centos7.3默认使用的防火墙应该是firewall,而不是iptables。而我们xxmj服务器使用的是iptables防火墙。所以,在配置防火墙之前,我们需要先关闭firewall,安装iptables。
1.关闭firewall
service firewalld stop
systemctl disable firewalld.service #禁止firewall开机启动
2.安装iptables防火墙
yum install iptables-services
3.编辑iptables防火墙配置
vi /etc/sysconfig/iptables #编辑防火墙配置文件
下边是一个完整的配置文件:
Firewall configuration written by system-config-firewall
Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
:wq! #保存退出
4.开启iptables
service iptables start #开启
systemctl enable iptables.service #设置防火墙开机启动