Base on 2 best article I found by googling    

• IIS 7.0 Server-Side 10 steps to get Ruby on Rails running on Windows with IIS FastCGI
  http://mvolo.com/blogs/serverside/archive/2007/02/18/10-steps-to-get-Ruby-on-Rails-running-on-Windows-with-IIS-FastCGI.aspx
• Ruby on Rails in IIS 7.0 with URL Rewriter  RuslanY Blog
  http://ruslany.net/2008/08/ruby-on-rails-in-iis-70-with-url-rewriter/

with something I found may be useful.    

First of all -  prepare files    

• ruby One-Click Installer (1.8.6-27)
  ruby186-27_rc2.exe
  http://rubyforge.org/frs/?group_id=167&release_id=41267
• Microsoft URL Rewrite Module 1.1 for IIS 7 (x64)
  rewrite_1.1_amd64_en-US.msi
  http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=d05111c1-b4f7-45f3-8f60-a8f2b9d49ed1
• Redmine 0.8.7 ( 2009-11-15)
  redmine-0.8.7.zip
  http://rubyforge.org/frs/?group_id=1850
• RubyForIIS
  RubyForIIS-0.1.exe
  http://avhelp.ucc.usyd.edu.au/james/RubyForIIS-0.1.exe

 Then – Install files    

Step 1: Install Ruby 1.8.6.
According to Redmine Installation Guide ( http://www.redmine.org/wiki/redmine/RedmineInstall ), Support Ruby version is 1.8.6. & 1.8.7. 

Step 2: Install rails

gem install rails

Step 3: Install RubyForIIS
Because the fcgi extension not bundle in rails.
Afterward, test fcgi    

c:\ruby\bin\>irb
irb(main):001:0> require 'fcgi'  
=> true   
irb(main):002:0> quit

Step 4: Extract Redmine files to target folder    

e.g.  C:\inetpub\redmine    

below I will call it  [Redmine Path]    

Step 5: Create folder and Set folder permission (Step 7 on Redmine Installation Guide)
make a folder called \tmp and \public\plugin_assets under [Redmine Path]

cd [Redmine Path]
md tmp
md public\plugin_assets

and assign tmp, files, log,  public\plugin_assets IWAM account ( or Network Service  account) has full control    

Step 6: Create Database
Just create database, user account and password (Step 3 on Redmine Installation Guide).
make sure the default  database character is 『utf-8″ because the create database script did not assign.    

Step 7: Config files
copy [Redmine Path]\config\database.y ml.example to [Redmine Path]\config\database. yml and edit the 『production』 database connection settings    

Step 8: run database create script on redmine root folder    

rake db:migrate RAILS_ENV=』production』    and create session store    

cd [Redmine Path]
rake config/initializers/session_store.rb

Step 9: test site by using build-in webrick (step 8 on Redmine Installation Guide).    

ruby script/server webrick -e production

Step 10:IIS config

1. Create a web site and set physical path to redmine public folder
2. Copy/rename [Redmine Path]\public\dispatch.fcgi.example to [Redmine Path]\public\dispatch.fcgi
3. Modify [Redmine Path]\config\environment.rb, uncomment line "# ENV['RAILS_ENV'] ||= 'production'" to assign the environment to production
4. Copy/rename [Redmine Path]\config\email.yml.example to [Redmine Path]\config\email.yml and setup Outgoing email settings
5. Module Setting
6. URL Mapping
Request path: dispatch.fcgi
Module: FastCgiModule
Executable (optional):
c:\Ruby\bin\Ruby.exe|[Redmine Path]\public\dispatch.fcgi production

Step 11:URL Rewrite

paste following url rewrite config into web.config under <system.webServer> branch

<rewrite>
 <rules>
 <clear />
 <rule name="Imported Rule 1-1" stopProcessing="true">
  <match url="^(.*)(\.png)(\.)$" ignoreCase="true" />
  <conditions logicalGrouping="MatchAll" />
  <action type="Rewrite" url="{R:1}.png" appendQueryString="false" />
 </rule>
 <rule name="Imported Rule 1">
  <match url="^$" ignoreCase="false" />
  <action type="Rewrite" url="index.html" appendQueryString="true" />
 </rule>
 <rule name="Imported Rule 2">
  <match url="^([^.]+)$" ignoreCase="false" />
  <action type="Rewrite" url="{R:1}.html" appendQueryString="true" />
 </rule>
 <rule name="Imported Rule 3" stopProcessing="true">
  <match url="^(.*)$" ignoreCase="false" />
  <conditions logicalGrouping="MatchAll">
  <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" pattern="" ignoreCase="false" />
  </conditions>
  <action type="Rewrite" url="dispatch.fcgi" appendQueryString="true" />
 </rule>
 </rules>
</rewrite>

Step 12:Minor configuration

[Redmine Path]\config\environment.rb

uncomment following line to force rails environment to production

ENV['RAILS_ENV'] ||= 'production'

http://www.redmine.org/

第一次接觸 Ruby、Ruby on Rail, 同時又要在Server 2008 的IIS7 上用FastCGI運行, 再加上外面的FAQ唔多齊全. 結果玩足一日才能夠安裝完成.