Squid客户端SquidClient分析

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

Connection: close

mem                    Memory Utilization public
cbdata                 Callback Data Registry Contents public
events                 Event Queue     public
config                 Current Squid Configuration     hidden
ipcache                IP Cache Stats and Contents     public
fqdncache              FQDN Cache Stats and Contents   public
idns                   Internal DNS Statistics public
external_acl           External ACL stats public
http_headers           HTTP Header Statistics public
menu                   This Cachemanager Menu public
shutdown               Shut Down the Squid Process     hidden
offline_toggle         Toggle offline_mode setting     hidden
info                   General Runtime Information     public
filedescriptors        Process Filedescriptor Allocation       public
objects                All Cache Objects   public
vm_objects             In-Memory and In-Transit Objects        public
openfd_objects         Objects with Swapout files open public
pending_objects        Objects being retreived from the network        public
client_objects         Objects being sent to clients   public
io                     Server-side network read() size histograms      public
counters               Traffic and Resource Counters   public
peer_select            Peer Selection Algorithms       public
digest_stats           Cache Digest and ICP blob       public
5min                   5 Minute Average of Counters    public
60min                  60 Minute Average of Counters   public
utilization            Cache Utilization   public
histograms             Full Histogram Counts   public
active_requests        Client-side Active Requests     public
store_digest           Store Digest    public
storedir               Store Directory Stats   public
store_check_cachable_stats     storeCheckCachable() Stats      public
store_io               Store IO Interface Stats        public
pconn                  Persistent Connection Utilization Histograms    public
refresh                Refresh Algorithm Statistics    public
forward                Request Forwarding Statistics   public
client_list            Cache Client List   public
asndb                  AS Number Database public
server_list            Peer Cache Statistics   public
non_peers              List of Unknown sites sending ICP messages      public