安装curl
sudo apt-get install curl
安装RVM
curl -L https://get.rvm.io | bash -s stable
通过RVM来安装Ruby
rvm install 2.1.1
列举gem源
gem source -l
删除gem源
gem source -r https://rubygems.org/
添加gem源
gem source -a https://ruby.taobao.org
通过gem安装Rails
gem install rails
检查Rails版本
rails -v
Rails中的execjs安装nodejs为javascript runtime
sudo apt-get install nodejs
Ruby PG gem安装，需要生成Native Extension
sudo apt-get install libpq-dev sudo find / -name pg_config gem install pg -- --with-pg-config=/usr/bin/pg_config
