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OpenVZ:

OpenVZ is an operating system-level virtualization technology based on the Linux kernel and operating system. OpenVZ allows a physical server to run multiple isolated operating system instances, known as containers, Virtual Private Servers (VPSs), or Virtual Environments (VEs).
OpenVZ is an open source container-based virtualization solution built on Linux. OpenVZ creates isolated, secure containers (otherwise known as VEs or VPSs) on a single physical server enabling better server utilization and ensuring that applications do not conflict. Each container performs and executes exactly like a stand-alone server; containers can be rebooted independently and have root access, users, IP addresses, memory, processes, files, applications, system libraries and configuration files.

OpenVZ VPS
Unique features of OpenVZ:
The architecture of OpenVZ Virtual Private Servers is different from the traditional virtual machines architecture because it always runs the same OS kernel as the host system (while still allowing multiple Linux distributions in individual VPSs). This single-kernel implementation technology enables running Virtual Private Servers with a near-zero overhead. Thus, OpenVZ VPSs offer an order of magnitude higher efficiency and manageability than traditional virtualization technologies.
OS Virtualization:
From the point of view of applications and Virtual Private Server users, each VPS is an independent system. This independency is provided by a virtualization layer in the kernel of the host OS. The main features of the virtualization layer implemented in OpenVZ are the following:
*Any VPS looks and behaves like a regular Linux system. It has standard startup scripts; software from vendors can run inside a VPS without OpenVZ-specific modifications or adjustment;
*A user can change any configuration file and install additional software;
*Virtual Private Servers are completely isolated from each other (file system, processes, Inter Process Communication (IPC), sysctl variables);
*Processes belonging to a VPS are scheduled for execution on all available CPUs.
Network virtualization:
The OpenVZ network virtualization layer is designed to isolate VPSs from each other and from the physical network.
*Each VPS has its own IP address; multiple IP addresses per VPS are allowed. Network traffic of a VPS is isolated from the other VPSs.
*It is possible to set up firewall rules from inside a VPS;
*Routing table manipulations and advanced routing features are supported for individual VPSs.
Resource Management:
OpenVZ Resource Management controls the amount of resources available for Virtual Private Servers. The controlled resources include such parameters as CPU power, disk space, a set of memory-related parameters, etc. Resource management allows OpenVZ to:
*Guarantee Quality-of-Service (QoS);
*Provide performance and resource isolation and protect from denial-of-service attacks.
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