1. 使用yum安装nginx需要包括Nginx的库，安装Nginx的库
rpm -Uvh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
2. 使用下面命令安装nginx
yum install nginx
3. 启动Nginx
service nginx start
或
systemctl start nginx.service
rpm -Uvh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
yum install nginx
service nginx start
或
systemctl start nginx.service