Class: Fluent::Plugin::DockerStatsInput

Inherits:
Input
  • Object
show all
Defined in:
lib/fluent/plugin/in_docker_stats.rb

Defined Under Namespace

Classes: TimerWatcher

Instance Method Summary collapse

Constructor Details

#initialize ⇒ DockerStatsInput

Returns a new instance of DockerStatsInput.



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# File 'lib/fluent/plugin/in_docker_stats.rb', line 14

def initialize
  super
  puts "Found Docker details: #{Docker.version}"
  puts "Using interval: #{@stats_interval}"
  puts "Using tag: #{@tag}"
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_docker_stats.rb', line 21

def configure(conf)
  super
end

#emit_container_stats(container_id) ⇒ Object 



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# File 'lib/fluent/plugin/in_docker_stats.rb', line 46

def emit_container_stats(container_id)
  container = Docker::Container.get(container_id)

  record = {
    "container_id": container_id,
    "container_name": container.info['Name'].sub(/^\//, ''),
    "created_time": container.info["Created"]
  }

  state = container.info['State']
  record["status"] = state['Status']
  record["is_running"] = state['Running']
  record["is_restarting"] = state['Restarting']
  record["is_paused"] = state['Paused']
  record["is_oom_killed"] = state['OOMKilled']
  record["started_time"] = state['StartedAt']
  record["finished_time"] = state['FinishedAt']

  stats = container.stats(stream: false)

  memory_stats = stats['memory_stats']
  record["mem_usage"] = memory_stats['usage']
  record["mem_limit"] = memory_stats['limit']
  record["mem_max_usage"] = memory_stats['max_usage']

  cpu_stats, = stats['cpu_stats']
  cpu_usage = cpu_stats['cpu_usage']

  cpu_system_usage = cpu_stats['system_cpu_usage']
  cpu_total_usage = cpu_usage['total_usage']
  cpu_percent = (cpu_total_usage.to_f / cpu_system_usage.to_f) * 100

  record["cpu_system_usage"] = cpu_system_usage
  record["cpu_total_usage"] = cpu_total_usage
  record["cpu_percent"] = cpu_percent

  record["networks"] = []
  stats['networks'].each do |network_name, network_info|
    record["networks"] << {
      "network_name": network_name,
      "rx": network_info['rx_bytes'],
      "tx": network_info['tx_bytes'],
    }
  end

  storage_stats = stats['storage_stats']
  if stats['storage_stats'] && !stats['storage_stats'].empty?
    record["volumes"] = []
    volume_stats = storage_stats['volumes']
    volume_stats.each do |volume_name, volume_info|
      puts "Volume #{volume_name} - Used: #{volume_info['used']} bytes, Total: #{volume_info['total']} bytes"
      record["volumes"] << {
        "volume_name": volume_name,
        "volume_used": volume_info['used'],
        "volume_total": volume_info['total'],
      }
    end
  end

  router.emit(@tag, Fluent::Engine.now, record)
end

#get_metrics ⇒ Object 



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# File 'lib/fluent/plugin/in_docker_stats.rb', line 39

def get_metrics
  ids = @container_ids || list_container_ids
  ids.each do |container_id|
    emit_container_stats(container_id)
  end
end

#list_container_ids ⇒ Object 



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# File 'lib/fluent/plugin/in_docker_stats.rb', line 108

def list_container_ids
  Docker::Container.all.map do |container|
    container.id
  end
end

#run ⇒ Object 



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# File 'lib/fluent/plugin/in_docker_stats.rb', line 32

def run
  @loop.run
rescue
  log.error "unexpected error", :error => $!.to_s
  log.error_backtrace
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_docker_stats.rb', line 114

def shutdown
  @loop.stop
  @thread.join
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/in_docker_stats.rb', line 25

def start
  @loop = Coolio::Loop.new
  tw = TimerWatcher.new(@stats_interval, true, @log, &method(:get_metrics))
  tw.attach(@loop)
  @thread = Thread.new(&method(:run))
end