CentOS7.4 关闭firewall防火墙,改用iptables

1.关闭默认的firewall防火墙

systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
firewall-cmd --state #查看默认防火墙状态(关闭后显示notrunning,开启后显示running)

2.开启iptables

yum install iptables (根据centOS7的版本和内核,有些版本已经装过,可以跳过此命令)
yum install iptables-services
service iptables restart
chkconfig iptables on或者systemctl enable iptables.service开机自启

3.编辑防火墙文件(开启了21,22,80,3306端口)

vim /etc/sysconfig/iptables

# sampleconfiguration for iptables service
# # you can edit thismanually or use system-config-firewall
# # please do not askus 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 21 -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 80 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

5.查看本机关于IPTABLES的设置情况

iptables -L -n
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