mod_evasive 是Apache服务器的防CC攻击的一个模块,它可以检测和限制同个IP的请求次数,达到一定条件时执行命令(如使用iptables封禁IP),虽然并不能完全防御CC攻击,但在一定条件下能起到缓解Apache服务器的压力。

1)预安装:

yum install httpd-devel

2)获得mod_evasive,解压,安装。

cd /usr/src
wget http://www.zdziarski.com/blog/wp-content/uploads/2010/02/mod_evasive_1.10.1.tar.gz
tar xzf mod_evasive_1.10.1.tar.gz
cd mod_evasive
/usr/sbin/apxs -cia mod_evasive20.c

3)添加配置文件
vi /etc/httpd/conf/httpd.conf,在LoadModule evasive20_module /usr/lib/apache/mod_evasive20.so下面添加引用httpd-evasive.conf文件。

LoadModule evasive20_module /usr/lib/apache/mod_evasive20.so
Include /etc/httpd/conf/extra/httpd-evasive.conf

httpd-evasive.conf文件的内容如下:

<IfModule mod_evasive20.c>
DOSHashTableSize 3097(哈希表大小,无需修改)
DOSPageCount 2(允许单IP的最大并发连接(瞬间值)
DOSSiteCount 50(允许单台机在指定秒数内访问同一页的次数)
DOSPageInterval 1 单页请求检测时间(默认1秒)
DOSSiteInterval 1 全站请求检测时间(默认1秒)
DOSBlockingPeriod 3600 黑名单封禁时间(默认3600秒)
DOSEmailNotify someone@somewhere.com有新黑名单记录通知管理员
DOSSystemCommand “iptables -A INPUT -s %s -j DROP” 进黑名单执行命令
</IfModule>

4)重启apache

/etc/init.d/httpd restart

教程参考

1、https://library.linode.com/web-servers/apache/mod-evasive

2、http://www.kwx.gd/CentOSApp/CentOS-DA-mod-evasive.html

3、mod_evasive官方博客http://www.zdziarski.com/blog/?page_id=442

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