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Kernel-based Virtual Machine (KVM) is a free and open-source virtualization module in the Linux kernel that allows the kernel to function as a hypervisor. It was merged into the mainline Linux kernel in version 2.6.20, which was released on February 5, 2007. [ 1 ]
Two types of virtualization are supported: container-based with LXC (starting from version 4.0 replacing OpenVZ used in version up to 3.4, included [10]), and full virtualization with KVM. [11] It includes a web-based management interface. [12] [13] There is also a mobile application available for controlling PVE environments. [14]
The first version of Virtuozzo, based on OpenVZ, is released. [4] 2003. First release of first open-source x86 hypervisor, Xen. February 18: Microsoft acquires virtualization technologies (Virtual PC and unreleased product called "Virtual Server") from Connectix Corporation.
Version TP and TP2, technology previews, offered host and VM management features, based on Xen hypervisor. Version 1.0 was the first stable release, introduced KVM and EC2 drivers, enabling hybrid clouds. Version 1.2 added new structure for the documentation and more hybrid functionality.
In the absence of hardware-assisted virtualization, versions 6.0.24 and earlier of VirtualBox could adopt a standard software-based virtualization approach. This mode supports 32-bit guest operating systems which run in rings 0 and 3 of the Intel ring architecture.
VMware ESXi (formerly ESX) is an enterprise-class, type-1 hypervisor developed by VMware, a subsidiary of Broadcom, for deploying and serving virtual computers.As a type-1 hypervisor, ESXi is not a software application that is installed on an operating system (OS); instead, it includes and integrates vital OS components, such as a kernel.
Oracle VM Server for x86 is a server virtualization offering from Oracle Corporation.Oracle VM Server for x86 incorporates the free and open-source Xen hypervisor technology, supports Windows, Linux, and Solaris [3] guests and includes an integrated Web based management console.
SmartOS is a free and open-source SVR4 hypervisor based on the UNIX operating system that combines OpenSolaris technology with bhyve and KVM virtualization. [2] Its core kernel contributes to the illumos project. [3] It features several technologies: Crossbow, DTrace, bhyve, KVM, ZFS, and Zones.