Squidの稼働状態をコマンドで確認する

notoです。 Proxyサーバ、キャッシュサーバとして利用されている Squid を触る機会があったのでメモです。

確認できる項目を表示する

以下のコマンドで確認できる項目が一覧で表示されます。

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squidclient mgr:
 
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offline_toggle           Toggle offline_mode setting         hidden
shutdown                  Shut Down the Squid Process         hidden
reconfigure               Reconfigure Squid                   hidden
menu                      Cache Manager Menu                  public
pconn                     Persistent Connection Utilization Histograms    public
mem                       Memory Utilization                  public
squidaio_counts           Async IO Function Counters          public
diskd                     DISKD Stats                         public
config                    Current Squid Configuration         hidden
comm_epoll_incoming       comm_incoming() stats               public
ipcache                   IP Cache Stats and Contents         public
fqdncache                 FQDN Cache Stats and Contents       public
idns                      Internal DNS Statistics             public
redirector                URL Redirector Stats                public
external_acl              External ACL stats                  public
http_headers              HTTP Header Statistics              public
info                      General Runtime Information         public
service_times             Service Times (Percentiles)         public
filedescriptors           Process Filedescriptor Allocation   public
objects                   All Cache Objects                   public
vm_objects                In-Memory and In-Transit Objects    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
openfd_objects            Objects with Swapout files open     public
store_digest              Store Digest                        public
store_log_tags            Histogram of store.log tags         public
storedir                  Store Directory Stats               public
store_io                  Store IO Interface Stats            public
store_check_cachable_stats    storeCheckCachable() Stats          public
refresh                   Refresh Algorithm Statistics        public
delay                     Delay Pool Levels                   public
forward                   Request Forwarding Statistics       public
cbdata                    Callback Data Registry Contents     public
events                    Event Queue                         public
client_list               Cache Client List                   public
asndb                     AS Number Database                  public
carp                      CARP information                    public
userhash                  peer userhash information           public
sourcehash                peer sourcehash information         public
server_list               Peer Cache Statistics               public

キャッシュディレクトリの情報を確認する

以下のコマンドで、キャッシュが格納されているディレクトリ情報を確認することができます。

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squidclient mgr:storedir

キャッシュ容量や、現在 何％利用されているかを確認することができます。

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HTTP/1.0 200 OK
Server: squid/3.1.10
Mime-Version: 1.0
Date: Sun, 20 May 2012 06:47:35 GMT
Content-Type: text/plain
Expires: Sun, 20 May 2012 06:47:35 GMT
Last-Modified: Sun, 20 May 2012 06:47:35 GMT
X-Cache: MISS from image.cache.com
X-Cache-Lookup: MISS from image.cache.com:3128
Via: 1.0 image.cache.com (squid/3.1.10)
Connection: close

Store Directory Statistics:
Store Entries          : 35
Maximum Swap Size      : 102400 KB
Current Store Swap Size:     1344 KB
Current Capacity       : 1% used, 99% free

Store Directory #0 (ufs): /var/spool/squid
FS Block Size 4096 Bytes
First level subdirectories: 16
Second level subdirectories: 256
Maximum Size: 102400 KB
Current Size: 1344 KB
Percent Used: 1.31%
Filemap bits in use: 8 of 16384 (0%)
Filesystem Space in use: 1842560/18102140 KB (10%)
Filesystem Inodes in use: 61967/1150560 (5%)
Flags: SELECTED
Removal policy: lru
LRU reference age: 1.36 days

メモリ使用量を確認する

以下のコマンドで、メモリ使用量を確認することができます。

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squidclient mgr:mem
 
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・・・省略・・・
Cumulative allocated volume: 34.53 MB
Current overhead: 24962 bytes (11.150%)
Idle pool limit: 5.00 MB
Total Pools created: 97
Pools ever used:     78 (shown above)
Currently in use:    53
String Pool    Impact
   (%strings)  (%volume)
Short Strings          100     99
Medium Strings         0   1
Long Strings           0   0
Other Strings          0   0

Large buffers: 0 (0 KB)

検証時や、障害時に使えそうです。 Squidの設定方法がまだよく分かっていないので、勉強したらブログに記載したいと思います。

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