130 lines
7.7 KiB
Markdown
130 lines
7.7 KiB
Markdown
---
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title: nginxのアクセス数を集計するプラグイン
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author: kazu634
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date: 2012-03-27
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wordtwit_post_info:
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- 'O:8:"stdClass":13:{s:6:"manual";b:0;s:11:"tweet_times";s:1:"1";s:5:"delay";s:1:"0";s:7:"enabled";s:1:"1";s:10:"separation";i:60;s:7:"version";s:3:"3.7";s:14:"tweet_template";b:0;s:6:"status";i:2;s:6:"result";a:0:{}s:13:"tweet_counter";i:2;s:13:"tweet_log_ids";a:1:{i:0;i:5453;}s:9:"hash_tags";a:0:{}s:8:"accounts";a:1:{i:0;s:7:"kazu634";}}'
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categories:
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- つれづれ
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---
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<div class="section">
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<p>
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muninでnginxのアクセス数を集計するプラグインを作成してみました。
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</p>
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<h4>
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やりたいこと
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</h4>
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<p>
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nginxのログファイルからお手軽にアクセス数を集計したい。
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</p>
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<h4>
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muninプラグインの仕様
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</h4>
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<ul>
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<li>
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configという引数を与えられると、muninのconfigを標準出力に出力する
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</li>
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<li>
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引数なしの場合には、「属性名 数値」を出力する
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</li>
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<li>
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5分毎に呼び出される
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</li>
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</ul>
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<p>
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詳細は<a href="http://munin-monitoring.org/wiki/HowToWritePlugins" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://munin-monitoring.org/wiki/HowToWritePlugins', ' HowToWritePlugins ? Munin ');" target="_blank"> HowToWritePlugins ? Munin </a>を参照のこと。
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</p>
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<h4>
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nginxのログの仕様
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</h4>
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<ul>
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<li>
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1アクセスが1行のログとして書き込まれる
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</li>
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<li>
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(私の場合は)24hごとにログがローテーションする
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</li>
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</ul>
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<h4>
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デザイン
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</h4>
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<ul>
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<li>
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1アクセスが1行のログとして書き込まれることから、wcコマンドで行数をカウントすればよさそう。この時点でシェルスクリプトで作成することに決定
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</li>
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<li>
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直前にスクリプトを実行した際の行数と、現在の行数をカウントして、その差がアクセス数
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</li>
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<li>
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ローテーションした場合には「現在の行数」< 「直前にスクリプトを実行した際の行数」の時。この時はアクセス数は0とする。次回の起動時にアクセス数としてカウントする。
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</li>
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</ul>
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<h4>
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作成したスクリプト
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</h4>
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<pre class="syntax-highlight">
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<span class="synComment">#!/bin/bash</span>
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<span class="synComment"># -----------</span>
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<span class="synComment"># varibales</span>
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<span class="synComment"># -----------</span>
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<span class="synIdentifier">LOGFILE</span>=<span class="synStatement">"</span><span class="synConstant">/var/log/nginx/front_proxy.access.log</span><span class="synStatement">"</span>
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<span class="synIdentifier">LASTDATA</span>=<span class="synStatement">"</span><span class="synConstant">/tmp/.munin-nginx</span><span class="synStatement">"</span>
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<span class="synComment"># -----------------------</span>
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<span class="synComment"># Handling the arguments</span>
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<span class="synComment"># -----------------------</span>
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<span class="synStatement">case</span> <span class="synPreProc">$1</span> <span class="synStatement">in</span>
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config<span class="synStatement">)</span>
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cat <span class="synStatement"><<'EOM'</span>
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<span class="synConstant">graph_args -l 0</span>
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<span class="synConstant">graph_scale no</span>
