php访问mysql出错

My php connect: 
$host = "192.168.1.197"; 
$user = "root"; 
$pass = "rootpassword"; 
$database = "sample1"; 
#$con=@mysql_connect("$host","$user","$pass") or die('Error connecting to mysql'); 
$con = mysql_connect("$host", "username", "password") or die(mysql_error()); 
$db="$database"; @mysql_select_db($db, $con);


出现错误：Can't connect to MySQL server on '192.168.1.197' (13)
但是用mysql -h 192.168.1.197 -u root -p可以连接

故障原因：是因为client的selinux在做怪
把selinux关掉，并重启
mysql服务端配置文件my.cnf加上
[client] 
port = 3306 
socket = /var/lib/mysql/mysql.sock
并重启就可以访问了