怎么样基于反向代理的Web缓存加速现服务器方案附squid性能测试？

基于反向代理的Web缓存加速现代理服务器方案

基于Apache mod_proxy的反向代理缓存加速实现

Apache包含了mod_proxy模块，可以用来实现代理服务器，针对后台服务器的反向加速

安装apache 1.3.x 编译时：

--enable-shared=max --enable-module=most

注：Apache 2.x中mod_proxy已经被分离成mod_proxy和mod_cache：同时mod_cache有基于文件和基于内存的不同实现

创建/var/www/proxy，设置apache服务所用户可写

mod_proxy配置样例：反相代理缓存＋缓存

架设前台的www.example.com反向代理后台的www.backend.com的8080端口服务。

修改：httpd.conf

<VirtualHost *>

ServerName www.example.com

ServerAdmin admin@example.com

# reverse proxy setting

ProxyPass / http://www.backend.com:8080/

ProxyPassReverse / http://www.backend.com:8080/

# cache dir root

CacheRoot "/var/www/proxy"

# max cache storage

CacheSize 50000000

# hour: every 4 hour

CacheGcInterval 4

# max page expire time: hour

CacheMaxExpire 240

# Expire time = (now - last_modified) * CacheLastModifiedFactor

CacheLastModifiedFactor 0.1

# defalt expire tag: hour

CacheDefaultExpire 1

# force complete after precent of content retrived: 60-90%

CacheForceCompletion 80

CustomLog /usr/local/apache/logs/dev_access_log combined

</VirtualHost>

基于Squid的反向代理加速实现

Squid是一个更专用的代理服务器，性能和效率会比Apache的mod_proxy高很多。

如果需要combined格式日志补丁：

http://www.squid-cache.org/mail-archive/squid-dev/200301/0164.html

squid的编译：

./configure --enable-useragent-log--enable-referer-log --enable-default-err-language=Simplify_Chinese --enable-err-languages="Simplify_Chinese English" --disable-internal-dns

make

#make install

#cd /usr/local/squid

make dir cache

chown squid.squid *

vi /usr/local/squid/etc/squid.conf

在/etc/hosts中：加入内部的DNS解析，比如：

192.168.0.4 [url]www.chedong.com[/url]

192.168.0.4 news.chedong.com

192.168.0.3 bbs.chedong.com

---------------------cut here----------------------------------

# visible name

visible_hostname cache.example.com

# cache config: space use 1G and memory use 256M

cache_dir ufs /usr/local/squid/cache 1024 16 256

cache_mem 256 MB

cache_effective_user squid

cache_effective_group squid

http_port 80

httpd_accel_host virtual

httpd_accel_single_host off

httpd_accel_port 80

httpd_accel_uses_host_header on

httpd_accel_with_proxy on

# accelerater my domain only

acl acceleratedHostA dstdomain .example1.com

acl acceleratedHostB dstdomain .example2.com

acl acceleratedHostC dstdomain .example3.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 acceleratedProtocol acceleratedPort acceleratedHostC

# logging

emulate_httpd_log on

cache_store_log none

# manager

acl manager proto cache_object

http_access allow manager all

cachemgr_passwd pass all

----------------------cut here---------------------------------

创建缓存目录：

/usr/local/squid/sbin/squid -z

启动squid

/usr/local/squid/sbin/squid

停止squid：

/usr/local/squid/sbin/squid -k shutdown

启用新配置：

/usr/local/squid/sbin/squid -k reconfig

通过crontab每天0点截断/轮循日志：

0 0 * * * (/usr/local/squid/sbin/squid -k rotate)

附：SQUID性能测试试验

phpMan.php是一个基于php的man page server，每个man

page需要调用后台的man命令和很多页面格式化工具，系统负载比较高，提供了Cache

Friendly的URL，以下是针对同样的页面的性能测试资料：

测试环境：Redhat 8 on Cyrix 266 / 192M Mem

测试程序：使用apache的ab(apache benchmark)：

测试条件：请求50次，并发50个连接

测试项目：直接通过apache 1.3 (80端口) vs squid 2.5(8000端口：加速80端口)

测试1：无CACHE的80端口动态输出：

ab -n 100 -c 10 [url]http://www.chedong.com:81/phpMan.php/man/kill/1[/url]

This is ApacheBench, Version 1.3d <$Revision: 1.2 $> apache-1.3

Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd,

[url]http://www.zeustech.net/[/url]

Copyright (c) 1998-2001 The Apache Group, [url]http://www.apache.org/[/url]

Benchmarking localhost (be patient).....done

Server Software:

Apache/1.3.23

Server Hostname:localhost

Server

Port:

80

Document Path:

/phpMan.php/man/kill/1

Document Length:4655 bytes

Concurrency Level:5

Time taken for tests: 63.164 seconds

Complete requests:50

Failed requests:0

Broken pipe errors: 0

Total transferred:245900 bytes

HTML transferred: 232750 bytes

Requests per second:0.79 [#/sec] (mean)

Time per request: 6316.40 [ms]

(mean)

Time per request: 1263.28 [ms]

(mean, across all concurrent requests)

Transfer rate:

3.89 [Kbytes/sec] received

Connnection Times (ms)

minmean[+/-sd] median max

Connect:0

29106.10 553

Processing:29426016

1845.4 6227 10796

Waiting:

29415999 1850.7 6226 10795

Total:

29426045 1825.9 6227 10796

Percentage of the requests served within a certain time (ms)

50% 6227

66% 7069

75% 7190

80% 7474

90% 8195

95% 8898

98% 9721

99%10796

100%10796 (last request)

测试2：SQUID缓存输出

/home/apache/bin/ab -n50 -c5

"http://localhost:8000/phpMan.php/man/kill/1"

This is ApacheBench, Version 1.3d <$Revision: 1.2 $> apache-1.3

Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd,

[url]http://www.zeustech.net/[/url]

Copyright (c) 1998-2001 The Apache Group, [url]http://www.apache.org/[/url]

Benchmarking localhost (be patient).....done

Server Software:

Apache/1.3.23

Server Hostname:localhost

Server

Port:

8000

Document Path:

/phpMan.php/man/kill/1

Document Length:4655 bytes

Concurrency Level:5

Time taken for tests: 4.265 seconds

Complete requests:50

Failed requests:0

Broken pipe errors: 0

Total transferred:248043 bytes

HTML transferred: 232750 bytes

Requests per second:11.72 [#/sec] (mean)

Time per request: 426.50 [ms] (mean)

Time per request: 85.30 [ms] (mean,

across all concurrent requests)

Transfer rate:

58.16 [Kbytes/sec] received

Connnection Times (ms)

minmean[+/-sd] median max

Connect:

0 1

9.5068

Processing:

783537.4

73808

Waiting:

581529.1

63748

Total:

784547.0

73876

Percentage of the requests served within a certain time (ms)

50%7

66%7

75%7

80%7

90%7

95%7

98%8

99% 3876

100% 3876 (last request)

结论：No Cache / Cache = 6045 / 84 = 70

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