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Introduction to virtualization

740 bytes removed, 15:34, 21 October 2011
→‎Short comparison
Most applications running on a server can easily share a machine with others, if they could be isolated and secured. Further, in most situations, different operating systems are not required on the same server, merely multiple instances of a single ''operating system''. OS-level virtualization systems have been designed to provide the required isolation and security to run multiple applications or copies of the same OS (but different distributions of the OS) on the same server. [http://openvz.org/ OpenVZ], [http://www.swsoft.com/products/virtuozzo Virtuozzo], [http://linux-vserver.org/ Linux-VServer], [http://www.sun.com/bigadmin/content/zones/ Solaris Zones] and [http://www.freebsd.org/doc/en_US.ISO8859-1/books/arch-handbook/jail.html FreeBSD Jails] are examples of OS-level virtualization.
== Short comparison ==The three techniques differ in complexity of implementation, breadth of OS support, performance in comparison with standalone server, and level of access to common resources. For example, VMs have wider scope of usage, but poorer performance. ParaI could read a book about this without fniidng such real-VMs have better performance, but can support fewer OSs because one has to modify the original OS. Virtualization on the OS level provides the best performance and scalability compared to other world approaches. Performance difference of such systems can be as low as 1…3%, comparing with that of a standalone server. [[Virtual Environment]]s are usually also much simpler to administer as all of them can be accessed and administered from the host system. Generally, such systems are the best choice for server consolidation of same OS workloads.!
== Where to go further ==
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