smartctl_prometheus_exporter.rb

HOSTNAME = %x{hostname}.chomp

PROM_FILE = ARGV[0] != 'test' ? '/var/lib/node_exporter/textfile_collector/smartctl.prom' : '/tmp/smartctl.prom'

DEVICES = [
  '/dev/sda',
  '/dev/sdb',
  '/dev/sdc',
  '/dev/sdd',
  '/dev/sde',
  '/dev/sdf',
  '/dev/sdg',
  '/dev/sdh',
  '/dev/sdi',
  '/dev/sdj',
  '/dev/sdk',
  '/dev/sdl',
  '/dev/sdm'
]

class Attribute
  attr_accessor :id, :name, :flag, :value, :worst, :threshold, :type, :updated,
                :when_failed, :raw_value, :device

  def self.from_list(device, list)
    model = new(device)
    model.id          = list[0].to_i
    model.name        = list[1].downcase.tr('-','_')
    model.flag        = list[2]
    model.value       = list[3].to_i
    model.worst       = list[4].to_i
    model.threshold   = list[5].to_i
    model.type        = list[6].downcase
    model.updated     = list[7].downcase
    model.when_failed = list[8] == '-' ? 0 : list[8]
    model.raw_value   = list[9].to_i
    model
  end

  def initialize(device)
    @device = device
  end

  def to_exposition
    <<~TXT
    smartctl_#{name}_threshold{host="#{HOSTNAME}",device="#{device}",id="#{id}",flag="#{flag}",updated="#{updated}",type="#{type}"} #{threshold}
    smartctl_#{name}_worst{host="#{HOSTNAME}",device="#{device}",id="#{id}",flag="#{flag}",updated="#{updated}",type="#{type}"} #{worst}
    smartctl_#{name}_value{host="#{HOSTNAME}",device="#{device}",id="#{id}",flag="#{flag}",updated="#{updated}",type="#{type}"} #{value}
    smartctl_#{name}_raw{host="#{HOSTNAME}",device="#{device}",id="#{id}",flag="#{flag}",updated="#{updated}",type="#{type}"} #{raw_value}
    TXT
  end
end

attributes = []

DEVICES.each do |device|
  result = %x{smartctl -A #{device}}

  result.each_line do |line|
    line = line.strip
    if line =~ %r{\A\d+\s\w+}
      attributes << Attribute.from_list(device, line.split(/\s+/))
    end
  end
end

open(PROM_FILE, 'w') do |file|
  attributes.each do |a|
    file.puts a.to_exposition
  end
end

puts "completed"

smartexport.service

[Unit]
Description=Exports the smart data

[Service]
Type=oneshot
ExecStart=/usr/bin/ruby /usr/src/smartexport/run.rb

smartexport.timer

[Unit]
Description=Run the smart export tool for prometheus to consume

[Timer]
OnUnitActiveSec=30min

[Install]
WantedBy=timers.target