CentOS7.4 关闭firewall防火墙，改用iptabl

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）</span>

2.开启iptables

<span style="font-size:18px;">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</span>

3.编辑防火墙文件（开启了21,22,80,3306端口）

vim /etc/sysconfig/iptables

# sampleconfigurationforiptables service

# # you can edit thismanuallyoruse system-config-firewall

# # pleasedonotaskustoadd additional ports/servicestothisdefaultconfiguration

*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 --stateNEW-m tcp --dport21-j ACCEPT

-A INPUT -p tcp -m state --stateNEW-m tcp --dport22-j ACCEPT

-A INPUT -p tcp -m state --stateNEW-m tcp --dport80-j ACCEPT

-A INPUT -p tcp -m state --stateNEW-m tcp --dport3306-j ACCEPT

-A INPUT -j REJECT --reject-withicmp-host-prohibited

-A FORWARD -j REJECT --reject-withicmp-host-prohibited

COMMIT </span>

5.查看本机关于IPTABLES的设置情况

<span style="font-size:18px;">iptables -L -n</span>