应用环境：一台智能DNS，一台web做原始服务器，三台squid做web镜像，三台squid分别在重庆，上海，天津，web在深圳，智能dns能分析客户访问接入的IP然后叫其访问本城市的服务器，比如说上海的客户访问的就是上海的web镜像，然后第二次访问的时候首先是向其他两台squid发起请求看有没有这个缓存，如果没有在向web发起请求
系统环境：CentOS 5.2，squid-3.1.0.13.tar.gz，其中web服务器是LAMP环境，域名为www.qubaoquan.com
IP和域名规划：智能DNS的ip为192.168.10.100，web服务器的IP为192.168.10.1，上海squid的IP为：192.168.10.2，重庆squid的IP为：192.168.10.3，天津squid的IP为：192.168.10.4，对外提供的域名为www.qubaoquan.com
如下的的配置是上海的squid的配置，其他两台squid只要做些响应更改就可以了
1. 安装
[root@squid srv]# tar zvxf squid-3.1.0.13.tar.gz
[root@squid srv]# cd squid-3.1.0.13
[root@squid srv]# ./configure --prefix=/usr/local/squid --enable-storrio=ufs,aufs,null --enable-linux-netfilter
[root@squid srv]# make
[root@squid srv]# make install
2. 创建运行squid的用户
[root@squid srv]# useradd squid
3. 创建运行所需的目录并且赋权
[root@squid srv]# mkdir -p /usr/local/squid/cache
[root@squid srv]# chown -R squid:squid /usr/local/squid/cache/
[root@squid srv]# mkdir -p /var/run/squid/
[root@squid srv]# chown -R squid:squid /var/run/squid/
[root@squid srv]# mkdir -p /var/log/squid
[root@squid srv]# chown -R squid:squid /var/log/squid
4. 编辑主配置文件
[root@squid srv]# cd /usr/local/squid/etc/
[root@squid etc]# mv squid.conf squid.conf.bak
[root@squid etc]# vi squid.conf（内容如下）
############# basic setting ###############
visible_hostname 192.168.10.2
pid_filename /var/run/squid/squid.pid
dns_nameservers 192.168.10.100
############# log config ###############
cache_access_log /var/log/squid/access.log
cache_log /var/log/squid/cache.log
cache_store_log none
#========> log format <===============
logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st"%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
#====================#
logfile_rotate 24
emulate_httpd_log on //使日志和Apache的格式相似
debug_options ALL,2 //debuge级别
############# acl setting ###############
acl all src 0.0.0.0/0.0.0.0
http_access allow all
############ timeout setting ############
connect_timeout 1 minute
peer_connect_timeout 30 seconds
request_timeout 2 minutes
persistent_request_timeout 1 minute
############# admin setting #############
cache_mgr quxinrao@163.com
############# cache setting #############
cache_dir ufs /usr/local/squid/cache 4096 16 256
cache_mem 125 MB
cache_swap_low 90
cache_swap_high 95
maximum_object_size 32768k
minimum_object_size 2k
maximum_object_size_in_memory 256 KB
cache_replacement_policy lru
memory_replacement_policy lru
cache_effective_user squid
cache_effective_group squid
#=========> dns reslove cache <========
ipcache_size 1024
ipcache_low 90
ipcache_high 95
fqdncache_size 1024
#==========> no cached <==========
hierarchy_stoplist cgi-bin ?
hierarchy_stoplist -i ^https:\\ ?
acl QUERY urlpath_regex -i cgi-bin \? \.asp \.php \.jsp \.cgi
acl denyssl urlpath_regex -i ^https:\\
no_cache deny QUERY
no_cache deny denyssl
#==========> Expires setting <=============
refresh_pattern -i \.gif$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.jpg$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.png$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.bmp$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.jpeg$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.mp3$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.wmv$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.rm$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.swf$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.mpeg$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.wma$ 1440 50% 2880 ignore-reload
refresh_pattern -i \.css$ 10 50% 60 reload-into-ims
refresh_pattern -i \.js$ 10 50% 60 reload-into-ims
refresh_pattern -i \.xml$ 10 50% 30 reload-into-ims
############# porxy setting #############
http_port 80 accel vhost vport
icp_port 3130
cache_peer 192.168.10.1 parent 80 3310 no-query round-robin max-conn=32 originserver name=qubaoquan
cache_peer_domain qubaoquan www.qubaoquan.com
#==========> forword cyclic <=============
#acl fromneighbor src 192.168.168.5
#cache_peer_access 192.168.168.5 deny fromneighbor
#==========> neighbor setting <=============
cache_peer 192.168.10.3 sibling 80 3310
cache_peer 192.168.10.4 sibling 80 3310
#==========> ICP contorl <=============
acl N1 src 192.168.10.3
acl N2 src 192.168.10.4
acl ALL src 0.0.0.0/0.0.0.0
icp_access allow N1
icp_access allow N2
icp_access deny ALL
############# old version setting ###########
#httpd_accel_single_host off
#httpd_accel_host 221.122.76.96
#httpd_accel_port 80
#httpd_accel_with_proxy on
#httpd_accel_user_host_header on
############### other setting ##########
forwarded_for off
coredump_dir /usr/local/squid/var/cache
quick_abort_min 16 KB
quick_abort_max 16 KB
quick_abort_pct 95
error_directory /usr/local/squid/share/errors/en-us/
5. 创建启动脚本并且注册为系统服务
[root@squid ~]# vi /etc/init.d/squid（内容如下）
#!/bin/bash
# chkconfig: - 90 25
# description: Squid
case "$1" in
start)
if [ -f /var/run/squid/squid.pid ]
then
echo " the squid serve is running now,please stop it fisrt!"
else
/usr/local/squid/sbin/squid -s
fi
;;
stop)
rm -rf /var/run/squid/squid.pid
killall -9 squid
;;
status)
if [ -f /var/run/squid/squid.pid ]
then
echo " the squid serve is running now"
else
echo " the squid serve not running now"
fi
;;
restart)
# rm -rf /var/run/squid/squid.pid
#killall -9 squid
#/usr/local/squid/sbin/squid -s
e a
echo b
echo c
;;
Esac
[root@squid ~]# chmod +x /etc/init.d/squid
[root@squid ~]# chkconfig --add squid
[root@squid ~]# chkconfig --levels 2345 squid on
6. 启动服务
[root@squid ~]# service squid start
7. 测试：在一台测试机上把域名www.qubaoquan.com绑定到192.168.10.2上，然后再浏览器访问：www.qubaoquan.com就会出现192.168.10.1上面的web页面
8. 查看缓存命中率的方法：[root@squid ~]# /usr/local/squid/bin/squidclient -p 80 mgr:info
