服务器装完Web环境，Nginx、MySQL、Redis、phpMyAdmin一套下来，机器上开着七八个监听端口。用ss一查吓一跳：sudoss-tlnpStateLocalAddress:PortProcessLISTEN0.0.0.0:22sshdLISTEN0.0.0.0:80nginxLISTEN0.0.0.0:443nginxLISTEN127.0.0.1:3306mysqldLISTE