Some peoples had asked me for this guide, so I thought it was a good idea to post here. I'm not a pro on things like this so maybe I'll not can help you, btw you can suggest to this guide very helpful informations, I'll be grateful for you.  Introduction I'll teach you guys how to setup a rAthena Server in a Virtual Machine (VM) for training VPS before buying one and enable connection to another peoples for co-working or something using VirtualBox and CentOS 7 as Operating System (OS