在ubuntu 9.04上搭建ruby on rails環境

1 update ubuntu source and hardware
sudo apt-get update
sudo apt-get upgrede

2. install ruby
sudo apt-get install ruby-full
Or
sudo apt-get install ruby irb ri rdoc ruby-dev
ruby -v # => 1.8.7
3. install rubygems
sudo apt-get install rubygems
sudo gem update
sudo gem update --system

gem -v # => 1.3.1

4. install mysql or postgres/sqlite3
sudo apt-get mysql-server libmysql-ruby postgres libpq-dev sqlite3
sudo gem install postgres postgres-pr

5. intall Mongrel
sudo apt-get install install build-essential
sudo gem install mongrel

6. install rails
sudo gem install rails
$ export PATH=/var/lib/gems/1.8/bin:$PATH
Or
sudo gedit ~/.bashrc add export PATH=/var/lib/gems/1.8/bin:$PATH to the file and refresh with the source

rails -v # => 2.3.2

7. create rails application
rails demo
cd demo
./script/server

That's it.