最後更新: 2015-04-16

介紹

Homepage: http://bwmod.sf.net

支援 mpm, prefork

用圖

* restrict the top speed a site is able to use
* restrict the max connections allowed per site

Install

mod_bw 可以在 epel repos download 到

yum install mod_bw

安裝後有以下 file

• /usr/lib/httpd/modules/mod_bw.so
• /etc/httpd/conf.d/mod_bw.conf

原理

1. set a shared memory holding all of the configuration
2. keep a "count" of the info currently using (shared memory)
3. the mod will "split" the data, and will send it piece by piece (delay between pieces)

設定

/etc/httpd/conf.d/mod_bw.conf

# mod_bw 不支援 Global setting 的, 所以這 file 不用放設定
LoadModule bw_module modules/mod_bw.so

Per vhost setting

<VirtualHost *>

    # 啟用此 module, Default Off
    BandWidthModule On

    # On => The mod will catch every request.(Default: Off)
    #ForceBandWidthModule Off
    #AddOutputFilterByType BW_MOD text/html text/plain
    # 由於唔想煩, 所以直接 On 了它 (P.S. 放在 Global 係無效的)
    
    ForceBandWidthModule On

    # BandWidth [From] [bytes/s]
    # From: 192.168.0.0/24 or all
    # First entries("From") have precedence
    # 0 => no limit.

    BandWidth all 102400000

    # MaxConnection [From] [Max]
    # ***  You NEED to have a BandWidth limit for the same origin.
    # (It's because im using them same memory space)

    MaxConnection all 20

    # value>0 每個 client 會平分 "BandWidth", 當不夠分時都保證最少有 value
    # value=0 => 當不夠分時, 會用 default valuse (256 bytes/s)
    # value=-1 => 每個 client fix 死有 "BandWidth"

    MinBandWidth all 50000

    # At default, when "MaxConnection" is reached, the mod will issue a 503(Service Temporarily Unavailable)

    BandWidthError 510
    ErrorDocument 510 /Path/To/ErrDoc.html

    <Directory /home/vhosts/mywebsite/web>
       # LargeFileLimit [Type] [Minimum Size(kbyte)] [bytes/s]
       # Type = * to match all
       # This limits .avi files over (or equal to) 500kb to 10kbytes/s
       # LargeFileLimit .avi 500 10240
       LargeFileLimit * 1024 102400
    </Directory>
</VirtualHost>

mini configure

BandwidthModule On
ForceBandWidthModule On
Bandwidth all 102400
MinBandwidth all 40960
MaxConnection all 3

BandWidthError 510
ErrorDocument 510 "Your website over connection limit. Please contact server admin."

DOC

http://bwmod.sourceforge.net/files/mod_bw-0.7.txt

Other

• mod_bandwidth
• mod_cband