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 * http://munin-monitoring.org/

 * [http://wp.serpere.info/archives/2272 muninの集計負荷をtmpfsで低減する（集計時間の短縮も） | へびにっき]
 * [http://beeznest.wordpress.com/2011/06/13/howto-rename-munin-node-without-loosing-history/ HOWTO Rename Munin node without losing history « BeezNest Open-Source specialists]
 * [http://ref.layer8.sh/ja/entry/show/id/2667 munin設定チェックリストまとめ - Layer8 Reference]
 * [http://munin-monitoring.org/wiki/MuninTLSSetup MuninTLSSetup - Munin - Trac]
 > If your Munin installations resides in a hostile network environment, or if you just don't want anyone passing by with a network sniffer to know the CPU load of your Munin nodes, a quick solution is to enable Munin's built-in Transport Layer Security (TLS) support.
 * [http://masaru.org/diary/20101112.html Munin で温度を記録しよう。 - よこいまさる日記(2010-11-12)]
 * http://wiki.kartbuilding.net/index.php/Munin_Statistics
 * [http://d.hatena.ne.jp/over80/20080701/1214926377 muninのプラグインの追加/削除 - 玉虫色に染まれ！]
 * [http://techno-st.net/2009/12/10/munin-munin-node-configure.html munin で困ったときは munin-node-configure してみる - trial and error]
 * [https://bugs.launchpad.net/ubuntu/+source/munin/+bug/830564 Bug #830564 in munin (Ubuntu): “munin_stats plugin does not work”]
 > {{{#!diff
 > --- munin_stats
 > +++ munin_stats
 > @@ -52,10 +52,11 @@
 > 
 >  if ($ARGV[0] and $ARGV[0] eq "config") {
 >      print "graph_title Munin processing time\n",
 > -          "graph_info This graph shows the run time of the four different processes making up a munin-master run.  Munin-master is run from cron every 5 minutes and we want each of the programmes in munin-master to complete before the next instance starts.  Especially munin-update and munin-graph are time consuming and their run time bears watching. If munin-update uses too long time to run please see the munin-update graph to determine which host is slowing it down.  If munin-graph is running too slow you need to get clever (email the munin-users mailing list) unless you can buy a faster computer with better disks to run munin on.",
 > +          "graph_info This graph shows the run time of the four different processes making up a munin-master run.  Munin-master is run from cron every 5 minutes and we want each of the programmes in munin-master to complete before the next instance starts.  Especially munin-update and munin-graph are time consuming and their run time bears watching. If munin-update uses too long time to run please see the munin-update graph to determine which host is slowing it down.  If munin-graph is running too slow you need to get clever (email the munin-users mailing list) unless you can buy a faster computer with better disks to run munin on.\n",
 >            "graph_args --base 1000 -l 0\n",
 >            "graph_scale yes\n",
 >            "graph_vlabel seconds\n",
 > }}}
 * [http://serverfault.com/questions/224359/adjusting-munins-accept-timeout Adjusting Munin's accept timeout - Server Fault]
 >> I have a Munin master that's contacting 5 nodes at the moment and I'm seeing one to two warnings like this in the munin-update.log.
 >> {{{
 >> [WARNING] Call to accept timed out.  Remaining workers: xyz;abc
 >> }}}
 > in your plugin configuration file add
 > 
 > timeout 120
 > 
 > or on a per plugin basis in plugin-conf.d
 > 
 > [plugin_name] timeout 120
 * [http://forums.cpanel.net/f42/fixing-munin-68412.html Fixing Munin]
 > Here is how you fix Munin 1.24 for CPanel to get the mysql graphs, the HDD temp graphs, and the Mailman graphs:
 > {{{
 > (snip)
 > 
 > [mailman]
 > user mailman
 > }}}
  * Debianでは「user list」
  * MLの数が多いと数え上げがタイムアウトするので、タイムアウト秒数を増やしておくこと
 * [http://d.hatena.ne.jp/over80/20080703/1215100867 muninの設定(つづき) - 玉虫色に染まれ！]
 > * sensors_fan のアラートを消す
 > * ping プラグインの追加
 > * 複数のグラフを1つにまとめる
 * [http://www.maruko2.com/mw/rrdtool_%E3%81%AE_RRD_%E3%81%AF%E3%82%A2%E3%83%BC%E3%82%AD%E3%83%86%E3%82%AF%E3%83%81%E3%83%A3%E3%81%8C%E7%95%B0%E3%81%AA%E3%82%8B%E3%81%A8%E4%BD%BF%E7%94%A8%E3%81%A7%E3%81%8D%E3%81%AA%E3%81%84 rrdtool の RRD はアーキテクチャが異なると使用できない - maruko2 Note.]
 > この場合、XML 形式に書き出した後、バイナリ形式の RRD として読み込めばよい。

