Connecting CI to TWO different DB on localhost

Just connect to both depend on your database configuration like that

PHP Code:

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


The same was told in the stackoverflow question but...
This does NOT work, because both server instances are connected to different sockets.

My question was "But how can I get CI to use socket '/var/run/mysqld/mysqld2.sock' for db2 while still using mysql.sock for db1?" Or can I connect to the servers using TCP localhost instead?

Can anyone please help me with a solution for that?