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Requests sent to the IP address used for your virtual hosts have to match one of the configured virtual domain names To catch requests that do not match one of these virtual hosts, you can set up a default virtual host using _default_:* Unmatched requests are then handled by this virtual host
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<VirtualHost _default_:*>
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If you have implemented many virtual hosts on your server that have the same configuration, you can use a technique called dynamic virtual hosting to have these virtual hosts generated dynamically The code for implementing your virtual hosts becomes much smaller, and as
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a result, your server accesses them faster Adding yet more virtual hosts becomes a simple matter of creating appropriate directories and adding entries for them in the DNS server To make dynamic virtual hosting work, the server uses commands in the mod_vhost_ alias module (supported in Apache version 136 and up) to rewrite both the server name and the document root to those of the appropriate virtual server (for older Apache versions before 136, you use the mod_rewrite module) Dynamic virtual hosting can be either name-based or IP-based In either case, you have to set the UseCanonicalName directive in such a way as to allow the server to use the virtual hostname instead of the server s own name For name-based hosting, you simply turn off UseCanonicalName This allows your server to obtain the hostname from the host header of the user request For IP-based hosting, you set the UseCanonicalName directive to DNS This allows the server to look up the host in the DNS server
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You then have to enable the server to locate the different document root directories and CGI bin directories for your various virtual hosts You use the VirtualDocumentRoot directive to specify the template for virtual hosts directories For example, if you place the different host directories in the /var/www/hosts directory, you can then set the VirtualDocumentRoot directive accordingly
VirtualDocumentRoot /var/www/hosts/%0/html
The %0 will be replaced with the virtual host s name when that virtual host is accessed It is important that you create the dynamic virtual host s directory using that host s name For example, for a dynamic virtual host called wwwmygolforg, you first create a directory named /var/www/hosts/wwwmygolforg, then create subdirectories for the document root and CGI programs, as in /var/www/hosts/wwwmygolforg/html For the CGI directory, use the VirtualScriptAlias directive to specify the CGI subdirectory you use
VirtualScriptAlias /var/www/hosts/%0/cgi-bin
A simple example of name-based dynamic virtual hosting directives follows:
UseCanonicalName Off VirtualDocumentRoot /var/www/hosts/%0/html VirtualScriptAlias /var/www/hosts/%0/cgi-bin
A request for wwwmygolfcom/html/mypage evaluates to
/var/www/hosts/wwwmygolfcom/html/mypage
A simple example of dynamic virtual hosting is shown here:
UseCanonicalName Off NameVirtualHost 19216815 <VirtualHost 19216815> ServerName wwwmygolfcom
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ServerAdmin webmaster@mailmygolfcom VirtualDocumentRoot /var/www/hosts/%0/html VirtualScriptAlias /var/www/hosts/%0/cgi-bin </VirtualHost>
To implement IP-based dynamic virtual hosting instead, set the UseCanonicalName to DNS instead of Off
UseCanonicalName DNS VirtualDocumentRoot /var/www/hosts/%0/html VirtualScriptAlias /var/www/hosts/%0/cgi-bin
Interpolated Strings
The mod_vhots_alias module supports various interpolated strings, each beginning with a % symbol and followed by a number As you have seen, %0 references the entire web address %1 references only the first segment, %2 references the second, %-1 references the last part, and %2+ references from the second part on For example, to use only the second part of a web address for the directory name, use the following directives:
VirtualDocumentRoot /var/www/hosts/%2/html VirtualScriptAlias /var/www/hosts/%2/cgi-bin
In this case, a request made for wwwmygolfcom/html/mypage uses only the second part of the web address This would be mygolf in wwwmygolfcom, and would evaluate to
/var/www/hosts/mygolf/html/mypage
If you used %2+ instead, as in /var/www/hosts/%2/html, the request for wwwmygolf com/html/mypage would evaluate to
/var/www/hosts/mygolfcom/html/mypage
The same method works for IP addresses, where %1 references the first IP address segment, %2 references the second, and so on
Logs for Virtual Hosts
One drawback of dynamic virtual hosting is that you can set up only one log for all your hosts However, you can create your own shell program to simply cut out the entries for the different hosts in that log
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