1. # 添加防火墙端口
    2. firewall-cmd --zone=public --add-port=3306/tcp --permanent
    4. # 删除防火墙端口
    5. firewall-cmd --zone=public --remove-port=3306 --permanent
    7. # 重新加载防火墙
    8. firewall-cmd --reload
    10. # 启动
    11. systemctl start firewalld
    13. # 关闭
    14. systemctl stop firewalld
    16. # 查看状态
    17. systemctl status firewalld
    19. #开机禁用
    20. systemctl disable firewalld
    22. #开机启用
    23. systemctl enable firewalld