Hosting – Point a domain at an IP-address

How to point a domain at an IP-address?
In this example: point the ‘myexample.com’ domain  to the IP-address 12.34.56.789.

REGISTRAR

Go to the CPanel of your registrar, and add two A-Records:

Type Host Value
A Record @ 12.34.56.789
A Record www 12.34.56.789

HOSTING (PROVIDER)

Log in on your hosting provider (using a SSH connection, with, for instance, Putty).

Go to the Apache2 available sites directory:

cd /etc/apache2/sites-available/

Create a file called myexample.com.conf (fill in the name of your site, of course) with the following content:

<VirtualHost *:80>
        # The ServerName directive sets the request scheme, hostname and port that
        # the server uses to identify itself. This is used when creating
        # redirection URLs. In the context of virtual hosts, the ServerName
        # specifies what hostname must appear in the request's Host: header to
        # match this virtual host. For the default virtual host (this file) this
        # value is not decisive as it is used as a last resort host regardless.
        # However, you must set it for any further virtual host explicitly.
        #ServerName www.example.com

        ServerAdmin (email address of the webmaster)
        ServerName myexample.com
        ServerAlias www.myexample.com
        DocumentRoot /var/www/myexample.com/public_html

        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        # For most configuration files from conf-available/, which are
        # enabled or disabled at a global level, it is possible to
        # include a line for only one particular virtual host. For example the
        # following line enables the CGI configuration for this host only
        # after it has been globally disabled with "a2disconf".
        #Include conf-available/serve-cgi-bin.conf
</VirtualHost>

Go to the Apache2 enabled sites directory:

cd /etc/apache2/sites-enabled/

Create a symlink to the file you just created:

ln -s /etc/apache2/sites-available/myexample.com.conf

Start the new virtual host:

sudo a2ensite myexample.com.conf

Restart the web server:

sudo service apache2 restart

Et, voila!

Resource:
https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-virtual-hosts-on-ubuntu-14-04-lts