1.暂停nginx服务
sudo systemctl stop nginx
2.启动nginx服务
sudo systemctl start nginx
3.重启nginx服务
sudo systemctl restart nginx
4.加载配置，就是说大家修改了nginx的配置信息之后一定要重新加载，不然nginx修改之后是不起效的
sudo systemctl reload nginx
5.开机不启动nginx
sudo systemctl disable nginx
6.开机启动nginx
sudo systemctl enable nginx
