1. nginx, mongodb
?
都可以用yum安装,yum源都是有nginx, mongodb自已提供的
2. ruby
1.9.3后yaml的解析器改成Psych了,所以要先装libyaml
参考http://collectiveidea.com/blog/archives/2011/10/31/install-ruby-193-with-libyaml-on-centos/