[web server] How to set up domain redirects from www.examle.com to examle.com?

Question

Web servers

We have installed and almost successfully use the server on Zentyal. It contains several sites. When binding new domains to the server, only domains without www (examle.com) are correctly addressed. When typing a domain from www (www.example.com), it addresses the first domain entered. In this case, if the first domain is entered from www, then it works fine.
Redirect via *.htaccess, access to the first site is lost.
Redirecting through the index page also breaks access to the first site.
Redirecting through the domain registrar also does not work.
I understand that redirection should be done through Apache?
If possible, please give a link where to smoke

Answer 1

Smoking should be no closer than 15 meters from bus stops.
.htaccess

RewriteEngine   on
Options +FollowSymLinks 
RewriteCond %{HTTP_HOST} ^www\.site\.ru
RewriteRule ^(.*)$ http://site.ru/$1 [R=301,L]