77 lines
2.4 KiB
Bash
Executable File
77 lines
2.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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# nscd (name server caching daemon) statistics
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#
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# Tested with nscd 2.13 on Debian 7.8
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#
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# This plugin is capable to show:
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# - per-database (passwd, group, hosts, services):
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# - Suggested size
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# - Cache hit rate
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# - Number of currently cached values
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# - Number of max cached values
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#
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# Required permissions:
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# - root permissions to run "nscd -g"
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#
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# OS: *NIX
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#
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# Author: Oliver Ladner <waste@lugh.ch>
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#
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# Configuration:
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# - set env.nscd_cfg to nscd.conf path if necessary
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# - Configure to run as root in /etc/munin/plugin-conf.d/munin-node
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# [nscd_*]
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# user root
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#
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# Notes:
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#
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# A low cache hit rate in combination with a shared cache configuration is
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# normal, as clients can search the cache directly without asking the nscd
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# daemon first. See http://goo.gl/dkwzDH
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#%# family=auto
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#%# capabilities=autoconf suggest
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. "$MUNIN_LIBDIR/plugins/plugin.sh"
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NSCD_CFG=${nscd_cfg:-/etc/nscd.conf}
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AUTOCONF_CHECK=$(nscd -g | grep -ic 'yes.*cache is enabled')
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SUGGEST_CHECK=$(nscd -g | grep -iB2 'yes.*cache is enabled' | awk '{print $1}' | head -1)
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MODE=$(basename "$0" | sed 's/^nscd_//g' | tr '_' '.')
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case $1 in
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autoconf)
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if [ -r "$NSCD_CFG" ] && [ "$AUTOCONF_CHECK" -gt 0 ]; then
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echo yes
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else
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echo "no (nscd config not found or no database enabled)"
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fi
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exit 0
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;;
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suggest)
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echo "$SUGGEST_CHECK"
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exit 0
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;;
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config)
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# --lower-limit needs to be > 0 for logarithmic scaling
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cat <<CONFIG
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graph_args --base 1000 --lower-limit 0
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graph_scale yes
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graph_title nscd - ${MODE//_/ } cache
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graph_info This graph shows nscd $MODE statistics
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graph_vlabel % or count
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suggestedsize.label Suggested size
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cachehitrate.label Cache hit rate in %
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cachehitrate.info A low cache hit rate in combination with a shared cache configuration is normal, as clients can search the cache directly without asking the nscd daemon first
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currnumber.label Current number of cached values
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maxnumber.label Maximum number of cached values
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graph_category system
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CONFIG
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;;
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fetch|*)
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nscd -g | awk "/^$MODE cache/ {printline = 1; print; next} /^.*cache:/ {printline = 0} printline" | \
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grep -E '(suggested size|cache hit rate|current number of cached values|maximum number of cached values)' | \
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sed 's/%//' | awk '{ if (NR==1) print "suggestedsize.value " $1; if (NR==2) print "cachehitrate.value " $1; if (NR==3) print "currnumber.value " $1; if (NR==4) print "maxnumber.value " $1}'
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;;
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esac
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