This process (with minor modification) also works to migrate existing Arch installations between various environments and has been confirmed to work in migrating from OpenVZ to Xen and from Xen to OpenVZ. For an install to Xen, other hardware-virtualized platforms, or even to physical hardware, extra steps (basically running mkinitcpio and installing a boot loader) are needed.
It all starts with a dedicated server (a.k.a. a bare-metal server). Instead of using it as a dedicated server or dividing it into hundreds of shared accounts, a server owner decides to turn it into dozens of smaller servers (here comes a difference between shared and VPS hosting - with shared hosting you get an ‘account’, while with VPS you get a ‘server’). In order to divide a bare-metal server into several virtual machines (i.e. in order to virtualize a server), we need to install software called hypervisor.
Ubuntu is one of the most popular desktop Linux distributions which also has a web server variant as well as the Kubuntu package. Overall, Ubuntu, Debian, and Red Hat Enterprise Linux (RHEL) are commonly found in web hosting and private cloud data centers in use as web servers, with Fedora and openSUSE more popular among independent web developers and PHP/Python programmers.
"Root" gives you administrative level access to edit, install and configure all of the files on your server, including system-critical files. It gives you ultimate access to your server. This gives you the ability to configure your server to your exact needs. While root access gives you full control of your server, it is intended for experienced users, engineers and developers. That's because you do have the potential to misconfigure or delete those system critial files if you're unfamiliar or inexperienced with what you're doing.
In answering this question, maybe it’s better to examine how VPS hosting fits in to the overall offerings of most hosting companies. Shared hosting is just that – your site is hosted on a machine with a bunch of other sites, and each of you share the same resources, including RAM, disk space, and CPU. Your site uses what it needs if it’s available, and if it’s not – well, that’s the limitation of shared hosting. Likewise, a dedicated server is also self-explanatory – your site is the only one hosted on server, and you have all the aforementioned resources available at your beck and call. Dedicated hosting is therefore for those large sites with big databases and lots of traffic, whereas the limitations of shared hosting’s usually prevent it from housing that kind of site. Dedicated servers are also relatively expensive, while one can get a shared hosting plan for under $10 per month.