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centos 7.0預設使用的是firewall作為防火牆，這裡改為iptables防火牆。
1、關閉firewall：
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall開機啟動
2、安裝iptables防火牆
yum install iptables-services #安裝
vi /etc/sysconfig/iptables #編輯防火牆配置檔案
# 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! #儲存退出
systemctl restart iptables.service #最後重啟防火牆使配置生效
systemctl enable iptables.service #設定防火牆開機啟動
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CentOS 7 0，啟用iptables防火牆
centos 7.0預設使用的是firewall作為防火牆，這裡改為iptables防火牆。1 關閉firewall systemctl stop firewalld.service 停止firewall systemctl disable firewalld.service 禁止firewall開...
CentOS 7 0，啟用iptables防火牆
centos 7.0預設使用的是firewall作為防火牆，這裡改為iptables防火牆。1 關閉firewall systemctl stop firewalld.service 停止firewall systemctl disable firewalld.service 禁止firewall開...
CentOS 7 0，啟用iptables防火牆
centos 7.0預設使用的是firewall作為防火牆，這裡改為iptables防火牆。1 關閉firewall systemctl stop firewalld.service 停止firewall systemctl disable firewalld.service 禁止firewall開...