linux对外开放端口号1、查询指定端口是否已经开启firewall-cmd --query-port=8091/tcp2、查看防火墙状态查看防火墙状态 systemctl status firewalld开启防火墙 systemctl start firewalld关闭防火墙 systemctl stop firewalld开启防火墙 service firewalld start若遇到无法开启