beginning of my model

PHP Code:

   function __construct()
    {
        // Call the Model constructor
        parent::__construct();

        $this->db1 = $this->load->database('db1', TRUE);
        $this->db2 = $this->load->database('db2', TRUE);
    } 


my full database.php

PHP Code:

$active_group = 'db1';
$query_builder = TRUE;

$db['db1'] = array(
        'dsn'   => '',
        'hostname' => 'localhost:/var/run/mysqld/mysqld.sock',
        'port'     => '3306',
        'username' => '***',
        'password' => '***',
        'database' => 'db',
        'dbdriver' => 'mysqli',
        'dbprefix' => '',
        'pconnect' => FALSE,
        'db_debug' => TRUE,
        'cache_on' => FALSE,
        'cachedir' => '',
        'char_set' => 'utf8',
        'dbcollat' => 'utf8_general_ci',
        'swap_pre' => '',
        'autoinit' => TRUE,
        'encrypt' => FALSE,
        'compress' => FALSE,
        'stricton' => FALSE,
        'failover' => array(),
        'save_queries' => TRUE
);

$db['db2'] = array(
        'dsn'   => '',
        'hostname' => 'localhost:/var/run/mysqld/mysqld2.sock',
        'port'     => '3307',
        'username' => '***',
        'password' => '***',
        'database' => 'db',
        'dbdriver' => 'mysqli',
        'dbprefix' => '',
        'pconnect' => FALSE,
        'db_debug' => TRUE,
        'cache_on' => FALSE,
        'cachedir' => '',
        'char_set' => 'utf8',
        'dbcollat' => 'utf8_general_ci',
        'swap_pre' => '',
        'autoinit' => TRUE,
        'encrypt' => FALSE,
        'compress' => FALSE,
        'stricton' => FALSE,
        'failover' => array(),
        'save_queries' => TRUE
); 


The sockets are there

PHP Code:

root@vps:~# ls -la /var/run/mysqld/mysqld*
-rw-rw---- 1 mysql mysql 6 Dec  9 18:36 /var/run/mysqld/mysqld2.pid
srwxrwxrwx 1 mysql mysql 0 Dec  9 18:36 /var/run/mysqld/mysqld2.sock
-rw-rw---- 1 mysql mysql 6 Dec  9 19:05 /var/run/mysqld/mysqld.pid
srwxrwxrwx 1 mysql mysql 0 Dec  9 19:05 /var/run/mysqld/mysqld.sock