Nginx

### 启动和管理nginx服务
```bash
sudo systemctl start nginx      # 启动nginx服务
sudo systemctl enable nginx     # 设置nginx开机自启
sudo systemctl status nginx     # 查看nginx服务状态
sudo systemctl stop nginx       # 停止nginx服务
sudo systemctl restart nginx    # 重启nginx服务
sudo systemctl reload nginx     # 重新加载nginx配置

配置防火墙

sudo ufw allow 'Nginx Full'  # 允许HTTP和HTTPS流量