VPS in a nutshell

A virtual dedicated server (also called a virtual server), in English virtual private server (VPS) or virtual dedicated server (VDS), is a method of partitioning a server into multiple independent virtual servers that each have the characteristics of a dedicated server, using virtualization techniques. Each server can run a different operating system and restart independently. In the web hosting field, several names overlap the same type of offerings and therefore services. The acronyms VPS (Virtual Private Server) and VDS (Virtual Dedicated Server) refer to the same concept, and their usage is sometimes confusing. A virtual server is a logical sub-part of a hosting server. Resources are therefore shared between different logical partitions that are independent of each other, and that behave individually as a standard dedicated server with a few reservations, particularly regarding the kernel, file system or network interfaces. Isolation-based solutions are often called virtual private servers, with the term virtual dedicated server being attributed to paravirtualization-based solutions, but commercial names often mix or conflate them. A physical server can be seen as a book. This book is made up of independent blank pages all numbered 1. Depending on the space needed for a virtual server, it will occupy more or fewer pages. But the fact that these pages are independent means that the different virtual servers inside the machine are in no way linked. A failure occurring on one server will therefore not affect another. We also note that following the use of virtual servers, the physical server changes its main function since its sole purpose becomes to manage and ensure the proper functioning of the virtual servers. Indeed, in the event of a failure, this main server informs the user in advance, allowing them to replace the component even before it has failed. The main reasons for partitioning a physical machine into multiple virtual dedicated servers are to improve security: if one of the applications, for example the web server, is corrupted or has problems, the other applications located in different virtual dedicated servers will continue to function normally. This also reduces the cost and the number of physical servers needed: it is also possible to group multiple virtual servers on the same physical server, while maintaining perfect isolation between servers and therefore very good security, as well as configurations that can be completely different. This no longer requires one physical machine per server and reduces cost, consumption and computer room space usage.

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