How to manage firewall based on iptables command in Centos7

防火墙中打开跟踪器端口（默认为 22122）:

# vi /etc/sysconfig/iptables

添加如下端口行：

## FastDFS Tracker Port
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22122 -j ACCEPT

重启防火墙：

# service iptables restart