linux下安装mod_evasitive模块（防止单一客户的DOS攻击）

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本文介绍了如何在Apache服务器上安装mod_evasitive模块，并详细解释了安装步骤、配置过程及测试方法。

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安装步骤如下：

1. 前提条件

已经安装了Apache 2.2.x或以上版本，下载mod_evasitive。

下载地址：

http://www.zdziarski.com/blog/wp-content/uploads/2010/02/mod_evasive_1.10.1.tar.gz

2. 安装

按照下列指令安装mod_evasitive.

    tar -xzvf mod_evasive_1.10.1.tar.gz
    cd mod_evasitive
    vim mod_evasive20.c

#define MAILER  "/bin/mail -t %s"
#define  LOG( A, ... ) { openlog("mod_evasive", LOG_PID, LOG_DAEMON); syslog( A, __VA_ARGS__ ); closelog(); }


#define DEFAULT_HASH_TBL_SIZE   3079ul  // Default hash table size
#define DEFAULT_PAGE_COUNT      2       // Default max page hit count/interval
#define DEFAULT_SITE_COUNT      50      // Default max site hit count/interval
#define DEFAULT_PAGE_INTERVAL   1       // Default 1 second page interval
#define DEFAULT_SITE_INTERVAL   1       // Default 1 second site interval
#define DEFAULT_BLOCKING_PERIOD 10      // Default block time (Seconds)
#define DEFAULT_LOG_DIR         "/tmp"     //根据需要修改

  #修改日志路径参数
    /usr/local/apache2/bin/apxs -i -a -c ./mod_evasive20.c

安装成功的信息：

chmod 755 /usr/local/apache2//modules/mod_evasive20.so
....

3 配置并测试

编辑http.conf 文件：

vim /etc/local/apache2/conf/http.conf
#添加mod_evasitive配置参数
LoadModule evasive20_module   modules/mod_evasive20.so


#------------mod_evasive module settings-------------------
<IfModule mod_evasive20.c>
    DOSHashTableSize    6195
    DOSSiteCount        50
    DOSPageCount        2
    DOSPageInterval     1
    DOSSiteInterval     1
    DOSBlockingPeriod   10
    DOSLogDir           "/usr/local/apache2/logs"
    #
    DOSWhiteList 127.0.0.1
    DOSWhiteList 127.0.0.*
</IfModule>

保存后，重新启动Apache。

可以使用Apache自带的工具ab，也可以使用mod_evasitive提供的测试脚本test.pl。

在另外一台机器上，运行脚本test.pl.

[app@machine-2 mod_evasive]$ perl test.pl
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden
HTTP/1.1 403 Forbidden

从上面的信息，可以知道mod_evasitive 模块配置成功。