HowTo Install Redmine in a sub-URI » History » Version 10

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Zack s, 2012-08-01 10:27

HowTo Install Redmine in a sub-URI

This page explains how to run Redmine in a subdirectory of your site, for instance ; in such a case, you can feel lost because the classic Redmine install does not work directly, and the links to css or javascript files seem to be broken. In this page, we assume you want to run Redmine under "/redmine/" subdirectory of your site.

Using Redmine::Utils (preferred solution)

Add the following line at the bottom of your config/environment.rb

Redmine::Utils::relative_url_root = "/redmine" 

Then restart your application.

Using Rails features

Add the following line at the end of your config/environment.rb :

ActionController::AbstractRequest.relative_url_root = "/redmine" 
Rails will then prefix all links with "/redmine". It can be considered as the simplest, cleanest and most flexible solution. Then restart your application. In more recent versions of Rails the class hierarchy has changed slightly and you will need to use
ActionController::Base.relative_url_root = "/redmine" 
for the class name.

Using Mongrel features

If you run Redmine under Mongrel server, you can alternatively use the "--prefix" option of Mongrel :

mongrel_rails start --prefix=/redmine

Mongrel_rails service "--prefix" directive does NOT work with Rails 2.3.x
To fix this issue create a file config/initializers/patch_for_mongrel.rb [name of file can be anything]:

# Fix for mongrel which still doesn't know about Rails 2.2's changes, 
# We provide a backwards compatible wrapper around the new
# ActionController::base.relative_url_root,
# so it can still be called off of the actually non-existing
# AbstractRequest class.

module ActionController
  class AbstractRequest < ActionController::Request
    def self.relative_url_root=(path)
    def self.relative_url_root
# Thanks to

You may not run Mongrel on port 80 : if you have an Apache server on the same host, and you run Mongrel on port 8000, you can use the following Apache config to redirect (with Apache's mod_proxy enabled) :

ProxyPass /redmine http://localhost:8000/redmine
ProxyPassReverse /redmine http://localhost:8000/redmine

Using Passenger (aka mod_rails) features

If you run Redmine under Apache web server with Phusion Passenger module, you can follow this guide ; please note it won't work correctly on some versions of Passenger or some Linux distributions.

With a reverse proxy

If you have an Apache webserver in front of it (with mod_proxy enabled), or an Apache reverse proxy on another machine, you can run Redmine on a specific port and use this kind of config so it appears to be running in a subdirectory :

ProxyPass /redmine http://real-redmine-server.localdomain:3000/
ProxyPassReverse /redmine http://real-redmine-server.localdomain:3000/
See Apache official documentation to adapt it.

Old versions of Redmine and Rails

If you run a very old version of Redmine (don't know exactly which ones), maybe your version of Rails' ActionController does not support the "relative_url_root" mentionned above. Then you can look at this page to reproduce the same behaviour, but it is NOT a very good idea in most cases, you should consider upgrading Redmine.


If this page did not answered your problems, you can see #2508 or this thread.

Windows : Configuring Ruby On Rails App in a subdirectory under Apache -