 * [http://pocketstudio.jp/log3/2012/02/09/how_to_use_munin-cgi-graph/ MuninのグラフをCGIリアルタイム生成して負荷軽減する方法(munin-cgi-graph) | Pocketstudio.jp log3]
 > 5. CGI 版のバグに対する対処（ここがハマりどころ）
  * 1.4.6-3ubuntu3.4 では修正済の模様

 * [http://buty4649.hatenablog.com/entries/2014/07/25 muninグラフで夜間帯に色を付ける]

 = munin 2.0 =
 * デフォルトではpngによるグラフ画像は生成されなくなった模様
 * [http://munin-monitoring.org/wiki/CgiHowto2 CgiHowto2 - Munin - Trac]

 * /var/log/munin/munin-graph.log
{{{
2012/10/06 22:10:08 Opened log file
2012/10/06 22:10:08 [PERL WARNING] Use of uninitialized value in concatenation (.) or string at /usr/share/munin/munin-graph line 74.
2012/10/06 22:10:08 [PERL WARNING] Use of uninitialized value $graph_fh in <HANDLE> at /usr/share/munin/munin-graph line 75.
2012/10/06 22:10:08 [PERL WARNING] readline() on unopened filehandle at /usr/share/munin/munin-graph line 75.
}}}
  * バグ？
  * [http://comments.gmane.org/gmane.comp.db.rddtool.munin.general/7443 User support list for the munin RRD graphing front end]
   * [https://github.com/munin-monitoring/munin/commit/fd27d4c fix munin-graph typo in opening $graph_fh · fd27d4c · munin-monitoring/munin]
  * /usr/share/munin/munin-graph
{{{#!perl
my $graph_fh = new IO::File($config->{libdir} . "/graphs");
}}}
  * ~~/etc/munin/munin.conf に次の一文を追加すればとりあえずエラーは出なくなる~~
{{{
libdir /var/lib/munin
}}}
  * 別のエラーを引き起こす
  * /usr/bin/munin-cron
{{{
2012/10/09 17:47:46 [ERROR] config error under [] for 'libdir /var/lib/munin' : Parse error in /etc/munin/munin.conf for libdir:
 Unknown keyword at end of left hand side of line 9 (libdir )
 at /usr/share/munin/munin-update line 49
ERROR: Failed to parse config file '/etc/munin/munin.conf': [ERROR] config error under [] for 'libdir /var/lib/munin' : Parse error in /etc/munin/munin.conf for libdir:
 Unknown keyword at end of left hand side of line 9 (libdir )
 at /usr/share/munin/munin-update line 49
 at /usr/share/munin/munin-update line 49
}}}

 = counter vs derive =
 * [http://munin-monitoring.org/wiki/fieldname.type fieldname.type – Munin]
 * [http://munin-monitoring.org/wiki/HowToWritePlugins#DERIVEvs.COUNTER HowToWritePlugins – Munin]
 > To avoid spikes in the graph when counters are reset (as opposed to wrapping), use {{{${name}.type}}} DERIVE and {{{${name}.min}}} 0.
 * [http://atmarkit.mine.nu/blog/?p=840 munin×JMXでColdFusionのJVMをモニタリングする | @哀T]
 > ==== 追記：GAUGE、COUNTER、DERIVE、ABSOLUTEの違いについて

 = change interval =
 * [http://serverfault.com/questions/165104/showing-a-longer-timespan-in-munin graph - Showing a longer timespan in Munin - Server Fault]
 * [http://munin-monitoring.org/wiki/format-graph_data_size format-graph_data_size – Munin]
 * [http://munin-monitoring.org/ticket/1282 #1282 (update_rate needs documentation) – Munin]
  * [http://www.justinsilver.com/technology/linux/change-interval-munin-existing-rrd-data/ Change Interval in Munin With Existing RRD Data - Justin Silver]
 * [http://blog.pwkf.org/post/2010/08/Waiting-for-Munin-2.0-Keep-more-data-with-custom-data-retention-plans Waiting for Munin 2.0 - Keep more data with custom data retention plans - Personal Workflow Blog]

