防火墙开放端口

• el6

#开放端口（7777）
iptables -I INPUT -p tcp -m state --state NEW -m tcp --dport 7777 -j ACCEPT
#保存
/etc/rc.d/init.d/iptables save
#重载
service iptables restart

• el7

firewall-cmd --zone=public --add-port=7777/tcp --permanent
#重新载入
firewall-cmd --reload

删除所有规则

iptables -Z
iptables -t nat -F
iptables -t nat -X
iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
iptables -t nat -P OUTPUT ACCEPT
iptables -t mangle -F
iptables -t mangle -X
iptables -t mangle -P PREROUTING ACCEPT
iptables -t mangle -P INPUT ACCEPT
iptables -t mangle -P FORWARD ACCEPT
iptables -t mangle -P OUTPUT ACCEPT
iptables -t mangle -P POSTROUTING ACCEPT
iptables -F
iptables -X
iptables -P FORWARD ACCEPT
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -t raw -F
iptables -t raw -X
iptables -t raw -P PREROUTING ACCEPT
iptables -t raw -P OUTPUT ACCEPT