Centos7.0 修改防火牆為iptables
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