To add NGINX yum repository, create a file named /etc/yum.repos.d/nginx.repo and paste one of the configurations below:
CentOS:
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1
原文：http://www.cnblogs.com/lixyu/p/7250147.html