基於Apache mod_proxy的反向代理緩存加速實現 Apache包含了mod_proxy模塊，可以用來實現代理服務器，針對後台服務器的反向加速 安裝apache 1.3.x 編譯時： --enable-shared=max --enable-module=most 注：Apache 2.x中mod_proxy已經被分離成mod_proxy和mod_cache：同時mod_cache有基於文件和基於內存的不同實現 創建/var/www/proxy，設置apache服務所用戶可寫 mod_proxy配置樣例：反相代理緩存＋緩存 架設前台的www.example.com反向代理後台的www.backend.com的8080端口服務。 修改：httpd.conf <VirtualHost *> ServerName www.example.com ServerAdmin
[email protected] # 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>
基於Squid的反向代理加速實現 Squid是一個更專用的代理服務器，性能和效率會比Apache的mod_proxy高很多。 如果需要combined格式日志補丁： http://www.squid-cache.org/mail-archive/squid-dev/200301/0164.Html squid的編譯： ./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：加入內部的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--------------------------------- 創建緩存目錄： /usr/local/squid/sbin/squid -z 啟動squid /usr/local/squid/sbin/squid 停止squid： /usr/local/squid/sbin/squid -k shutdown 啟用新配置： /usr/local/squid/sbin/squid -k reconfig 通過crontab每天0點截斷/輪循日志： 0 0 * * * (/usr/local/squid/sbin/squid -k rotate)
附：SQUID性能測試試驗 PHPMan.php是一個基於php的man page server，每個man page需要調用後台的man命令和很多頁面格式化工具，系統負載比較高，提供了Cache Friendly的URL，以下是針對同樣的頁面的性能測試資料： 測試環境：Redhat 8 on Cyrix 266 / 192M Mem 測試程序：使用apache的ab(apache benchmark)： 測試條件：請求50次，並發50個連接 測試項目：直接通過apache 1.3 (80端口) vs squid 2.5(8000端口：加速80端口) 測試1：無CACHE的80端口動態輸出： 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 $> apache-1.3 Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, [url]http://www.zeustech.net/[/url] Copyright (c) 1998-2001 The Apache Group, [url]http://www.apache.org/[/url] Benchmarking localhost (be patient).....done Server Software: Apache/1.3.23 Server Hostname: localhost Server Port: 80 Document Path: /phpMan.php/man/kill/1 Document Length: 4655 bytes Concurrency Level: 5 Time taken for tests: 63.164 seconds Complete requests: 50 Failed requests: 0 Broken pipe errors: 0 Total transferred: 245900 bytes HTML transferred: 232750 bytes Requests per second: 0.79 [#/sec] (mean) Time per request: 6316.40 [ms] (mean) Time per request: 1263.28 [ms] (mean, across all concurrent requests) Transfer rate: 3.89 [Kbytes/sec] received Connnection Times (ms) min mean[+/-sd] median max Connect: 0 29 106.1 0 553 Processing: 2942 6016 1845.4 6227 10796 Waiting: 2941 5999 1850.7 6226 10795 Total: 2942 6045 1825.9 6227 10796 Percentage of the requests served within a certain time (ms) 50% 6227 66% 7069 75% 7190 80% 7474 90% 8195 95% 8898 98% 9721 99% 10796 100% 10796 (last request) 測試2：SQUID緩存輸出 /home/apache/bin/ab -n50 -c5 "http://localhost:8000/phpMan.php/man/kill/1" This is ApacheBench, Version 1.3d <$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) min mean[+/-sd] median max Connect: 0 1 9.5 0 68 Processing: 7 83 537.4 7 3808 Waiting: 5 81 529.1 6 3748 Total: 7 84 547.0 7 3876 Perce
