yum -y install gcc yum install flex autoconf zlib curl zlib-devel curl-devel bzip2 bzip2-devel ncurses-devel libjpeg-devel libpng-devel libtiff-devel freetype-devel pam-devel gcc+ gcc-c++ libxml2 libxml2-devel libxslt libxslt-devel
二：安装rvm
https://rvm.beginrescueend.com/rvm/install/Multi-User installations --
sudo bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/ binscripts/rvm-installer)
三：安装ruby
rvm install 1.9.2 rvm use ruby-1.9.2 --default
四：安装rails
gem install rails -v 3.0.0