lsb_release -a 查看阿里云系统版本

安装nginx依赖库

yum install openssl
yum install zlib
yum install pcre

安装nginx库

rpm -Uvh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm

执行安装nginx

yum install nginx

启动服务

systemctl start nginx

查看服务状态

systemctl status nginx

截图显示，就是安装成功了。
公网ip，80port默认打开