1、首先下载对应最新版nginx
wget http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
2、然后就是建立yum仓库
rpm -ivh nginx-release-centos-7-0.el7.ngx.noarch.rpm
3、卸载系统原有的旧版的nginx
yum remove nginx
4、下载安装nginx
yum install nginx
5、启动nginx
systemctl start nginx