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Memento is currently running at http://memento.giovannicapuano.net.
A video is also available on YouTube.
First of all, configure correctly config/database.yml and config/initializers/recaptcha.rb.
$ bundle install --deployment --without development test
$ bundle exec rake db:setup RAILS_ENV=production
$ bundle exec rake assets:precompile RAILS_ENV=production
$ rails server --environment=production