OS virtualization

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OS virtualization

(1) The term may erroneously refer to traditional virtualization methods rather than the technique described below (see virtual machine).

(2) A method for splitting a server into multiple partitions called "containers" or "virtual environments" (VEs) in order to prevent applications from interfering with each other. A server running OS virtualization is also called a "virtual private server" (VPS).

The OS virtualization method differs from the traditional "virtual machine" (VM) method, because it shares one operating system just as in the typical user's computer. Decades ago, OS virtualization was built into various Unix operating systems, and it migrated into the Linux world in the mid-2000s. Microsoft also built in containers in Windows Server 2016. Docker is the most prominent software for setting up and managing containers (see Docker).

Advantages Over Virtual Machines (VMs)
In the traditional virtual machine method, each partition includes its own guest operating system, which communicates with the hardware through a virtual machine monitor (VMM). The more VMs running in the server at the same time, the more the entire system slows. However, containers communicate directly to the host operating system just as in a non-virtualized computer, and RAM and CPU cycles are minimized. Depending on the size of the app and required components in each container, hundreds of containers can exist in a single machine.

Most cloud computing providers only support virtual machines; however, containers can be deployed in this environment by running within a virtual machine. See virtual machine, Docker, Virtuozzo and microservices.

References in periodicals archive ?
Joyent employs operating system-level virtualization while most of the industry uses less efficient software emulation of hardware.
The addition of operating system-level virtualization technology provided by the OpenVZ project provides even greater value by helping to increase utilization rates without impacting performance of SPARC-based servers.
Arvato mobile uses SWsoft Virtuozzo, the leading operating system-level virtualization solution, to consolidate physical servers onto virtual servers that offer greater flexibility in managing workloads and the entire datacenter, while reducing the number of physical servers required.
Delivery of the checkpointing and live migration functionality as part of OpenVZ brings a capability that no other open source operating system-level virtualization software offers.
These updates to our Virtuozzo operating system-level virtualization technology provide significant improvements in terms of performance, scalability and security for our customers," said Kurt Daniel, vice president of marketing and alliances, SWsoft.
Users Can Benefit from Operating System-Level Virtualization Technology

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