What is VPS ?

Written by Jahangir on September 17, 2008 – 1:39 am -

A Virtual Private Server or Virtual Dedicated Server (VPS or VDS) is a method of partitioning a physical server into multiple servers such that each VPS has the appearance and capabilities of running on its own dedicated machine. Each virtual server account have its own operating system, can rebooted independently and have root access, users, IP addresses, memory, processes, files, applications, system libraries and configuration files. It fills the gap between shared hosting and dedicated hosting.

There are two kinds of virtualizations: software based and hardware based.
In a software based virtualization environment, the virtual machines share the same kernel and actually require the main node’s resources. This kind of virtualization normally has many benefits in a web hosting environment because of quota incrementing and decrementing in real time with no need to restart the node. The main examples are Virtuozzo, HyperVM, OpenVZ and Xen which is the core kernel of both Virtuozzo and HyperVM.

In a hardware based virtualization, the virtualization mechanism partitions the real hardware resources. In typical implementations, no burst or realtime quota modification is possible; the limits are hard and can only be modified by restarting a virtual machine instance. This kind of environment is potentially more secure in the sense that it is less subject to “Quality of Service crosstalk” between VM instances; on the other hand, its security is typically dependent on the correctness of a larger and more complicated Trusted Computing Base. It is more commonly used in big originations or commercial deployments. Examples include VMware ESX Server, Microsoft Virtual Server and Xen.

Virtual Private Server Hosting

A growing number of companies offer Virtual Private Server Hosting or Virtual Dedicated Server Hosting as an extension for Web hosting services. Some web hosting companies call a Virtual Private Server [VPS], Virtual Dedicated Server [VDS] or Virtual Dynamic Dedicated Server.

These types of hosting accounts are usually used as a stepping stone between your basic shared hosting accounts and dedicated hosting accounts. VPS server provides the flexibility of a dedicated server, users shares the system resources, such as the CPU and memory but unlike shared hosting (a virtual host on a shared hardware server) the file system is fully partitioned. Which provides more up-time and more consistenticy, also root access to the server provides the flexibility to add and change modules and to install your own software’s. You get all of the benefits of having your own dedicated machine, but you still have some limitation as to what you can do with it.

VPS is a much needed plan in between your shared and dedicated hosting. It allows you a little more flexibility than a shared hosting account, but limits you more than a dedicated account.


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