默认CentOS7上安装的防火墙是firewalld。很多从centos6.X切换过来的用户都不习惯。
我们可以将firewalld改成iptables。操作如下：
1、关闭firewall：
# systemctl stop firewalld.service
# systemctl disable firewalld.service
2、安装iptables防火墙
# yum install iptables-services
vi /etc/sysconfig/iptables #编辑防火墙配置文件
# 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
#保存退出
# systemctl restart iptables.service #最后重启防火墙使配置生效
# systemctl enable iptables.service #设置防火墙开机启动
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