CentOS7中使用iptables

一、關閉firewall：

systemctl stop firewalld.service #中止firewall
systemctl disable firewalld.service #禁止firewall開機啓動

二、安裝iptables防火牆

#安裝
yum install iptables-services

三、編輯防火牆配置文件

vi /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 ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
 
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 21 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 20 -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    

 

四、重啓iptables並設置開機啓動

systemctl restart iptables.service #最後重啓防火牆使配置生效
 
systemctl enable iptables.service #設置防火牆開機啓動

五、關閉SELINUX

#SELINUX=enforcing #註釋掉
#SELINUXTYPE=targeted #註釋掉
SELINUX=disabled #增長

六、若是是當即生效則是：

setenforce 0 #使配置當即生效