张宴的博客

清除指定squid缓存文件的脚本[原创]

Sun, 22 Jul 2007 15:41:21 +0000

　　[文章作者：张宴本文版本：v1.0 最后修改：2007.08.02 转载请注明出处：http://blog.zyan.cc]

　　Squid web缓存加速软件目前已经是新浪、搜狐、网易等各大网站广泛应用。Squid会在设置的缓存目录下建立多个目录，每一个目录下又建立多个目录，然后才在最里层的目录中存放缓存文件（object）。squid会根据用户请求网页的URL进行哈希，生成缓存文件，存放在某一个目录中。squid启动之后，将在内存中建立一个哈希表，记录硬盘中缓存文件配置的情形。

　　对于类似http://you.video.sina.com.cn/index.html之类的网页，squid只会生成一个缓存文件。可以用squid附带的squidclient工具清除：

引用

squidclient -m PURGE -p 80 "http://you.video.sina.com.cn/index.html"

　　而对于带有参数的网页，例如新浪播客的Flash播放器http://vhead.blog.sina.com.cn/player/outer_player.swf?auto=0&vid=4469852&uid=1278987704，因“?”后面的参数不同，导致URL也不同，squid会生成多个缓存文件，哈希分散存放在不同的目录。如果修改了这个outer_player.swf文件，要更新squid缓存就要去清除不同目录下及内存中的很多个缓存文件，十分麻烦，于是我编写了一个Linux下的shell脚本，去完成这件麻烦的事：

　　脚本文件名：clear_squid_cache.sh（8月2日修正了UC网友“城市中的寂寞”反馈的BUG）

引用

#!/bin/sh
squidcache_path="/data1/squid/var/cache"
squidclient_path="/usr/local/squid/bin/squidclient"
grep -a -r $1 $squidcache_path/* | strings | grep "http:" | awk -F'http:' '{print "http:"$2;}' > cache_list.txt
for url in `cat cache_list.txt`; do
$squidclient_path -m PURGE -p 80 $url
done

　　注意：请赋予clear_squid_cache.sh可执行权限（命令：chmod +x ./clear_squid_cache.sh）。请确保脚本所在目录可写。

　　设置：
　　squidcache_path= 表示squid缓存目录的路径
　　squidclient_path= 表示squidclient程序所在的路径，默认为squid安装目录下的bin/squidclient

　　用法：
　　1、清除所有Flash缓存（扩展名.swf）：
　　./clear_squid_cache.sh swf

　　2、清除URL中包含sina.com.cn的所有缓存：
　　./clear_squid_cache.sh sina.com.cn

　　3、清除文件名为zhangyan.jpg的所有缓存：
　　./clear_squid_cache.sh zhangyan.jpg

　　效率：
　　经测试，在DELL 2950上清除26000个缓存文件用时2分钟左右。平均每秒可清除缓存文件177个。
Tags - linux , squid , cache

[评论] 清除指定squid缓存文件的脚本[原创]

Mon, 04 Aug 2008 02:33:30 +0000

client: ERROR: Cannot connect to localhost:80: Connection refused

缓存清理脚本出现的错误信息不知道哪里出错了
帮忙看一下谢谢了

[评论] 清除指定squid缓存文件的脚本[原创]

Sat, 20 Dec 2008 06:24:04 +0000

client: ERROR: Cannot connect to localhost:80: Host unknown.

我也有同样的错误，不知是什么原由：
[root@mamiai01 etc]# . clear_squid_cache.sh .jpg
client: ERROR: Cannot connect to localhost:80: Host unknown.
client: ERROR: Cannot connect to localhost:80: Host unknown.
HTTP/1.1 301 Moved Permanently
Server: nginx/0.5.23
Date: Sat, 20 Dec 2008 06:22:33 GMT
Content-Type: text/html
Content-Length: 185
Connection: close
Location: http://bjdns3.cncmax.cn:8080?HOST=mamiai.cn&R=/mamiai/baby/images/index_81_13.jpg&

[评论] 清除指定squid缓存文件的脚本[原创]

Fri, 03 Apr 2009 07:53:22 +0000

运行squidclient -h ip PURGE http://ip:port/index.html
提示 403 forbidden

[评论] 清除指定squid缓存文件的脚本[原创]

Wed, 06 May 2009 09:03:21 +0000

ls的兄弟, 不是哪个人都能随便清除的.
看一下htcp_clr_access就知道了
默认是拒绝所有人
htcp_clr_access deny all

并且squid在编译时要加上--enable-htcp

[评论] 清除指定squid缓存文件的脚本[原创]

Wed, 20 Jan 2010 08:48:06 +0000

张老师我觉得你的grep那段结果还是会出来很多不相关的连接，我对你的grep优化了下好像有好转，你看下

grep -aR $1 $squidcache_path/* | strings | grep "^http:" |grep "$1$" > cache_list.txt

[评论] 清除指定squid缓存文件的脚本[原创]

Tue, 29 Jun 2010 08:03:56 +0000

看一下你/etc/hosts是否是正常的
client: ERROR: Cannot connect to localhost:80: Host unknown.

我也有同样的错误，不知是什么原由：
[root@mamiai01 etc]# . clear_squid_cache.sh .jpg
client: ERROR: Cannot connect to localhost:80: Host unknown.
client: ERROR: Cannot connect to localhost:80: Host unknown.
HTTP/1.1 301 Moved Permanently
Server: nginx/0.5.23
Date: Sat, 20 Dec 2008 06:22:33 GMT
Content-Type: text/html
Content-Length: 185
Connection: close
Location: http://bjdns3.cncmax.cn:8080?HOST=mamiai.cn&R=/mamiai/baby/images/index_81_13.jpg&

[评论] 清除指定squid缓存文件的脚本[原创]

Wed, 04 Aug 2010 02:51:18 +0000

[root@vps238 bin]# ./clear_squid_cache.sh uggs4sale.com
grep: /dev/kmem: Permission denied
不知道这是什么原因？

[评论] 清除指定squid缓存文件的脚本[原创]

Tue, 21 Dec 2010 07:33:29 +0000

client: ERROR: Cannot connect to localhost:80: Host unknown.
client: ERROR: Cannot connect to localhost:80: Host unknown.

HOSTS文件没有解析localhost 打/etc/hosts 添加 127.0.0.1 localhost

[评论] 清除指定squid缓存文件的脚本[原创]

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