Hi Zhusong,
In order to deploy your rails application you can make use of the following wiki links:
http://www.hostingrails.com/forums/wiki_thread/1
http://www.hostingrails.com/forums/deployment_troubleshooting_thread/91
After making the necessary changes like:
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The config/environment.rb should specify the environment as production. ie,
ENV['RAILS_ENV'] ||= 'production'
The above line should be uncommented. Since your application is running in FCGI, the public/htaccess file should contain this line.
RewriteRule ^(.*)$ dispatch.fcgi [QSA,L]
And we should comment out the line " AddHandler fastcgi-script .fcgi ". Make sure that the shebang line in public/dispatch.fcgi is
#!/usr/local/bin/ruby
The above line tells the dispatch.fcgi from where the ruby binary has to be called. Create the database from c-panel with full user privilages. Then populate the database using the command
$ rake db:migrate RAILS_ENV='production'
Move the existing public_html to public_html.bk
$ mv public_html public_html.bk
Create a sym link to public_html from rails_app/public.
$ ln -s rails_app/public public_html
===
You can bump up your rails application on mongrel using the wiki link :
http://www.hostingrails.com/forums/wiki_thread/19
The following wiki link will guide you for Capistrano deployment of your rails app:
http://www.hostingrails.com/forums/wiki_thread/46