Apache mod_qos模块安装与配置

1.下载qos模块：wget http://jaist.dl.sourceforge.net/project/mod-qos/mod_qos-10.26.tar.gz

2.解压：tar -zxvf mod_qos-10.26.tar.gz

3.安装

cd mod_qos-10.26

cd apache2/

/usr/local/apache2/bin/apxs -i -c mod_qos.c

输出：

/usr/local/apache2/build/libtool --silent --mode=compile gcc -std=gnu99 -prefer-pic   -DLINUX=2 -D_REENTRANT -D_GNU_SOURCE -g -O2 -pthread -I/usr/local/apache2/include  -I/usr/local/apache2/include   -I/usr/local/apache2/include   -c -o mod_qos.lo mod_qos.c && touch mod_qos.slo
/usr/local/apache2/build/libtool --silent --mode=link gcc -std=gnu99    -o mod_qos.la  -rpath /usr/local/apache2/modules -module -avoid-version    mod_qos.lo
/usr/local/apache2/build/instdso.sh SH_LIBTOOL='/usr/local/apache2/build/libtool' mod_qos.la /usr/local/apache2/modules
/usr/local/apache2/build/libtool --mode=install install mod_qos.la /usr/local/apache2/modules/
libtool: install: install .libs/mod_qos.so /usr/local/apache2/modules/mod_qos.so
libtool: install: install .libs/mod_qos.lai /usr/local/apache2/modules/mod_qos.la
libtool: install: install .libs/mod_qos.a /usr/local/apache2/modules/mod_qos.a
libtool: install: chmod 644 /usr/local/apache2/modules/mod_qos.a
libtool: install: ranlib /usr/local/apache2/modules/mod_qos.a
libtool: finish: PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/sbin" ldconfig -n /usr/local/apache2/modules
----------------------------------------------------------------------
Libraries have been installed in:
   /usr/local/apache2/modules

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,-rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
chmod 755 /usr/local/apache2/modules/mod_qos.so

4.配置

配置Apache httpd.conf

加入一行：LoadModule qos_module   modules/mod_qos.so

编辑配置 qos.conf

加入如下内容：

# maximum number of active TCP connections is limited to 896 (limited
# by the available memory, adjust the settings according to the used
# hardware):
MaxClients               896

# idle timeout:
Timeout                  20

# keep alive (for up to 85% of all connections):
KeepAlive                on
MaxKeepAliveRequests     60
KeepAliveTimeout         3
QS_SrvMaxConnClose       85%

# name of the HTTP response header which marks preferred clients (this
# may be used to let the application decide which clients are "good" and
# have higher privileges, e.g. authenticated users. you may also use
# the QS_VipUser directive when using an Apache authentication module such
# as mod_auth_basic or mod_auth_oid):
QS_VipIPHeaderName       mod-qos-login

# enables the known client prefer mode (server allows new TCP connections
# from known/good clients only when is has more than 716 open TCP connections):
QS_ClientPrefer          80

# minimum request/response speed (deny slow clients blocking the server, 
# e.g. defending slowloris) if the server has 500 or more open connections:
QS_SrvMinDataRate        120 1500 500

# and limit request line, header and body:
LimitRequestLine         7168
LimitRequestFields       30
QS_LimitRequestBody      102400

# don't allow more than 30 TCP connections per client source address if
# 500 connections are open to the server:
QS_SrvMaxConnPerIP       30 500

# block clients violating some basic rules frequently (don't allows more than 20
# violations within 5 minutes):
QS_ClientEventBlockCount 20 300
QS_SetEnvIfStatus        400               QS_Block
QS_SetEnvIfStatus        401               QS_Block
QS_SetEnvIfStatus        403               QS_Block
QS_SetEnvIfStatus        404               QS_Block
QS_SetEnvIfStatus        405               QS_Block
QS_SetEnvIfStatus        406               QS_Block
QS_SetEnvIfStatus        408               QS_Block
QS_SetEnvIfStatus        411               QS_Block
QS_SetEnvIfStatus        413               QS_Block
QS_SetEnvIfStatus        414               QS_Block
QS_SetEnvIfStatus        417               QS_Block
QS_SetEnvIfStatus        500               QS_Block
QS_SetEnvIfStatus        503               QS_Block
QS_SetEnvIfStatus        505               QS_Block
QS_SetEnvIfStatus        QS_SrvMinDataRate QS_Block
QS_SetEnvIfStatus        NullConnection    QS_Block
在Apache httpd.conf中加入一行：Include conf/qos.conf导入qos配置

重启Apache，报错：Invalid command 'QS_SrvMinDataRate', perhaps misspelled or defined by a module not included in the server configuration
暂时解决方式：将此命令注释。
另外，有两个警告：
AH00513: WARNING: MaxRequestWorkers of 896 is not an integer multiple of
 ThreadsPerChild of 25, decreasing to nearest multiple 875,
 for a maximum of 35 servers.
AH00515: WARNING: MaxRequestWorkers of 875 would require 35 servers and 
 would exceed ServerLimit of 16, decreasing to 400.
 To increase, please see the ServerLimit directive
解决方式：将MaxClients 改为400.
重启Apache。
其中QS_SrvMinDataRate 命令会由于兼容性与Apache 2.4的有冲突，注释掉该命令，及与其相关的命令。
Apache的错误日志中会有提示，qos只适用于Apache 2.2版本。经过测试其他不冲突的命令也可以正常运行。