Warning: mysql_connect(): Can't connect to MySQL server on 'gs09' (13) in /var/www/html/test_mysql_conn.php on line 6 Error connecting to mysql

<?php
$dbhost = 'gs09';
$dbuser = 'root';
$dbpass = 'wikipasswd';

$conn = mysql_connect($dbhost, $dbuser, $dbpass) or die
        ('Error connecting to mysql');

$dbname = 'mysql';
mysql_select_db($dbname);
?>