Open Source Virtualization Software Xen
What is the Xen Project?
The Xen Project is the home for several virtualization related open source projects, and Xen Project is the new name for the Xen open source community. The Xen Project develops virtualization technologies powering the world's largest clouds in production and is the foundation of many commercial products. Technology developed by the Xen Project powers public clouds such as Amazon Web Services, Rackspace Public Cloud, and many others. Examples of Xen based server products include Huawei UVP, Oracle VM and Citrix XenServer. Examples of client products and appliances include QubesOS, Citrix XenClient and Netscaler. The Xen Project is 10 years old, and the technology it has created is mature and its stability and versatility is second to none.
Virtual Environment (VE, also known as VPS, container, partition etc.) is an isolated program execution environment, which (from the point of view of its owner) looks and feels like a separate physical server.
A VE has its own set of processes starting from init, file system, users (including root), network interfaces with IP addresses, routing tables, firewall rules (netfilter/iptables), etc.
Multiple VEs co-exist within a single physical server. Different VEs can run different Linux distributions, but all VEs operate under the same kernel.
Operating system-level virtualization enables multiple isolated execution environments within a single operating system kernel. It has the best possible (i. e. close to native) performance and density, and features dynamic resource management. On the other hand, this technology does not allow to run different kernels from different OSs at the same time.
We are pleased to announce the immediate availability of Xen 4.2.2 for CentOS-6/x86_64. The software is delivered as a dedicated repository on Centos.org and was developed with the help of the Xen Project, the Citrix Xen open-source team, GoDaddy.com's Cloud Engineering team and Rackspace Hosting.
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