97 lines
2.3 KiB
Bash
Executable File
97 lines
2.3 KiB
Bash
Executable File
#!/bin/bash
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#
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# Plugin to monitor PostgreSQL backends by database.
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# (Draws a line for each database and a total with suitable warning and critical values)
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#
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# Author:
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# Dave Fennel <dave@microtux.co.uk>
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#
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# Created:
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# 21st Feb 2013
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#
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# License:
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# GPLv2
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#
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# Usage:
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# Place in /etc/munin/plugins/ (or link it there using ln -s)
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#
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# General info:
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# Requires permission for database access and read (no writes are processed).
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# Recommended user is PostgreSQL database owner (default: postgres).
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#
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dbserver='' # '-h localhost'
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dbuser='postgres'
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# The psql command to use.
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cmd="psql ${dbserver} -U ${dbuser} -tc 'SELECT datname,numbackends FROM pg_stat_database;' | grep -v '^$'"
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if [ "$1" = "config" ]; then
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maximum=$(psql ${dbserver} -U ${dbuser} -tc "SHOW max_connections;" | bc)
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reserved=$(psql ${dbserver} -U ${dbuser} -tc "SHOW superuser_reserved_connections;" | bc)
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warning=$(((maximum-reserved)*70/100))
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critical=$(((maximum-reserved)*90/100))
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echo 'graph_args --base 1000 --lower-limit 0' # --upper-limit '${maximum}
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echo 'graph_category Postgresql'
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echo 'graph_info Shows open backends for each database on the server'
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echo 'graph_scale no'
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echo 'graph_title PostgreSQL Active Backends By Database'
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echo 'graph_vlabel Number of active backends'
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pools=""
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while read pool sep backends junk
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do
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test -z "${pool}" && continue
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# Skip pgbouncer database itself.
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if [ "$pool" = "template0" ]; then
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continue
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fi
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if [ "$pool" = "template1" ]; then
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continue
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fi
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echo ${pool}.label ${pool}
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echo ${pool}.info ${pool} active backends
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echo ${pool}.draw LINE2
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pools="${pools} $pool"
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done < <(eval ${cmd})
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echo total.label total
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echo total.info total active backends
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echo total.draw AREA
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echo total.colour AFCACA
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echo total.sum ${pools}
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echo total.warning ${warning}
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echo total.critical ${critical}
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# If dirty config capability is enabled then fall through
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# to output the data with the config information.
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if [ "$MUNIN_CAP_DIRTYCONFIG" = "" ]; then
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exit 0
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fi
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fi
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while read pool sep backends junk
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do
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test -z "${pool}" && continue
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# Skip template databases.
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if [ "$pool" = "template0" ]; then
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continue
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fi
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if [ "$pool" = "template1" ]; then
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continue
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fi
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echo ${pool}.value ${backends}
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done < <(eval ${cmd})
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