How i can make separate domain for each site

@beginner

Are you trying to set this up on a Droplet through DigitalOcean or on your local Windows PC? If you are looking to setup a LAMP stack on a Droplet, you really don’t need VirtualBox as Apache will be able to handle as many domains as you need while providing the ability to use your domains.

I would recommend looking over the following tutorial. It’s for Fedora, though you could just as easily replace Fedora with CentOS as things are ultimately similar and the commands should not differ.

https://www.digitalocean.com/community/tutorials/how-to-install-lamp-linux-apache-mysql-php-on-fedora-22

I must use centOS and virtual box.

I’m using NginX, but the principles are the same in that “beginner” needs to set up virtual hosts for the web server. That Fedora link isn’t sufficient information. I do agree that setting up virutal box is a weird approach, assuming “beginner” is trying to take one droplet and create two virtual servers. Apache and NginX can keep the websites isolated, though they will share the same IP address.

I’m using FreeBSD, so I can’t be of much more help, (Well providing people think I helped at all. ;-)) Here is a google hit regading virutal hosts, but obviously untested by me.

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

Doing a quick scan of the article, I don’t a mention of DNS, but obviously you have to set up DNS for each domain, even if the actual IP is the same.