Centos8 运行service iptables status 时报错!
[root@dsjdasdjs]# service iptable status
Redirecting to /bin/systemctl status iptable.service
Unit iptable.service could not be found. 如下图:

Centos8默认防火墙是firewalld,而不是iptables
解决方法如下 :
yum install iptables-services
service 方式操作
service iptables stop //停止防火墙---即时生效
service iptables start //启动防火墙---即时生效
service iptables restart //
chkconfig iptables off //永久关闭防火墙
chkconfig iptables on //永久关闭后重启
建议:
systemctl status firewalld //查看防火墙状态
systemctl start firewalld //启动firewall
systemctl stop firewalld //停止firewall
systemctl disable firewalld //禁止firewall开机启动
systemctl enable firewalld //开机启动

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