riemann-lxc

#!/usr/bin/env ruby

# Reports some basic LXC container stats to Riemann

require File.expand_path('../../lib/riemann/tools', __FILE__)

class Riemann::Tools::LXC
  include Riemann::Tools

  def initialize
    @hostname = `hostname`.chomp
  end

  def tick
    File.open("/sys/fs/cgroup/memory/lxc/" + @hostname + "/memory.stat", "r") do |file|
       file.each_line do |stat|
          stat = stat.split
          send("mem #{stat[0]}", stat[1].to_i)
       end
    end

    usage = File.readlines("/sys/fs/cgroup/memory/lxc/" + @hostname + "/memory.usage_in_bytes", "r")[0]
    send("mem usage bytes", usage.to_i)

    File.open("/sys/fs/cgroup/cpuacct/lxc/" + @hostname + "/cpuacct.stat", "r") do |file|
       file.each_line do |stat|
          stat = stat.split
          send("cpu #{stat[0]}", stat[1].to_i)
       end
    end
  end

  def send(type, metric)
      report(
        :host => @hostname,
        :service => "cgroup #{type}",
        :metric => metric,
        :state => "ok",
        :description => nil
      )
  end
end

Riemann::Tools::LXC.run