操作系统：CentOS 7.x

准备篇

一、防火墙配置

CentOS 7.x默认使用的是firewall作为防火墙，这里改为iptables防火墙。

1、关闭firewall：

systemctl stop firewalld.service #停止firewall

systemctl disable firewalld.service #禁止firewall开机启动

systemctl mask firewalld

systemctl stop firewalld

yum remove firewalld

2、安装iptables防火墙

yum install iptables-services #安装

vi /etc/sysconfig/iptables #编辑防火墙配置文件

# 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 80 -j ACCEPT

-A INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT

-A INPUT -j REJECT --reject-with icmp-host-prohibited

-A FORWARD -j REJECT --reject-with icmp-host-prohibited

COMMIT

:wq! #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

/usr/libexec/iptables/iptables.init restart #重启防火墙

二、关闭SELINUX

vi /etc/selinux/config

#SELINUX=enforcing #注释掉

#SELINUXTYPE=targeted #注释掉

SELINUX=disabled #增加