virtual server


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virtual server

(World-Wide Web)
A configuration of a World-Wide Web server that appears to clients as an independent server but which is actually running on a computer that is shared by any number of other virtual servers. Each virtual server can be configured as an independent website, with its own hostname, content, and security settings.

DNS maps the hostnames of all virtual servers on one physical server to its IP address. The web server software then uses the "Host" header in the HTTP request to determine which virtual server the request was for, and then processes the request using that virtual server's configuration.

Virtual servers allow Internet Service Providers to share one computer between multiple websites while allowing the owner of each website to use and administer the server as though they had complete control.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

virtual server

(1) See server virtualization. Contrast with virtual host.

(2) A virtual machine environment from Microsoft for Windows servers. See Microsoft Virtual Server.

(3) Multiple servers that appear as one system image to the operating system or to the network administrator. See network virtualization.

(4) One instance of a Web or application server running in a single computer that is hosting multiple Web or application servers. See Web hosting.

(5) Multiple servers that appear as one server for load balancing. For example, all clients use the IP address of the virtual server, which uses address translation to point to a real server based on its load balancing algorithm.


Load Balancing
For load balancing, all clients use the address of the virtual server, which is substituted with the address of one of the real servers. The selection algorithm could be simple round robin or based on the current load of the servers. See round robin.
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References in periodicals archive ?
Los Angeles, CA, August 29, 2010 --(PR.com)-- Infinitely Virtual, a rapidly expanding provider of high quality and affordable virtual server technology, is pleased to announce the use of Edge's 4GB (1X4GB) PC310600 memory on their blade servers.
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<p>Hitachi's second release, its Virtual Server Reporter (VSR), uses Aptare Inc.'s StorageConsole to provide an end-to-end view of virtualized VMware servers and their respective storage usage.
For example, companies that have different departmental or branch-office applications written for different operating systems can consolidate them under one virtual server and access them all directly from the physical KVM console.
The agreement comes just one month after the introduction of Ooredoo's first locally hosted, enterprise-class Infrastructure as a Service (IaaS) virtual server, highlighting the growing popularity and efficiency of its advanced capabilities.

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