Are you planning to purchase a vps for the operation of an Internet resource? Are you interested in the features of vps servers? After all, renting a virtual server is an ideal option for a website when there is already little virtual hosting, and a dedicated one is still far away.
Types of virtualization
The characteristics of vps hosting depend on the type of virtualization. Modern classification distinguishes: software and hardware types.
Software virtualization is based on the general exploitation of the server core. Essentially, all sites on the server share the core resource at all. This allows you to use more resources at any given time. This increases performance: operations take seconds. This explains why many seek to buy vps on software virtualization.
An example of software virtualization is OpenVZ (OVZ), which is often used in virtual vps hosting. In this case, the server core is used by all machines. The result is amazing speed and performance. Reinstalling the operating system when using OpenVZ takes seconds, and renting a virtual server is inexpensive.
The disadvantage of this method is the possibility of selling the company’s resource, which is included in the tariff, but is not used. As a result, instead of speed and performance, you can get a lot of problems with the site. That is why when using OpenVZ, overselling is so common, which is often used by unscrupulous hosters. As a rule, such companies offer the lowest prices. If the price of renting a vps server is striking in its cheapness, it is better to refuse such services.
Of the benefits – it is very convenient that OpenVZ is free. At the same time, this does not affect the functionality in any way, so this type of virtualization is on a variety of control panels. Commercial analogues are also popular, because the hoster is not responsible for the improper provision of free services under the law, and not everyone is ready to take risks. Paid Virtuozzo technology works stably, but the price can no longer be called low.
Hardware technologies are designed to allocate a limit of resources for work. That is, the principle of operation of a physical server is implemented. Much more hardware products can be offered to the consumer: AT-Xen and KVM, Hyper-V. Currently, there are no free hardware solutions, so their cost is higher.
Xen is a paravirtualization technology. Paravirtualization makes it possible to increase the performance of a vps server to the level of a physical one. Xen products run on any operating system. At the same time, the server is isolated from its neighbors, using its own core, memory and disk, sharing only the processor. AT-Xen allows you to move the server to another node if necessary.
The price of renting a hardware VPS AT-Xen is higher. But the benefits are significant:
- server control system;
- access to resources in full, provided by the tariff;
- performance stability;
- reliability and uninterrupted operation;
- the server can be moved.
KVM hosting virtualization hardware product has all the advantages of Xen, but has a simpler functionality. It should be noted that most users prefer to buy a vps server on KVM.
Advantages of KVM technology:
- with KVM, the client gets what the rights of the root user are, that is, the ability to install even software;
- the product supports OS and VNC capabilities, in which case the server is managed using these technologies as if it were hosted on your computer;
- simple and convenient interface;
- KVM supports any software, so you can experiment with it, choose a VPS on any software;
- potentially, technology provides great development opportunities, product performance is constantly increasing.
Hyper-V Hosting Virtualization Product
It is a hardware hypervisor. It is less popular, but offers optimal solutions for Windows. Hyper-V is not a standalone tool, but is built into Windows Server. Due to this, it takes up a minimum of space, and does not consume resources for its work.
When choosing a VPS hosting, such characteristics as geographic targeting are also taken into account – the state where the server hardware is located, RAM, disk space, quality of service.
Choose virtualization based on the needs of your projects.
Types of virtualization
To run multiple VPS on one real server, various types of virtualization technologies are used. This provides a logical isolation of any computing process that occurs on each medium.
To date, there are the following types of virtualization:
Full (hardware) virtualization. To separate the server resources, to ensure the independence of each vps from each other, special software is used, namely the hypervisor. As a result, virtual servers are more secure and faster. At the same time, the architecture of the physical server does not affect OS vps.
An example of such virtualization is: Hyper-V, KVM, Xen HVM.
Paravirtualization. This is a type of virtualization where guest operating systems are prepared to run in a virtualization environment. To this end, their kernels undergo some modification. The OS communicates with the Hypervisor program, which in turn presents it with a guest IP so as not to use the memory page table directly. Under such conditions, OS virtualization is possible in which the source code is open. Compared to the previous type of virtualization, it is characterized by higher performance.