直接yum install nginx不行，要先处理下源，下面是安装完整流程

1.

rpm -ivh http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0.el6.ngx.noarch.rpm

2.

查看yum的nginx信息

yum info nginx

3.

安装并启动nignx

yun install nignx

service nginx start