iptables命令详解

安装iptables

yum install iptables-services

编写允许访问的策略

vim /etc/sysconfig/iptables

# sample configuration for iptables service
# # # you can edit this manually or use system-config-firewall
# # # please do not ask us to add additional ports/services to this default configuration
*filter
:INPUT DROP [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -s 0.0.0.0/0 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -s 0.0.0.0/0  -p tcp -m tcp --dport 8080 -j ACCEPT
-A INPUT -s 10.10.11.0/24  -p tcp -m tcp --dport 8001 -j ACCEPT

-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
COMMIT

禁止firewall开机启动

systemctl disable firewall.service

启动

systemctl start iptables

更多：
https://www.cnblogs.com/chinaifae/p/9993283.html

重启

systemctl restart iptables

禁用

systemctl stop iptables

查看状态

systemctl status iptables

所有节点确保防火墙关闭

systemctl stop firewalld
systemctl disable firewalld

检查防火墙状态

firewall-cmd --state

关闭规则

systemctl stop iptables
systemctl disable iptables
systemctl status iptables