基本的使用方法

*取得squid运行状态信息: squidclient -p 80 mgr:info
*取得squid内存使用情况: squidclient -p 80 mgr:mem
*取得squid已经缓存的列表: squidclient -p 80 mgr:objects. use it carefully,it may crash
*取得squid的磁盘使用情况: squidclient -p 80 mgr:diskd
*强制更新某个url:squidclient -p 80 -m PURGE http://www.php-oa.com/static.php
*更多的请查看:squidclient -h 或者 squidclient -p 80 mgr:

* 如何得知 squid 执行中的状态?

最简单的方式便是透过浏览器来观察。squid 本身提供一只 cgi 程式,档名为cachemgr.cgi,squid 安装完后将它复制到 Apache 下的 cgi-bin 这个目录下即可使用。

要察看Cache Manager提供的资讯时,请在浏览器的位址列中键入

http://伺服器的名称或IP位址/cgi-bin/cachemgr.cgi

当然,我更加喜欢使用下面的方法

squidclient -t 1 -h localhost -p 80 mgr:inf 这样也行

下面是一些基本内容

Squid Object Cache: Version 2.6 //Squid的版本

HTTP/1.0 200 OK
Date: Tue, 11 Mar 2008 16:08:14 GMT
Content-Type: text/plain
Expires: Tue, 11 Mar 2008 16:08:14 GMT
Last-Modified: Tue, 11 Mar 2008 16:08:14 GMT
Connection: close

Squid Object Cache: Version 2.6.STABLE6
Start Time:     Tue, 11 Mar 2008 10:21:47 GMT
Current Time:   Tue, 11 Mar 2008 16:08:14 GMT
Connection information for squid:
        Number of clients accessing cache:      2023            使用proxy的电脑数量
        Number of HTTP requests received:       81787        客户端http要求数量
        Number of ICP messages received:        0        接受到的icp query数量
        Number of ICP messages sent:    0            发出icp query数量
        Number of queued ICP replies:   0
        Request failure ratio:   0.00
        Average HTTP requests per minute since start:   236.1    每分钟http request的数量
        Average ICP messages per minute since start:    0.0
        Select loop called: 24789642 times, 0.839 ms avg
Cache information for squid:
        Request Hit Ratios:     5min: 99.6%, 60min: 98.7%    Cache Request命中率
        Byte Hit Ratios:        5min: 100.0%, 60min: 100.0%    Cache Byte命中率
        Request Memory Hit Ratios:      5min: 1.6%, 60min: 1.2%
        Request Disk Hit Ratios:        5min: 82.0%, 60min: 90.5%
        Storage Swap size:      7723212 KB            存放cache的磁碟使用量
        Storage Mem size:       7992 KB                存放cache的记忆体使用量
        Mean Object Size:       264.01 KB           
        Requests given to unlinkd:      279
Median Service Times (seconds) 5 min    60 min:
        HTTP Requests (All):   2.94900 3.46762
        Cache Misses:          0.03427 0.03427
        Cache Hits:            5.06039 4.79440
        Near Hits:             0.30459 0.35832
        Not-Modified Replies: 0.00179 0.00179
        DNS Lookups:           0.00000 0.00000
        ICP Queries:           0.00000 0.00000
Resource usage for squid:
        UP Time:        20787.011 seconds
        CPU Time:       128.799 seconds
        CPU Usage:      0.62%
        CPU Usage, 5 minute avg:        0.44%
        CPU Usage, 60 minute avg:       0.51%
        Process Data Segment Size via sbrk(): 34292 KB
        Maximum Resident Size: 0 KB
        Page faults with physical i/o: 0
Memory usage for squid via mallinfo():
        Total space in arena:   34424 KB
        Ordinary blocks:        27031 KB   8599 blks
        Small blocks:               0 KB      0 blks
        Holding blocks:          6152 KB      2 blks
        Free Small blocks:          0 KB
        Free Ordinary blocks:    7392 KB
        Total in use:           33183 KB 82%
        Total free:              7392 KB 18%
        Total size:             40576 KB
Memory accounted for:                记忆体使用状态
        Total accounted:        21777 KB
        memPoolAlloc calls: 15446992
        memPoolFree calls: 15337015
File descriptor usage for squid:
        Maximum number of file descriptors:   16384        系统最大file descriptor数
        Largest file desc currently in use:   1165        目前使用file descriptor最大值
        Number of file desc currently in use: 571        目前正在使用的file descriptor数
        Files queued for open:                   0
        Available number of file descriptors: 15813
        Reserved number of file descriptors:   100
        Store Disk files open:                 266
        IO loop method:                     epoll
Internal Data Structures:
         29315 StoreEntries            Cache中存放的快取档案数量
           190 StoreEntries with MemObjects    记忆体斗的快取档案数量
           176 Hot Object Cache Items        磁碟机中存放的快取档案数量
         29253 on-disk objects

Proxy 回应的速度很慢时,可能是那里出问题?如何判定问题发生在那里?

网路回应慢有可能是目的网站的问题,也有可能是带宽不足的问题带宽需求是永远根不上使用者的脚步,故在网路出现变慢的问题时,请先以 ping 或 traceroute 指令测试网路的连线状态,如果封包回应很慢或封包遗失率很高,应该是属网路本身的问题,如果测试的结果良好,再继续看是否是 Proxy 出了问题。当然ping也不一定能说明问题