在CentOS7中，防火墙iptables被firewalld取代。但为了使用习惯，还是喜欢把防火墙改回iptables。

[root@localhost ~]# systemctl stop firewalld ##停止防火墙 firewalld
[root@localhost ~]# systemctl disable firewalld ##禁用防火墙 firewalld
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
[root@localhost ~]# systemctl status firewalld ##查看防火墙状态

20170705090710352.png

防火墙 firewalld 关闭成功

接下来就是启用iptables了，安装iptables相关组件

[root@localhost ~]# yum install -y iptables-services iptables-devel.x86_64 iptables.x86_64

[root@localhost ~]# systemctl enable iptables ##启用iptables

20170705091645694.png

[root@localhost ~]# systemctl start iptables ##启动iptables
[root@localhost ~]# systemctl status iptables ##查看iptables状态

20170705092000489.png

测试：

20170705092111527.png

iptables启用成功。

转自：https://blog.csdn.net/lqy461929569/article/details/74370396