sudo rpm -ivh http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-60.el6.ngx.noarch.rpm

/etc/yum.repos.d/nginx.repo

[nginx] name=nginx repo baseurl=http://nginx.org/packages/centos/6/$basearch/ gpgcheck=0 enabled=1

sudo yum install nginx
sudo service nginx start

http://vps/ とかで確認。

/usr/share/nginx/html/index.html が表示されるはず。