111 lines
2.8 KiB
Plaintext
111 lines
2.8 KiB
Plaintext
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#!/usr/bin/ruby
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# Plugin to monitor Room Alert 11E environmental units.
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# Requires ruby and the ruby SNMP library.
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#
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# Written by Phil Gold <phil_g@pobox.com>.
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#
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# Usage: Copy or link into /etc/munin/node.d/. End word can be either
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# "temperature" or "humidity".
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#
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# Parameters:
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#
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# config (required)
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# autoconf (optional - used by munin-config)
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#
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# Config variables:
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#
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# units - DNS names of environmental units
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# community - Community to use to access the Room Alert unit
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# Defaults to 'public'.
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# variables of the form label_<unit>_<num>, where dots and dashes in the
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# unit names are replaced with underscores - labels for specific sensors
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# in the unit.
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# e.g. env.label_192_168_1_115_2 Main Unit
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#
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# Example config:
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#
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# [room_alert_*]
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# env.units unit1.example.com unit2.example.com
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# env.community private
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# env.label_unit1_example_com_2 Main Unit
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# env.label_unit1_example_com_3 Rack 2 Sensor
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require 'snmp'
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base_oid = "enterprises.20916.1.3.1"
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case $0.match('[^_]+$')[0]
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when "temperature"
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subchannel = 1
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name = "temperature"
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label = "°C"
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letter = "t"
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when "humidity"
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subchannel = 3
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name = "humidity"
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label = "% Relative Humidity"
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letter = "h"
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else
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exit 1
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end
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def is_vb_valid(vb, subchannel)
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return (vb.name[-1] == 0 and vb.name[-2] == subchannel and vb.value > 1)
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end
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def field_name(unit, vb, letter)
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clean_unit = unit.gsub(/[.-]/, '_')
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sensor = vb.name[-3].to_s
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return "#{clean_unit}_#{letter}#{sensor}"
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end
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def label(unit, vb)
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clean_unit = unit.gsub(/[.-]/, '_')
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sensor = vb.name[-3].to_s
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label = "#{unit} " + (ENV["label_#{clean_unit}_#{sensor}"] || "sensor #{sensor}")
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end
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units = (ENV['units'] || "").split(/\s+/)
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community = ENV['community'] || "public"
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case ARGV[0]
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when "autoconf"
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puts "no"
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exit 1
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when "config"
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puts "graph_title Room Alert 11E units (#{name} probes)"
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puts "graph_vlabel #{label}"
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puts "graph_category sensors"
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if name == "humidity"
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puts "graph_args --lower-limit 0 --upper-limit 100"
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end
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units.each do |unit|
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SNMP::Manager.open(:Host => unit,
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:Community => community,
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:Version => :SNMPv1) do |manager|
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manager.walk(base_oid) do |vb|
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if not is_vb_valid(vb, subchannel)
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next
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end
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puts "#{field_name(unit, vb, letter)}.label #{label(unit, vb)}"
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end
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end
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end
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exit 0
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end
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units.each do |unit|
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SNMP::Manager.open(:Host => unit,
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:Community => community,
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:Version => :SNMPv1) do |manager|
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manager.walk(base_oid) do |vb|
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if not is_vb_valid(vb, subchannel)
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next
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end
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puts "#{field_name(unit, vb, letter)}.value #{vb.value.to_f / 100}"
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end
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end
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end
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