1. Prepare all the applications. 1) ruby. highly recommend use 1.8.6-1.8.7 http://www.ruby-lang.org/en/downloads/ ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-linux] mysql 5.1.45 2) install all required gem/ gem install *.gem rubygem actionmailer (2.3.11) actionpack (2.3.11) activerecord (2.3.11) activeresource (2.3.11) activesupport (2.3.11) i18n (0.4.2) mysql (2.8.1) rack (1.1.0, 1.0.1) rails (2.3.11) rake (0.8.7) rubygems-update (1.4.2) Ruby 1.9 is not supported yet. You have to use Ruby 1.8.x as stated above. RubyGems 1.3.1 or higher is required ( Rails 2.3.5 will fail with RubyGems 1.5.0 and later , stick to previous versions of RubyGems) Rake 0.8.3 or higher is required Rack 1.0.1 is required. If you don't have this exact version, database migration would fail. I18n 0.4.2 is required for Redmine >= 1.0.5 3) download redmine http://www.redmine.