1.关闭firewall
systemctl stop firewalld.service
2.禁止firewall开机启动
systemctl disable firewalld.service
3.先检查是否安装了iptables
service iptables status
4.安装iptables
yum install -y iptables
5.升级iptables
yum update iptables
6.安装iptables-services
yum install iptables-services
7.查看iptables对外开放了哪些端口
iptables -L -n
8.修改iptables配置
vi /etc/sysconfig/iptables
#开放端口
-A INPUT -m state --state NEW -m tcp -p tcp --dport XXXX -j ACCEPT
-A OUTUT -m state --state NEW -m tcp -p tcp --dport XXXX -j ACCEPT
9.重启iptables使配置生效
systemctl restart iptables.service
systemctl enable iptables.service
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