测试环境： 操作系统 :centos5.0 web 服务器 :apache2 + tomcat 5.5 jdk : j2se 1.5.5 1. 下载 squid-3.0.stable9.tar.gz （测试时最新的版本）。 http://www.squid-cache.org/versions/v3/3.0/squid-3.0.stable9.tar.gz 2. 添加用户及组 # useradd squid -m
测试环境：
操作系统:centos5.0
web服务器:apache2 + tomcat 5.5
jdk : j2se 1.5.5
1.下载squid-3.0.stable9.tar.gz （测试时最新的版本）。
http://www.squid-cache.org/versions/v3/3.0/squid-3.0.stable9.tar.gz
2. 添加用户及组
# useradd squid -m -c squid user -d /dev/null-s /sbin/nologin
3. 解压并编译安装
tar squid-3.0.stable9.tar.gz
cd squid-3.0.stable9
./configure--prefix=/data/squid3 --disable-carp --with-aufs-threads=32 --with-pthreads--enable-storeio='ufs,aufs, null' --enable-disk-io='aio,blocking'--enable-removal-policies='heap,lru' --disable-wccp --enable-kill-parent-hack --disable-snmp --disable-poll--disable-select --enable-auth=basic --with-aio --disable-ident-lookup --with-filedescriptors=65536
编译参数不做详细介绍请查相关文档
make
makeinstall
安装完毕。
4. 配置
可能需要创建一些文件这些都是配置文件中需要调用的（这个要注意文件的属主和权限）
1) [root@www~]#cd /data/squid3/var/logs/
2) [root@www~]#touch cache.log
3) [root@www~]#chmod 755 cache.log
4) [root@www~]#chown squid:squid cache.log
5) [root@www~]#touch page_zs_access_log
6) [root@www~]#chmod 755 page_zs_access_log
7) [root@www~]#chown squid:squid page_zs_access_log
8) [root@www~]#cd /data/squid3/etc/
9) 配置squid配置文件 squid.conf
[root@www~]# vi squid.conf (192.168.3.11为服务器的ip地址)
visible_hostnamewww.test.com
http_port80 vhost vport
cache_mem512 mb
maximum_object_size_in_memory2048 kb
memory_replacement_policylru
cache_dirufs /tmp 512 16 256
max_open_disk_fds0
minimum_object_size0 kb
maximum_object_size32768 kb
logformatcombined %>a %ui %un [%tl] %rm %ru http/%rv %hs %h %{user-agent}>h %ss:%sh
access_log/data/squid3/var/logs/page_zs_access_log combined
pid_filename/data/squid3/var/logs/squid.pid
cache_store_lognone
cache_peer192.168.3.11 parent 81 0 no-query no-digest originserver name=www
cache_peer_domainwww www.test.com
cache_peer_accesswww allow all
http_accessallow all
aclquery urlpath_regex cgi-bin .php .cgi .avi .wmv .rm .ram .mpg .mpeg .zip .exe
cachedeny query
cache_effective_usersquid
cache_effective_groupsquid
10)[root@www ~]#/data/squid3/sbin/squid -k parse
可以根据这个测试命令用来验证squid.conf的语法和配置（下面是ok的如果不ok会有相应的提示根据提示来修改配置文件）
2008/10/1421:14:56| processing configuration file: /data/squid3/etc/squid.conf (depth 0)
11)[root@www ~]#/data/squid3/sbin/squid -z
用来创建缓存目录
12)vi一个squid.sh的启动脚本如下：赋予可执行权限
[root@www~]#vi squid.sh
#!/bin/sh
#
ulimit-hsn 15000
#this script starts and stops squid
echo15000 > /proc/sys/fs/file-max
case$1 in
start)
/data/squid3/sbin/squid -s
echo -n ' squid'
;;
stop)
/data/squid3/sbin/squid -k shutdown
;;
esac
#chmod+x squid.sh
5. 启动squid
[root@www~]#./squid.sh start就可以启动squid了
查看有没有启动可以
[root@www~]#ps fax|grep squid
13750 pts/3 s+ 0:00 \_ grepsquid
30474? ss 0:00 /data/squid3/sbin/squid -s
30476? s 0:01 \_ (squid) -s
通过命令lsof -i:80查看谁占用了80端口
查看squid的访问日志。
[root@www ~]# tail –f /data/squid3/var/logs/page_zs_access_log
查看命中率及其他相关信息
[root@www ~]# /data/squid3/bin/squidclient -p 80 -hlocalhost mgr:info
http/1.0 200 ok
server: squid/3.0.stable9
mime-version: 1.0