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<span class="synConstant">graph_category nginx</span>
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<span class="synConstant">graph_title Nginx Access</span>
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<span class="synConstant">graph_vlabel access</span>
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<span class="synConstant">access.label access</span>
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<span class="synStatement">EOM</span>
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<span class="synStatement">exit</span> <span class="synConstant"></span><span class="synStatement">;;</span>
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<span class="synStatement">esac</span>
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<span class="synComment"># -----------------------</span>
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<span class="synComment"># Collecting data</span>
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<span class="synComment"># -----------------------</span>
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<span class="synIdentifier">CURRENT_LINENUM</span>=<span class="synSpecial">`wc -l </span><span class="synPreProc">${LOGFILE}</span><span class="synSpecial"> </span><span class="synStatement">|</span><span class="synSpecial"> perl -pe </span><span class="synStatement">"</span><span class="synConstant">s/^ +//</span><span class="synStatement">"</span><span class="synSpecial"> </span><span class="synStatement">|</span><span class="synSpecial"> cut -f </span><span class="synConstant">1</span><span class="synSpecial"> -d </span><span class="synStatement">"</span><span class="synConstant"> </span><span class="synStatement">"</span><span class="synSpecial">`</span>
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<span class="synComment"># checks if the last recorded data exists or not:</span>
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<span class="synStatement">if</span> <span class="synStatement">[</span> <span class="synStatement">-e</span> <span class="synPreProc">${LASTDATA}</span> <span class="synStatement">];</span> <span class="synStatement">then</span>
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<span class="synComment"> # Get the last line number</span>
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<span class="synIdentifier">LASTLINE</span>=<span class="synSpecial">`cat </span><span class="synPreProc">${LASTDATA}</span><span class="synSpecial">`</span>
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<span class="synStatement">expr</span> <span class="synPreProc">${CURRENT_LINENUM}</span> \<span class="synStatement"><</span> <span class="synPreProc">${LASTLINE}</span> <span class="synStatement">></span> /dev/null
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<span class="synIdentifier">RESULT</span>=<span class="synPreProc">$?</span>
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<span class="synComment"> # when the target log file is rotated,</span>
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<span class="synStatement">if</span> <span class="synStatement">[</span> <span class="synPreProc">$RESULT</span> <span class="synStatement">-eq</span> <span class="synConstant"></span> <span class="synStatement">];</span> <span class="synStatement">then</span>
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<span class="synComment"> # it returns 0</span>
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<span class="synStatement">echo</span><span class="synConstant"> </span><span class="synStatement">"</span><span class="synConstant">access.value 0</span><span class="synStatement">"</span>
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<span class="synComment"> # and sets 0 to the $LASTDATA</span>
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<span class="synStatement">echo</span><span class="synConstant"> 0 </span><span class="synStatement">></span> <span class="synPreProc">${LASTDATA}</span>
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<span class="synComment"> # not rotated</span>
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<span class="synStatement">else</span>
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<span class="synStatement">echo</span><span class="synConstant"> -n </span><span class="synStatement">"</span><span class="synConstant">access.value </span><span class="synStatement">"</span>
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<span class="synStatement">echo</span><span class="synConstant"> </span><span class="synSpecial">`</span><span class="synStatement">expr</span><span class="synSpecial"> </span><span class="synPreProc">${CURRENT_LINENUM}</span><span class="synSpecial"> - </span><span class="synPreProc">${LASTLINE}</span><span class="synSpecial">`</span>
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<span class="synStatement">echo</span><span class="synConstant"> </span><span class="synPreProc">${CURRENT_LINENUM}</span><span class="synConstant"> </span><span class="synStatement">></span> <span class="synPreProc">${LASTDATA}</span>
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<span class="synStatement">fi</span>
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<span class="synStatement">else</span>
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<span class="synComment"> # if the log file does not exist, it returns 0</span>
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<span class="synStatement">echo</span><span class="synConstant"> </span><span class="synStatement">"</span><span class="synConstant">access.value 0</span><span class="synStatement">"</span>
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<span class="synComment"> # and sets the current line number to the $LASTDATA</span>
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<span class="synStatement">echo</span><span class="synConstant"> </span><span class="synPreProc">${CURRENT_LINENUM}</span><span class="synConstant"> </span><span class="synStatement">></span> <span class="synPreProc">${LASTDATA}</span>
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<span class="synStatement">fi</span>
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<span class="synStatement">exit</span> <span class="synConstant"></span>
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</pre>
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</div>
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