OPENVZ

root@vps1:/# /etc/init.d/apache2 restart
Restarting web server: apache2apache2: Could not reliably determine the server's fully qualified domain name, using 109.95.211.156 for ServerName
... waiting apache2: Could not reliably determine the server's fully qualified domain name, using (тут ип пишется) for ServerName

Как можно исправить ошибку?

Причем тут Openvz я не понял?
На счет ошибки - укажи в httpd.conf NameVirtualHost и ServerName
Например

NameVirtualHost localhost
ServerName localhost