测试环境：普通PC机+RedHat linux As4+Squid 2.5
以下分别采用了3种不同的模式在测试平台下对网站进行加速，原理：用户请求-〉DNS解析到Squid-Cache-〉Squid-Cache通过本地hosts进行解析-〉Web服务器（如果没有缓存）-〉Squid-Cache服务器-〉用户. 详细配置文档如下：
一、 Squid网路拓扑
二、 配置步骤
Setp 1 – Download file and compiling Squid
1. 首先卸载自带的squid程序，使用命令如下
#rpm –q squid #检测是否已安装了squid
# rpm –e squid全文件名 #卸载系统自带已安装上的squid
2.下载最新稳定版squid以及编译安装
Address: [url]http://www.squid-cache.org/Version ... -2.5.STABLE13.tar.gz[/url]
# tar zxvf squid-2.5.STABLE13.tar.gz
# cd squid-2.5.STABLE13
# vi config.sh #新建此配置文件
#!/bin/bash
SQUID_ROOT="/Data/apps/squid"
./configure --prefix=$SQUID_ROOT \
--enable-useragent-log \
--enable-referer-log \
--enable-default-err-language=Simplify_Chinese \
--enable-err-languages="Simplify_Chinese English" \
--disable-internal-dns #停止本地的dns解析
# sh config.sh
# make
# make install
Setp 2 – Basic Configuration
# cd /Data/apps/squid/
# mkdir cache
# chown squid.squid *
# chmod 777 -R var #目的是为了增加日志文件的写入权限
Setp 3 –Particular Configuration
# cd /Data/apps/squid/etc
# mv squid.conf squid.conf.bak #备份原文件
# vi squid.conf #新建文件
A. 模式1：Squid对应多台web服务器
A1.在vi /etc/hosts中：加入内部的DNS解析，比如：
192.168.0.9 [url]www.5538.com[/url]
192.168.0.66 bbs.5538.com
A2.#vi /Data/apps/squid/etc/squid.conf
# visible name
visible_hostname cache.5538.com
# cache config: space use 1G and memory use 256M
cache_dir ufs /Data/apps/squid/cache 1024 16 256
cache_mem 256 MB
cache_effective_user squid #设置运行时的用户和组权限
cache_effective_group squid
http_port 80 # squid监听的端口,客户访问网站的端口
httpd_accel_host virtual # WEB服务器的IP地址,此模式下设置为:virtual
httpd_accel_single_host off # 设置on时缓冲请求到单台Server，off对应virtual
httpd_accel_port 80 # WEB服务器的端口(对于多台web服务器,端口必须一致)
httpd_accel_uses_host_header on # 完成多个WEB服务器的反向代理功能
httpd_accel_with_proxy off # 停用代理本地上网
# accelerater my domain only
acl acceleratedHostA dstdomain [url]www.5538.com[/url]
acl acceleratedHostB dstdomain bbs.5538.com
# accelerater http protocol on port 80
acl acceleratedProtocol protocol HTTP
acl acceleratedPort port 80
# access arc
acl all src 0.0.0.0/0.0.0.0
# Allow requests when they are to the accelerated machine
AND to the right port with right protocol
http_access allow acceleratedProtocol acceleratedPort
acceleratedHostA
http_access allow acceleratedProtocol acceleratedPort
acceleratedHostB
http_access allow all
# logging
emulate_httpd_log on
cache_store_log none
# manager
acl manager proto cache_object
http_access allow manager all
cachemgr_passwd pass all
cache_mgr admin@5538.com
#swap 性能微调
half_closed_clients off
cache_swap_high 100%
cache_swap_low 95%
maximum_object_size 1024 KB
# 控制对象的超时时间 (S_Data-Data)<Min+(Max-Min)*90%
refresh_pattern -i .html 60 90% 10080 reload-into-ims
#refresh_pattern -i \.html$ 60 90% 10080 reload-into-ims
refresh_pattern -i .png 60 90% 10080 reload-into-ims
refresh_pattern -i .jpg 1440 90% 129600 reload-into-ims
refresh_pattern -i .gif 1440 90% 129600 reload-into-ims
refresh_pattern -i .js 1440 90% 10080 reload-into-ims
refresh_pattern -i .swf 1440 90% 129600 reload-into-ims
refresh_pattern -i .bmp 1440 90% 129600 reload-into-ims
# refresh_pattern -i .shtml 1440 90% 129600 reload-into-ims
# refresh_pattern -i .hml 1440 90% 129600 reload-into-ims
