Virtual host server using the Internet to save the server hardware costs of technology, virtual host technology is mainly used in HTTP (Hypertext Transfer Protocol, and Hypertext Transfer Protocol) service, will be a server of some or all of the service logic is divided into multiple services unit, the external performance for multiple servers, so as to make full use of the server hardware resources,
The virtual host is the use of special software and hardware technology, a real physical server host is divided into multiple logical storage units, each logical unit no physical entity, but each logical unit can work like a real physical host on the network, has a separate IP address (or a Shared IP address), an independent domain name and the complete Internet server (support WWW, FTP, E-mail, etc.) functions,
Is the key technology of virtual host, even in the same hardware, same operating system, running open for multiple users to a different server program, and mutual interference, and individual users have their own part of the system resources (IP address, file storage, memory, CPU, etc.), completely independent between each virtual host, look in the outside world, each virtual host and a separate mainframe performance are exactly the same, so the host by the logic of virtualization is vividly called "virtual host",
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