squid3加速web服务器

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:centos 5.0

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

make install

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_hostname www.test.com

http_port 80 vhost vport

cache_mem 512 MB

maximum_object_size_in_memory 2048 KB

memory_replacement_policy lru

cache_dir ufs /tmp 512 16 256

max_open_disk_fds 0

minimum_object_size 0 KB

maximum_object_size 32768 KB

logformat combined %>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_log none

cache_peer 192.168.3.11 parent 81 0 no-query no-digest originserver name=www

cache_peer_domain www www.test.com

cache_peer_access www allow all

http_access allow all

acl QUERY urlpath_regex cgi-bin .php .cgi .avi .wmv .rm .ram .mpg .mpeg .zip .exe

cache deny QUERY

cache_effective_user squid

cache_effective_group squid

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）

2008/10/14 21:14:56| 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

echo 15000 > /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 \_ grep squid

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 -h localhost 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 of clients accessing cache: 2

Number of HTTP requests received: 772

Number of ICP messages received: 0

Number of ICP messages sent: 0

Number of queued ICP replies: 0

Number of HTCP messages received: 0

Number of HTCP messages sent: 0

Request failure ratio: 0.00

Average HTTP requests per minute since start: 6.6

Average ICP messages per minute since start: 0.0

Select loop called: 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 hits as % of hit requests: 5min: 0.0%, 60min: 0.0%

Disk hits as % of hit requests: 5min: 0.0%, 60min: 0.0%

Storage Swap size: 104 KB

Storage Swap capacity: 0.0% used, 100.0% free

Storage Mem size: 228 KB

Storage Mem capacity: 0.0% used, 100.0% free

Mean Object Size: 10.40 KB

Requests given to unlinkd: 68

Median Service Times (seconds) 5 min 60 min:

HTTP Requests (All): 0.00000 0.00000

Cache Misses: 0.00000 0.00000

Cache Hits: 0.00000 0.00000

Near Hits: 0.00000 0.00000

Not-Modified Replies: 0.00000 0.00000

DNS Lookups: 0.00000 0.00000

ICP Queries: 0.00000 0.00000

Resource usage for squid:

UP Time: 7009.125 seconds

CPU Time: 0.948 seconds

CPU Usage: 0.01%

CPU Usage, 5 minute avg: 0.00%

CPU Usage, 60 minute avg: 0.01%

Process Data Segment Size via sbrk(): 2968 KB

Maximum Resident Size: 0 KB

Page faults with physical i/o: 2

Memory usage for squid via mallinfo():

Total space in arena: 3240 KB

Ordinary blocks: 3194 KB 17 blks

Small blocks: 0 KB 0 blks

Holding blocks: 11472 KB 17 blks

Free Small blocks: 0 KB

Free Ordinary blocks: 45 KB

Total in use: 14666 KB 100%

Total free: 45 KB 0%

Total size: 14712 KB

Memory accounted for:

Total accounted: 3001 KB 20%

memPool accounted: 3001 KB 20%

memPool unaccounted: 11710 KB 80%

memPoolAlloc calls: 147106

memPoolFree calls: 145713

File descriptor usage for squid:

Maximum number of file descriptors: 15000

Largest file desc currently in use: 14

Number of file desc currently in use: 8

Files queued for open: 0

Available number of file descriptors: 14992

Reserved number of file descriptors: 100

Store Disk files open: 0

Internal Data Structures:

45 StoreEntries

41 StoreEntries with MemObjects

40 Hot Object Cache Items

10 on-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；

<%@ page import="java.io.*"%>

<%

long file_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