查看防火墙某个端口是否开放firewall-cmd --query-port=3306/tcp
开放防火墙端口3306firewall-cmd --zone=public --add-port=3306/tcp --permanent
查看防火墙状态systemctl status firewalld
关闭防火墙systemctl stop firewalld
打开防火墙systemctl start firewalld
开放一段端口firewall-cmd --zone=public --add-port=40000-45000/tcp --permanent
查看开放的端口列表firewall-cmd --zone=public --list-ports