linux centOS开关防火墙，设置防火墙例外端口，开机启动、禁用

1、例外端口：查看、添加、删除：

firewall-cmd --list-all

firewall-cmd --zone=public --add-port=9000/tcp --permanent

firewall-cmd --zone=public --remove-port=9000/tcp --permanent

重载使生效：

firewall-cmd --reload

2、防火墙状态：查看、关闭、启动、重启：

systemctl status firewalld

systemctl stop firewalld

systemctl start firewalld

systemctl restart firewalld

 3、开机启动：查看、禁用、启用：

systemctl is-enabled firewalld

systemctl disable firewalld

systemctl enable firewalld

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