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IP Address Virtual Hosts
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In the IP address virtual hosting method, your server must have a different IP address for each virtual host. The IP address you use is already set up to reference your system. Network system administration operations can set up your machine to support several IP addresses. Your machine could have separate physical network connections for each one, or a particular connection could be configured to listen for several IP addresses at once. In effect, any of the IP addresses can access your system. You can configure Apache to run a separate daemon for each virtual host, separately listening for each IP address, or you can have a single daemon running that listens for requests for all
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the virtual hosts. To set up a single daemon to manage all virtual hosts, use VirtualHost directives. To set up a separate daemon for each host, also use the Listen directive. A VirtualHost directive block must be set up for each virtual host. Within each VirtualHost block, you place the appropriate directives for accessing a host. You should have ServerAdmin, ServerName, DocumentRoot, and TransferLog directives specifying the particular values for that host. You can use any directive within a VirtualHost block, except for ServerType (1.3), StartServers, MaxSpareServers, MinSpareServers, MaxRequestsPerChild, Listen, PidFile, TypesConfig, ServerRoot, and NameVirtualHost. Although you can use domain names for the address in the VirtualHost directive, using the actual IP address is preferable. This way, you are not dependent on your domain name service to make the correct domain name associations. Be sure to leave an IP address for your main server. If you use all the available IP addresses for your machine for virtual hosts, you can no longer access your main server. You could, of course, reconfigure your main server as a virtual host. The following example shows two IP-based virtual hosts blocks: one using an IP address, and the other a domain name that associates with an IP address:
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<VirtualHost 192.168.1.23> ServerAdmin webmaster@mail.mypics.com DocumentRoot /groups/mypics/html ServerName www.mypics.com ErrorLog /groups/mypics/logs/error_log .... </VirtualHost> <VirtualHost www.myproj.org> ServerAdmin webmaster@mail.myproj.org DocumentRoot /groups/myproj/html ServerName www.myproj.org ErrorLog /groups/myproj/logs/error_log .... </VirtualHost>
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With IP-based virtual hosting, you are limited to the number of IP addresses your system supports. With name-based virtual hosting, you can support any number of virtual hosts using no additional IP addresses. With only a single IP address for your machine, you can still support an unlimited number of virtual hosts. Such a capability is made possible by the HTTP/1.1 protocol, which lets a server identify the name by which it is being accessed. This method requires the client, the remote user, to use a browser that supports the HTTP/1.1 protocol, as current browsers do (though older ones may not). A browser using such a protocol can send a host header specifying the particular host to use on a machine. To implement name-based virtual hosting, use a VirtualHost directive for each host and a NameVirtualHost directive to specify the IP address you want to use for the virtual hosts. If your system has only one IP address, you need to use that address. Within the VirtualHost directives, you use the ServerName directive to specify the domain name you want to use for that host. Using ServerName to specify the domain name is important to avoid a DNS lookup. A DNS lookup failure disables the virtual host. The VirtualHost directives each take the same IP address specified in the NameVirtualHost directive as their argument. You use Apache directives within the VirtualHost blocks to configure each host separately. Name-
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based virtual hosting uses the domain name address specified in a host header to determine the virtual host to use. If no such information exists, the first host is used as the default. The following example implements two name-based virtual hosts. Here, www.mypics.com and www.myproj.org are implemented as name-based virtual hosts instead of IP-based hosts:
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ServerName turtle.mytrek.com NameVirtualHost 192.168.1.5 <VirtualHost 192.168.1.5> ServerName www.mypics.com ServerAdmin webmaster@mail.mypics.com DocumentRoot /var/www/mypics/html ErrorLog /var/www/mypics/logs/error_log ... </VirtualHost> <VirtualHost 192.168.1.5> ServerName www.myproj.org ServerAdmin webmaster@mail.myproj.org DocumentRoot /var/www/myproj/html ErrorLog /var/www/myproj/logs/error_log ... </VirtualHost>
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If your system has only one IP address, implementing virtual hosts prevents access to your main server with that address. You could no longer use your main server as a Web server directly; you could only use it indirectly to manage your virtual host. You could configure a virtual host to manage your main server's Web pages. You would then use your main server to support a set of virtual hosts that would function as Web sites, rather than the main server operating as one site directly. If your machine has two or more IP addresses, you can use one for the main server and the other for your virtual hosts. You can even mix IP-based virtual hosts and name-based virtual hosts on your server. You can also use separate IP addresses to support different sets of virtual hosts. You can further have several domain addresses access the same virtual host. To do so, place a ServerAlias directive listing the domain names within the selected VirtualHost block.
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