One of the more popular services to provide with a web server is to host a virtual domain. Also known as a virtual host, a virtual domain is a complete website with its own domain name, as if it were a standalone machine, but it's hosted on the same machine as other websites. Apache implements this capability in a simple way with directives in the apache2.conf configuration file.
Apache now can dynamically host virtual servers by using the mod_vhost_alias module you read about in the preceding section of the chapter. The module is primarily intended for ISPs and similar large sites that host a large number of virtual sites. This module is for more advanced users and, as such, it is outside the scope of this introductory chapter. Instead, this section concentrates on the traditional ways of hosting virtual servers.
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