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You are here: Home » How to Automatically Redirect Subdirectory to Domain (Apache 2.4)

By Abhishek Ghosh November 23, 2018 8:52 pm Updated on November 23, 2018

How to Automatically Redirect Subdirectory to Domain (Apache 2.4)

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In professional shared hosting, many a times user directory is redirected towards a subdomain. They usually acheive it via some scripting langugage like Perl, PHP with or without MySQL like database. However, we can use just Apache module `mod_rewrite`’s dynamic mass virtual hosts feature to acheive near same result. Here is how to automatically redirect subdirectory to domain with Apache 2.4.

 

Automatically Redirect Subdirectory to Domain

 

First, it is important to note that we are using non-HTTPS sites for this guide. Second, we need a cloud based DNS service who supports wildcard entry. If we have content of `www.abhishek.thecustomizewindows.com` at `/var/abhishek/www` sub-directory path, then the system will redirect to `www.abhishek.thecustomizewindows.com`. If second entry is `www.ghosh.thecustomizewindows.com` at `/var/ghosh/www` sub-directory path, then the system will redirect to `www.ghosh.thecustomizewindows.com`. It is like permalink rewriting but with subdomain. As it is with subdomain, we need the reliability of DNS for faster resolution. In our example, `*.thecustomizewindows.com` will point to either main server IP or alternate IP. Easiest example of that configuration is :

RewriteEngine on
RewriteMap lowercase int:tolower
RewriteCond %{lowercase:%{HTTP_HOST}} ^www\.([^.]+)\.thecustomizewindows\.com$
RewriteRule ^(.*) /var/%1/www$1 

`tolower` directive is used to make sure that the hostnames used will be all lowercase to avoid ambiguity in the directory structure. We are adding the stanza on virtual host file. Apache official site has good documentation on dynamic mass virtual hosts :

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https://httpd.apache.org/docs/2.4/vhosts/mass.html
How to Automatically Redirect Subdirectory to Domain (Apache 2-4)

We can use the directives of Apache Module mod_vhost_alias :

https://httpd.apache.org/docs/2.4/mod/mod_vhost_alias.html

We can use a separate configuration file named `vhost.map` with content like this to point which subdomain will point where:

customer-1.thecustomizewindows.com /www/customers/1
customer-2.thecustomizewindows.com /www/customers/2
# ...
customer-N.thecustomizewindows.com /www/customers/N

In that case, our main configuration will be like following:

RewriteEngine on

RewriteMap lowercase int:tolower

# define the map file
RewriteMap vhost txt:/www/conf/vhost.map

# deal with aliases as above
RewriteCond %{REQUEST_URI} !^/icons/
RewriteCond %{REQUEST_URI} !^/cgi-bin/
RewriteCond ${lowercase:%{SERVER_NAME}} ^(.+)$
# this does the file-based remap
RewriteCond ${vhost:%1} ^(/.*)$
RewriteRule ^/(.*)$ %1/docs/$1

RewriteCond %{REQUEST_URI} ^/cgi-bin/
RewriteCond ${lowercase:%{SERVER_NAME}} ^(.+)$
RewriteCond ${vhost:%1} ^(/.*)$
RewriteRule ^/(.*)$ %1/cgi-bin/$1 [H=cgi-script] 

There are complex ways of achieving the result, such as using RewriteMap Directive with some scripting :

https://httpd.apache.org/docs/2.4/vhosts/mass.html

Hope it will help.

Tagged With apache2 domain with subdirectory , redirect domain sub directory to another domain subdirectory

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "How to Automatically Redirect Subdirectory to Domain (Apache 2.4)," in The Customize Windows, November 23, 2018, March 29, 2023, https://thecustomizewindows.com/2018/11/how-to-automatically-redirect-subdirectory-to-domain-apache-2-4/.

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