1.1安装squid软件
在新服务器上安装squid软件。
操作系统：centOS 5.5
软件信息：squid-2.6.STABLE24.tar.gz
目的：使域名bj.abc.com转跳到www.abc.com
作用：起到加速作用。
2.1获得程序
从已经安装过squid的机器（11.11.11.11）获取软件版本信息。Squid –v
下载软件安装包：
wget http:#www.squid-cache.org/Versions/v2/2.6/squid-2.6.STABLE24.tar.gz
2.2 安装squid程序
cd /usr/local/
wget http:#www.squid-cache.org/Versions/v2/2.6/squid-2.6.STABLE24.tar.gz
tar -zxvf squid-2.6.STABLE24.tar.gz
cd squid-2.6.STABLE24
./configure --prefix=/usr/local/squid --enable-gnuregex --enable-icmp --enable-linux-netfilter --enable-default-err-language="Simplify_Chinese"
--enable-follow-x-forwarded-for --enable-storeio=aufs,ufs --enable-kill-parent-hack --enable-cache-digests --with-maxfd=65536 --with-pthreads --enabl
e-dlmalloc --enable-poll --enable-stacktraces --enable-removal-policies=heap,lru --enable-delay-pools
make
make install
useradd squid
groupadd squid
mkdir /var/log/squid #建立日志目录
chown squid:squid /var/log/squid #用户squid用户和组来运行squid
mkdir /var/spool/squid #建立squid缓存目录
chown squid:squid /var/spool/squid #同样，给权限
/usr/local/squid/sbin/squid -z #建立缓存目录
echo "/usr/local/squid/sbin/squid -Ds" >>/etc/rc.d/rc.local #添加开机启动
2.3 配置squid.conf配置文件
备份配置文件：
mv squid.conf squid.conf_bak
生成新的配置文件：
vi squid.conf
配置内容原文：
visible_hostname Cache_server
cache_mgr sysop@izptec.com
error_directory /usr/local/squid/share/errors/Simplify_Chinese
cache_dir aufs /usr/local/squid/var/cache 80000 16 256
maximum_object_size_in_memory 160 KB
store_avg_object_size 40 KB
cache_effective_user squid
cache_effective_group squid
negative_ttl 10 seconds
http_port 80 vhost vport
icp_port 0
redirect_children 128
redirect_rewrites_host_header off
redirector_bypass off
cache_peer www.abc.com parent 80 0 no-query round-robin originserver name=128
cache_peer_domain 128 bj.abc.com
acl all src 0.0.0.0/0.0.0.0
acl ControlCentre src 127.0.0.1 118.66.252.200
acl PURGE method PURGE
http_access allow PURGE ControlCentre
http_access deny PURGE
http_access allow all
emulate_httpd_log on
strip_query_terms off
refresh_pattern -i .*.(html|htm|js|css|swf|gif|GIF|JPG|jpg|jpeg|JPEG|flv|wmv|mp3|mp4|avi|rm) 2880 50% 5760 ignore-reload ignore-no-cache
logformat common %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st %Ss:%Sh
logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st "%ru" "%{User-Agent}>h"
logformat squid [%tl] %6tr %>a %Ss/%03Hs %<st %rm %ru %Sh/%<A %mt "%{Referer}>h" "%{User-Agent}>h"
access_log /usr/local/squid/var/logs/access.log squid
cache_log none
cache_store_log none
配置内容注解：
visible_hostname Cache_server # cache服务器的名称
cache_mgr sysop@izptec.com # 缓存管理员
error_directory /usr/local/squid/share/errors/Simplify_Chinese #定义错误日志语言为中文
cache_dir aufs /usr/local/squid/var/cache 80000 16 256 # cache目录和大小的设置
maximum_object_size_in_memory 160 KB
#squid内存最大存储对象为160 KB，超过这个值将不保存在内存，这个对squid加速效果影响比较大，有的人将这个设置为8KB而一般网站的图像都大于8KB，如果squid每次都从磁盘为外部请求提供文件，那么是很慢的。
store_avg_object_size 40 KB #squid 第一次缓冲数据的大小
cache_effective_user squid #squid用户
cache_effective_group squid #squid组
negative_ttl 10 seconds #将404错误，缓存时间设置为10
http_port 80 vhost vport # 监听80端口，并配置为加速模式
icp_port 0 # cache服务器之间通信的端口UDP
redirect_children 128
redirect_rewrites_host_header off # 禁止squid在使用重定向器时，更新请求的Host头部
redirector_bypass off #禁止重定向器在忙碌时跳出
cache_peer www.abc.com parent 80 0 no-query round-robin originserver name=128
#定义www.adbfp.com 为该squid的父节点并定义一个名称为128
cache_peer_domain 128 bj.abc.com
#定义父节点允许接受该squid对其发出的bj.adbfp.com请求
acl all src 0.0.0.0/0.0.0.0
acl ControlCentre src 127.0.0.1 118.66.252.200
acl PURGE method PURGE
http_access allow PURGE ControlCentre
http_access deny PURGE
http_access allow all
emulate_httpd_log on
strip_query_terms off
refresh_pattern -i .*.(html|htm|js|css|swf|gif|GIF|JPG|jpg|jpeg|JPEG|flv|wmv|mp3|mp4|avi|rm) 2880 50% 5760 ignore-reload ignore-no-cache
# -i 为忽略大小写
#ignore-reload: 忽略http的no-cache头，reload 头
#ignore-private: 忽略http的private头
#ignore-no-cache：忽略Pragma: no-cache和Cache-control：no-cache头
logformat common %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st %Ss:%Sh
logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st "%ru" "%{User-Agent}>h" #日志文件内容格式
logformat squid [%tl] %6tr %>a %Ss/%03Hs %<st %rm %ru %Sh/%<A %mt "%{Referer}>h" "%{User-Agent}>h" #定义生成访问日志的格式
access_log /usr/local/squid/var/logs/access.log squid #定义访问日志的路径
cache_log none #不生成缓存日志文件
cache_store_log none
2.4启动squid程序
启动squid程序：
/usr/local/squid/sbin/squid -Ds
更改配置文件后，重新加载：
/usr/local/squid/sbin/squid -k reconfigure
停止squid程序：
/usr/local/squid/sbin/squid -k shutdown