date: tue, 14 oct 2008 13:22:40 gmt
content-type: text/plain
expires: tue, 14 oct 2008 13:22:40 gmt
last-modified: tue, 14 oct 2008 13:22:40 gmt
x-cache: miss from www.6558855.com
via: 1.0 www.6558855.com (squid/3.0.stable9)
connection: close
squid object cache: version 3.0.stable9
start time: tue, 14 oct 2008 11:25:50 gmt
current time: tue, 14 oct 2008 13:22:40 gmt
connection information for squid:
number ofclients accessing cache: 2
number ofhttp requests received: 772
number oficp messages received: 0
number oficp messages sent: 0
number ofqueued icp replies: 0
number ofhtcp messages received: 0
number ofhtcp messages sent: 0
requestfailure ratio: 0.00
average http requests per minute sincestart: 6.6
average icpmessages per minute since start: 0.0
select loopcalled: 7081542 times, 0.990 ms avg
cache information for squid:
hits as %of all requests: 5min: 0.0%, 60min:89.7%
hits as %of bytes sent: 5min: -0.0%, 60min:-0.0%
memory hitsas % of hit requests: 5min: 0.0%,60min: 0.0%
disk hitsas % of hit requests: 5min: 0.0%, 60min: 0.0%
storageswap size: 104 kb
storage swap capacity: 0.0% used, 100.0% free
storage memsize: 228 kb
storage memcapacity: 0.0% used, 100.0% free
mean objectsize: 10.40 kb
requestsgiven to unlinkd: 68
median service times (seconds) 5 min 60 min:
httprequests (all): 0.00000 0.00000
cachemisses: 0.00000 0.00000
cachehits: 0.00000 0.00000
nearhits: 0.00000 0.00000
not-modified replies: 0.00000 0.00000
dnslookups: 0.00000 0.00000
icpqueries: 0.00000 0.00000
resource usage for squid:
uptime: 7009.125 seconds
cputime: 0.948 seconds
cpuusage: 0.01%
cpu usage,5 minute avg: 0.00%
cpu usage,60 minute avg: 0.01%
processdata segment size via sbrk(): 2968 kb
maximumresident size: 0 kb
page faultswith physical i/o: 2
memory usage for squid via mallinfo():
total spacein arena: 3240 kb
ordinaryblocks: 3194 kb 17 blks
smallblocks: 0 kb 0 blks
holdingblocks: 11472 kb 17 blks
free smallblocks: 0 kb
freeordinary blocks: 45 kb
total inuse: 14666 kb 100%
totalfree: 45 kb 0%
totalsize: 14712 kb
memory accounted for:
totalaccounted: 3001 kb 20%
mempoolaccounted: 3001 kb 20%
mempoolunaccounted: 11710 kb 80%
mempoolalloc calls: 147106
mempoolfreecalls: 145713
file descriptor usage for squid:
maximumnumber of file descriptors: 15000
largestfile desc currently in use: 14
number offile desc currently in use: 8
filesqueued for open: 0
availablenumber of file descriptors: 14992
reservednumber of file descriptors: 100
store diskfiles open: 0
internal data structures:
45storeentries
41storeentries with memobjects
40 hotobject cache items
10on-disk objects
6. 关于动态页面的缓存。
如jsp页面。
利用header为jsp服务器减压
在参与缓存的jsp中加入如下程序，进行“last-modified”和“expires”的设置；
longfile_lmodified = new file(/tmp/catchmodified.lastmodified();
response.setbuffersize(16);
response.setdateheader(last-modified,file_lmodified);
response.setdateheader(expires,system.currenttimemillis() / 1000 * 1000 + 300000);
response.flushbuffer();
%>
7. 添加自动更新记时方式
[root@www ~]#vi refreshcatch.sh
#/bin/sh
/bin/echo>/tmp/catchmodified
chmod+x refreshcatch.sh
然后在crontab里写一句
*/5 * * * * /data/squid3/refreshcatch.sh