$config['sess_driver'] = 'database';
 $config['sess_cookie_name'] = 'ci_sessions';
 $config['sess_cookie_name'] = 'kr_session';
 $config['sess_expiration'] = 7200;
 $config['sess_save_path'] = 'ci_sessions';
 $config['sess_match_ip'] = FALSE;
 $config['sess_time_to_update'] = 300;
 $config['sess_regenerate_destroy'] = TRUE;