Virtual Private Servers: Fast Facts

By: JohnXie

At the onset, the physical server boots just like a regular computer or any system. It then runs a program enabling the virtual servers to boot from a disk image on a certain virtual environment. This means that virtual servers do not actually have direct access to the hardware.

VPS can be classified into two bases: software and hardware. In Software-based virtualization, the virtual machines share the same language and require the main system's resources. This is mostly used in a web hosting facility because of the changes in real time, thus no need to restart its source. Examples of which include Xen and OpenVZ. Hardware-based virtualization however, involves the physical partitioning of resources where real time quota changes are impossible. Modifications would require restarting its virtual machine. VMware ESX Server and Microsoft Virtual Server are examples of this.
Virtual private servers (VPS) bridge the gap between dedicated hosting service and shared web hosting. VPS makes it possible for clients to independently work on the service in terms of software at a lesser expense. Customers can actually access the operating system and install programs while the VPS has its own copy of the system's processes. However, there might be restrictions imposed by some VPS providers. This may include antivirus clients, firewalls and other software that is required based on its virtual environment. Generally, virtual private servers are subjected to limited disk space, processor time, and random access memory. Shared hosting environments are actually more rigid than that of dedicated VPS hosting.

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VPS could act either as sandboxes or as honeypots. As sandboxes, virtual private servers can run in this process - two virtual servers on one physical server - such that one server hosts a live website while the other creates the copy of it. Updates, tests and other modifications can be done on the alternate server without the need for different physical servers. As honeypots, VPS allows the system to run softwares that could possibly contain bug and eventually deploy a number of private virtual private servers as it is easier to track computer security on a single computer even with multiple private servers.

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