基本命令
nginx 服务启动，
systemctl start nginx
systemctl stop nginx
systemctl restart nginx
查看进程：
ps -ef | grep nginx
查看nginx日志：
tail -f /var/log/nginx/access.log
nginx -t 检查nginx配置文件是否正确基本配置
cd /etc/nginx/conf.d
vim online.conf原文：https://www.cnblogs.com/yanxioayu/p/12052309.html