Enable mod_rewrite and .htaccess through httpd.conf
and then put this code in your .htaccess
under DOCUMENT_ROOT
directory:
Options +FollowSymLinks -MultiViews
# Turn mod_rewrite on
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^ http://%1%{REQUEST_URI} [R=301,L]
Just one rule like this will take care of removing www
from all of your hosts.