Apache Server How To Redirect To WWW instaed of getting default http://mysite.com

I have an appache server with 20 web sites,
I want them all to be www.mysite.com instead of http://mysite.com

it seems google picks them up as http://mysite.com and picks up the default web site first, is there a way to tell apache not to go to default website,

all parameters in sites-enabled are ok (I hope), all pointing to www.

is there something in the httpd file I should change ?

Forgot someone once told me to ad

RewriteEngine on
RewriteCond %{HTTP_HOST} ^mysite\.com
RewriteRule ^(.*)$ http://www.mysite.com/$1 [R=301,L]


to each web site directory, however , I think my server is bypassing that and going straight to default , only for a few sites, I assume if you dont tell google you want www.mysite.com then they pick out http://mysite.com and then that goes straight to my default site since I indicate www in the sites-enabled configuration.

that code is right , did you put it in a .htaccess file in each site directory?

I will double check, but I suspect that its not even looking in the individual directories and just going to default ?

use this code:

Put the code on the .htaccess of the root directory of every site, eg: public_html

note that using Apache server will make it easy to DDOS your site