From: http://www.cnblogs.com/ShepherdIsland/p/yum_install_nginx.html
先安装nginx的yum源
http://nginx.org/en/linux_packages.html#stable 找到链接，安装：
rpm -ivh http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0.el6.ngx.noarch.rpm
查看：
yum info nginx
安装：
yum install nginx
service nginx start
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