Linux Apache服务器系统的设置与优化（13）

一、安装

http://www.hyperspacecommunications.com/products/mod_gzip.html

页面上有 mod_gzip 的二进制码版本和源码下载。如果你使用前者的话，直接把文件拷贝到 Apache Home 的 libexec 目录下就可以了。下载 mod_gzip.c 后，如果你的 Apache 用 DSO 模式安装的话，用下面简单的命令就可以安装了：

# /www/bin/apxs -i -a -c mod_gzip.c

二、配置

安装完毕以后把下列配置加入httpd.conf ：

# mod_gzip 配置

LoadModule gzip_module libexec/mod_gzip.so

AddModule mod_gzip.c

mod_gzip_on Yes

mod_gzip_minimum_file_size 1002

mod_gzip_maximum_file_size 0

mod_gzip_maximum_inmem_size 60000

mod_gzip_item_include mime "application/x-httpd-php"

mod_gzip_item_include mime "text/*"

# 压缩 Zope 的内容：

mod_gzip_item_include file "[^.]*$"

mod_gzip_item_include mime "httpd/unix-directory"

mod_gzip_dechunk Yes

mod_gzip_temp_dir "/tmp"

mod_gzip_keep_workfiles No

mod_gzip_item_include file "\.php$"

mod_gzip_item_include file "\.txt$"

mod_gzip_item_include file "\.html$"

mod_gzip_item_exclude file "\.css$"

mod_gzip_item_exclude file "\.js$"

并添加下面的行：

LogFormat "％h ％l ％u ％t \"％r\" ％>;s ％b \"％{Referer}i\" \"％{User-Agent}i\" mod_gzip: ％{mod_gzip_compression_ratio}npct." mod_gzip

把对应虚拟主机配置中的日志文件参数修改为 mod_gzip

三、压缩效果

这样，我们得到类似以下的日志文件：

61.169.41.13 - - [02/Mar/2002:01:24:29 -0500] "GET /pipermail/freelamp/2002-March/000026.html HTTP/1.1" 200 72848 "http://www.freelamp.com/pipermail/freelamp/2002-March/subject.html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461; NetCaptor 6.5.0)" mod_gzip: 54pct.

61.169.41.13 - - [02/Mar/2002:01:24:52 -0500] "GET /new/publish/1003233602/index_html HTTP/1.1" 200 4304 "http://www.freelamp.com/new/publish/search?subject=Zope&op=articles" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461; NetCaptor 6.5.0)" mod_gzip: 65pct.

61.169.41.13 - - [02/Mar/2002:01:24:53 -0500] "GET /new/publish/global_css HTTP/1.1" 200 629 "http://www.freelamp.com/new/publish/1003233602/index_html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461; NetCaptor 6.5.0)" mod_gzip: 73pct.

61.169.41.13 - - [02/Mar/2002:01:24:54 -0500] "GET /new/publish/Images/sitetitle_img HTTP/1.1" 304 0 "http://www.freelamp.com/new/publish/1003233602/index_html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461; NetCaptor 6.5.0)" mod_gzip: 0pct.

61.169.41.13 - - [02/Mar/2002:01:26:21 -0500] "GET /new/publish/index_html HTTP/1.1" 200 7317 "http://www.freelamp.com/new/publish/1003233602/index_html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461; NetCaptor 6.5.0)" mod_gzip: 80pct.

61.169.41.13 - - [02/Mar/2002:01:26:22 -0500] "GET /new/publish/global_css HTTP/1.1" 200 629 "http://www.freelamp.com/new/publish/index_html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461; NetCaptor 6.5.0)" mod_gzip: 73pct.

61.169.41.13 - - [02/Mar/2002:01:26:24 -0500] "GET /new/publish/TopicImages/Tutorial HTTP/1.1" 304 0 "http://www.freelamp.com/new/publish/index_html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461; NetCaptor 6.5.0)" mod_gzip: 0pct.

61.169.41.13 - - [02/Mar/2002:01:26:24 -0500] "GET /new/publish/LinkImages/jsp001_img HTTP/1.1" 304 0 "http://www.freelamp.com/new/publish/index_html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461; NetCaptor 6.5.0)" mod_gzip: 0pct.

我们看到 mod_gzip 已经对 .html 和那些没有点的文件作了压缩，压缩率达到了 70-80％。但是，mod_gzip 对图片文件不作压缩。

四、总结

结合，mod_gzip 和缓冲工具等，我们完全可以使一台配置较低的 PC 有足够的能力处理各种 HTML/CGI 等的请求。