Domain won't open with www?

Question

Nginx

Good day to all!
Finally moved my site to vps. And everything would be fine, but the domain c www does not open, and without www everything plows.
I tried to prescribe redirects in htaccess, apache and nginx - the effect is zero whole horseradish tenths. In general, as one of the Pilot brothers used to say: “I don’t understand anything ...”.
What could be the problem? Maybe the syntax is wrong? or something with DNS?

Answer 1

In general, it was necessary to register CNAME and set up a redirect. Earned.
Thanks chemik .

Answer 2

You redirect yourself to a domain for which there is no config.

server {
    server_name  www.jablog.ru;
    rewrite ^(.*) http://jablog.ru$1 permanent;
}

server {
    server_name jablog.ru;
    #остальной конфиг#
}