添加yum源（该命令执行之后，会在/etc/yum.respos.d下面多出一个nginx.repo）
rpm -ivh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
安装
yum -y install nginx
查看nginx的默认安装目录
whereis nginx
(1) Nginx配置路径：/etc/nginx/
(2) PID目录：/var/run/nginx.pid
(3) 错误日志：/var/log/nginx/error.log
(4) 访问日志：/var/log/nginx/access.log
(5) 默认站点目录：/usr/share/nginx/html
命令
重启系统服务
sudo systemctl daemon-reload
设置开机启动：
sudo systemctl enable nginx
启动
sudo systemctl start nginx
停止
sudo systemctl stop nginx
重启
sudo systemctl restart nginx
查看状态
sudo systemctl status nginx