 = Windows =
 * http://munin-monitoring.org/wiki/HowToMonitorWindows
  * http://code.google.com/p/munin-nude-win32/
  * github:munin-monitoring/munin-node-win32
  * github:rrzefox/munin-node-win32/tree/recompile forked version
  * http://www.iversendata.no/snmagent/

 * [http://qiita.com/murachi1208/items/20c7ba20009f47568c68 Serf を使用した Munin-node 自動追加, ついでに Winodws8 に Munin-nodeいれてみる - Qiita]

 * [http://hydra.geht.net/tino/howto/monitoring/munin/win/ Windows]
{{{
[MuninNode]
PortNumber=4949
LogConnections=1
MasterAddress=*
}}}

 * [http://www.aska-inet.co.jp/business/download/munin.html Munin Node for Windows x64]

 = plugins =
 * standard plugin list => [./plugins]

 * https://github.com/renard/munin-exchange-plugins/blob/master/munin-exchange/cpuspeed2
  * [http://docs.fedoraproject.org/ja-JP/Fedora/14/html/Power_Management_Guide/tuning_cpufreq_policy_and_speed.html 3.2.3. CPUfreq のポリシーと速度のチューニング]

 * [http://www.linuxquestions.org/questions/programming-9/bash-scripting-for-iptables-munin-760352/ Bash-scripting for iptables/munin]
 > > I am trying to write this munin script to log all the accepted TCP/UDP/ICMP packets that are comming trough my iptable firewall.
 > {{{
 > echo tcp.value `iptables -vxL | grep 'ACCEPT.*tcp' | cut -c1-8`
 > }}}

 * [https://ostlogd.spenneberg.net/wordpress/?p=220 IPTables und Munin analysieren Netzwerktraffic]

 * [http://munin-monitoring.org/ticket/1341 #1341 (cpuspeed plugin doesn't work with new p-state) – Munin]
 > Since linux-3.9 there is a new intel cpufreq scaling driver which does not provide "/sys/devices/system/cpu/cpu6/cpufreq/stats/time_in_state".
 > Instead you will find "/sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_cur_freq" showing the current frequency:
 > # cat /sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_cur_freq
 > 1598000
 * https://www.kernel.org/doc/Documentation/cpu-freq/pcc-cpufreq.txt
 * https://www.kernel.org/doc/Documentation/cpu-freq/user-guide.txt
  * [http://forums.debian.net/viewtopic.php?f=5&t=50517#p290654 Debian User Forums • View topic - lenny & disable CPU frequency scaling on Core i7]
  * [https://www.pantz.org/software/cpufreq/usingcpufreqonlinux.html CPU frequency scaling in Linux with cpufreq]

 * github:SweBarre/munin-lvm
 * github:kvisle/munin-plugins

 * [http://pocketstudio.jp/log3/2012/05/21/aws-estimated-charge-munin-plugin/ AWS利用料金グラフ化Muninプラグインを書いてみた（ ＾ω＾） | Pocketstudio.jp log3]

 * [https://github.com/munin-monitoring/munin/issues/771 Unable to determine eth0 interface speed on KVM guest with if_ plugin · Issue #771 · munin-monitoring/munin]
  * https://github.com/munin-monitoring/munin/commit/f982751a
  * https://github.com/munin-monitoring/munin/blob/master/plugins/node.d.linux/if_#L93
  * [https://www.archlinux.org/packages/extra/any/munin-node/ ArchLinux] ではまだ修正版が適用されていない模様 (munin-node 2.0.26-2)
  > {{{
  > $ cat /sys/class/net/ens3/speed
  > -1
  > }}}

 == minecraft ==
 * [http://wiki.natenom.name/minecraft/munin-plugin Minecraft Munin-Plugin [wiki.natenom.name]]
  * github:Natenom/munin-plugins
 * github:wckd/Dev/tree/master/Minecraft
  * requred: github:rmichela/MCStats2
 * [http://blog.thefinn93.com/2012/11/munin-plugins-for-minecraft.html Munin Plugins for Minecraft | Finn's Blog]
  * github:thefinn93/munin-minecraft
  * http://www.wiki.vg/Rcon
  * github:barneygale/MCRcon

 == diskstats ==
 * [http://serverfault.com/questions/645331/what-is-the-counter-type-for-linuxs-sys-block-device-stat performance - What is the counter type for Linux's /sys/block/$DEVICE/stat - Server Fault]
 * [http://lister.munin-monitoring.org/pipermail/commits/2013-November/001458.html (git/munin-dev) devel: This corrects the truncating of negative values in the diskstats plugin and calculates its value based on the evidence that this is a overflow value. (91a9e62)]