卸载Firewall ID,重装IPTABLES:先 停止服务
systemctl stop firewalld systemctl mask firewalld
yum install iptables-services
开机启动IPTABLES: systemctl enable iptables
管理服务 systemctl [stop|start|restart] iptables
开放端口:
/sbin/iptables -I INPUT -p tcp --dport 3306 -j ACCEPT
永久保存IPTABLES设置: service iptables save