The Advantages of Choosing A KVM PVS

1. THE ADVANTAGES OF CHOOSING A KVM VPS

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3. KVM (KERNEL BASED VIRTUALIZATION) • After Intel (VT-X) and AMD (AMD-V) implemented hardware virtualization support in their processors, Kernel based virtualization was developed to build on these features. • Today, it is maintained by Red Hat, the company that offers the most important Linux professional distribution, as well as the widely-used CentOS. • KVM hypervisors use a module built inside the operating system kernel that allows them to access the virtualization features of the CPU. The module was quickly adopted by the industry, and was included in the mainline Linux kernel since version 2.6. • This is a different approach from the one used by competing technologies. XEN for example doesn’t use the kernel at all and actually operates outside the host operating system, while other hypervisors emulate the CPU completely.

4. ADVANTAGES OF KVM HYPERVISORS • By working directly with the kernel, KVM has often been described as a bare-metal hypervisor. This translates in superior performance, when compared with other technologies using the same amount of hardware resources. • The direct access to resources also allows a very fast resizing of virtual machines, with only a minimal downtime required in order to adjust the number of CPU cores, the amount of RAM or disk storage space. • Virtual machines run as typical Linux processes, under the normal operating system environment. As a result, they provide the full set of features of the host system and support the latest technologies included in the Linux kernel, out of the box. For example, any file system supported by Linux can be configured on the virtual servers.

5. ADVANTAGES OF KVM HYPERVISORS • Working directly with the kernel also enables some very important security features. Security Improved Linux (SELinux) is active in all virtual machines, while communication between them is strictly controlled. • On top of that runs another security layer known as sVirt, which allows setting Mandatory Access Control Rules (MAC) to be applied to the virtual machines, with well-defined security boundaries and limits. • As a result, KVM hypervisors have earned some of the most difficult security certifications, including the Assessment Certification Level 4+ (EAL4+) required by the US government. • KVM hypervisors offer full control over the server and its hardware resources. This means that virtual machines can use any type of operating system, including custom kernels that are required by some applications.

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