cnetOS7 防火墙配置

firewall

1. 查看firewall开放端口

firewall-cmd --list-ports
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2. 开启端口

firewall-cmd --zone=public --add-port=80/tcp --permanent
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3. 命令含义

–zone #做用域

–add-port=80/tcp #添加端口，格式为：端口/通信协议

–permanent #永久生效，没有此参数重启后失效
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4. 重启防火墙

firewall-cmd --reload #重启firewall
systemctl stop firewalld.service #中止firewall
systemctl disable firewalld.service #禁止firewall开机启动
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iptables

1. 禁用/中止自带的firewalld服务

#中止firewalld服务
systemctl stop firewalld
#禁用firewalld服务
systemctl mask firewalld
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2. 安装iptables防火墙

#安装
yum install iptables-services

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3. 编辑防火墙配置文件

vi /etc/sysconfig/iptables
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# sample configuration for iptables service
# you can edit this manually or use system-config-firewall
# please do not ask us 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 22 -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 20 -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！退出
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4. 设置

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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