#!/usr/bin/env ruby # encoding: utf-8 # Plugin to monitor Room Alert 11E environmental units. # Requires ruby and the ruby SNMP library. # # Written by Phil Gold . # # Usage: Copy or link into /etc/munin/node.d/. End word can be either # "temperature" or "humidity". # # Parameters: # # config (required) # autoconf (optional - used by munin-config) # # Config variables: # # units - DNS names of environmental units # community - Community to use to access the Room Alert unit # Defaults to 'public'. # variables of the form label__, where dots and dashes in the # unit names are replaced with underscores - labels for specific sensors # in the unit. # e.g. env.label_192_168_1_115_2 Main Unit # # Example config: # # [room_alert_*] # env.units unit1.example.com unit2.example.com # env.community private # env.label_unit1_example_com_2 Main Unit # env.label_unit1_example_com_3 Rack 2 Sensor require 'snmp' base_oid = "enterprises.20916.1.3.1" case $0.match('[^_]+$')[0] when "temperature" subchannel = 1 name = "temperature" label = "°C" letter = "t" when "humidity" subchannel = 3 name = "humidity" label = "% Relative Humidity" letter = "h" else exit 1 end def is_vb_valid(vb, subchannel) return (vb.name[-1] == 0 and vb.name[-2] == subchannel and vb.value > 1) end def field_name(unit, vb, letter) clean_unit = unit.gsub(/[.-]/, '_') sensor = vb.name[-3].to_s return "#{clean_unit}_#{letter}#{sensor}" end def label(unit, vb) clean_unit = unit.gsub(/[.-]/, '_') sensor = vb.name[-3].to_s label = "#{unit} " + (ENV["label_#{clean_unit}_#{sensor}"] || "sensor #{sensor}") end units = (ENV['units'] || "").split(/\s+/) community = ENV['community'] || "public" case ARGV[0] when "autoconf" puts "no" exit 0 when "config" puts "graph_title Room Alert 11E units (#{name} probes)" puts "graph_vlabel #{label}" puts "graph_category sensors" if name == "humidity" puts "graph_args --lower-limit 0 --upper-limit 100" end units.each do |unit| SNMP::Manager.open(:Host => unit, :Community => community, :Version => :SNMPv1) do |manager| manager.walk(base_oid) do |vb| if not is_vb_valid(vb, subchannel) next end puts "#{field_name(unit, vb, letter)}.label #{label(unit, vb)}" end end end exit 0 end units.each do |unit| SNMP::Manager.open(:Host => unit, :Community => community, :Version => :SNMPv1) do |manager| manager.walk(base_oid) do |vb| if not is_vb_valid(vb, subchannel) next end puts "#{field_name(unit, vb, letter)}.value #{vb.value.to_f / 100}" end end end