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.

Working variant (Sun Jun 26 13:48:50 MSK 2016)

Change the following lines at the bottom of your config/environment.rb

# Initialize the Rails application


RedmineApp::Application.routes.default_scope = "/redmine" 
# Initialize the Rails application

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.

Using Passenger+Nginx features

See official guide (This is the only solution that worked for me - 30 Oct 2012)

Using Unicorn+Nginx

nginx config:

location /redmine {
        alias   <PATH_TO>/redmine/public;

        try_files $uri/index.html $uri.html $uri @app;


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

RedmineApp::Application.routes.draw do
scope Redmine::Utils::relative_url_root do
  root :to => 'welcome#index', :as => 'home'

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.

With puma

  1. Define RAILS_RELATIVE_URL_ROOT environment variable :
    export RAILS_RELATIVE_URL_ROOT=/redmine
    or use RedmineUtils method
    This allows rails to generate urls prefixed by RAILS_RELATIVE_URL_ROOT.
  2. Then update you
    # This file is used by Rack-based servers to start the application.
    require ::File.expand_path('../config/environment',  __FILE__)
    map ENV['RAILS_RELATIVE_URL_ROOT'] || '/' do
      run RedmineApp::Application
    This allows rack to handle urls prefixed with RAILS_RELATIVE_URL_ROOT.

Both points are necessary.

If using Docker official image, passenger variant

Create a Dockerfile in an empty directory with the following contents, adjusting the tag to the version you want to use:

FROM redmine:2.6.10-passenger
COPY assets/passenger-nginx-config-template.erb /passenger-nginx-config-template.erb
CMD ["passenger", "start", "--nginx-config-template", "/passenger-nginx-config-template.erb"]

Create a passenger-nginx-config-template.erb file in the same directory with the following contents, adjusting the sub-URI you want to use:

<%= include_passenger_internal_template('global.erb') %>

worker_processes 1;
events {
    worker_connections 4096;

http {
    <%= include_passenger_internal_template('http.erb', 4) %>

    default_type application/octet-stream;
    types_hash_max_size 2048;
    server_names_hash_bucket_size 64;
    client_max_body_size 1024m;
    access_log off;
    keepalive_timeout 60;
    underscores_in_headers on;
    gzip on;
    gzip_comp_level 3;
    gzip_min_length 150;
    gzip_proxied any;
    gzip_types text/plain text/css text/json text/javascript
        application/javascript application/x-javascript application/json
        application/rss+xml application/ application/x-font-ttf
        application/xml font/opentype image/svg+xml text/xml;

    server {
        server_name _;
        root '/usr/src/redmine/public';
        passenger_app_env 'production';
        passenger_spawn_method 'smart';
        passenger_load_shell_envvars off;

        location ~ ^/suburi(/.*|$) {
            alias /usr/src/redmine/public$1;
            passenger_base_uri /suburi;
            passenger_app_root /usr/src/redmine;
            passenger_document_root /usr/src/redmine/public;
            passenger_enabled on;


Build the Docker image and launch a container:

docker build -t redmine-in-a-sub-uri:2.6.10-passenger .
docker run -d --name redmine-in-a-sub-uri -p 3000:3000 redmine-in-a-sub-uri:2.6.10-passenger

The resultant Redmine can be accessed in http://localhost:3000/suburi

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 -

Configuring ruby on rails Action Controller -

Updated by David Navarro Solans almost 5 years ago · 18 revisions