Class: OsCtld::Lxcfs::Scheduler

Inherits:
Object
  • Object
show all
Includes:
OsCtl::Lib::Utils::File, OsCtl::Lib::Utils::Log, OsCtld::Lockable, Singleton
Defined in:
lib/osctld/lxcfs/scheduler.rb

Overview

Assigns containers to LXCFS workers

Constant Summary collapse

STATE_FILE = 
File.join(RunState::LXCFS_DIR, 'scheduler.yml')

Instance Method Summary collapse

Methods included from OsCtld::Lockable

#exclusively, included, #inclusively, #init_lock, #lock, #unlock

Constructor Details

#initialize ⇒ Scheduler

Returns a new instance of Scheduler.



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# File 'lib/osctld/lxcfs/scheduler.rb', line 26

def initialize
  init_lock
  @workers = {}
  @containers = {}
  @worker_id = 0
  @save_queue = OsCtl::Lib::Queue.new
  @gc_queue = OsCtl::Lib::Queue.new
end

Instance Method Details

#add_legacy_perct_worker(ctrc) ⇒ Lxcfs::Worker

Parameters:

Returns:



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# File 'lib/osctld/lxcfs/scheduler.rb', line 154

def add_legacy_perct_worker(ctrc)
  worker = nil

  exclusively do
    name = "ct.#{ctrc.ident}"
    return @workers[name] if @workers.has_key?(name)

    lxcfs = ctrc.ct.lxcfs

    worker = Lxcfs::Worker.new(
      name,
      max_size: 1,
      loadavg: lxcfs.loadavg,
      cfs: lxcfs.cfs,
      enabled: false,
    )
    worker.add_user

    @workers[worker.name] = worker
    @containers[ctrc.ident] = worker
    @worker_id += 1

    log(:info, "#{ctrc.ident} created legacy worker #{worker.name}")
  end

  worker.adjust_legacy_worker

  request_save
  worker
end

#assets(add) ⇒ Object 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 35

def assets(add)
  add.directory(
    RunState::LXCFS_DIR,
    desc: 'osctl-lxcfs root directory',
    user: 0,
    group: 0,
    mode: 0711,
  )
  add.directory(
    Lxcfs::Server::RUNDIR_SERVERS,
    desc: 'LXCFS runit services',
    user: 0,
    group: 0,
    mode: 0755,
  )
  add.directory(
    Lxcfs::Server::RUNDIR_RUNSVDIR,
    desc: 'LXCFS runsv directory',
    user: 0,
    group: 0,
    mode: 0755,
  )
  add.directory(
    Lxcfs::Server::RUNDIR_MOUNTROOT,
    desc: 'LXCFS mount root',
    user: 0,
    group: 0,
    mode: 0755,
  )
  add.file(
    STATE_FILE,
    desc: 'Lxcfs scheduler state',
    user: 0,
    group: 0,
    mode: 0400,
    optional: true,
  )

  @workers.each_value do |w|
    w.assets(add)
  end
end

#assign_ctrc(ctrc) ⇒ Object

Assign container to a LXCFS worker

This method blocks until the LXCFS instance is available for use.

Parameters:

Raises:



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# File 'lib/osctld/lxcfs/scheduler.rb', line 106

def assign_ctrc(ctrc)
  return unless ctrc.ct.lxcfs.enable

  worker, created = get_or_create_worker(ctrc)
  worker.start if created
  request_save
  worker.wait
  ctrc.lxcfs_worker = worker
  ctrc.save
  nil
end

#change_worker(name) {|| ... } ⇒ Object

Parameters:

  • name (String)

Yield Parameters:

Raises:



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# File 'lib/osctld/lxcfs/scheduler.rb', line 144

def change_worker(name)
  worker = inclusively { @workers[name] }
  raise Lxcfs::WorkerNotFound, name if worker.nil?
  ret = yield(worker)
  request_save
  ret
end

#do_prune_workers ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 350

def do_prune_workers
  to_destroy = []

  exclusively do
    now = Time.now

    @workers.each do |name, worker|
      if worker.unused? && (worker.last_used.nil? || worker.last_used + 60 < now)
        log(:info, "Disabling unused #{name}")
        @workers.delete(name)
        to_destroy << worker
      end
    end
  end

  request_save if to_destroy.any?

  to_destroy.each do |worker|
    log(:info, "Destroying unused #{worker.name}")
    worker.destroy
  end
end

#dump_state ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 257

def dump_state
  inclusively do
    worker_cts = {}

    @containers.each do |ctid, worker|
      worker_cts[worker.name] ||= []
      worker_cts[worker.name] << ctid
    end

    {
      'worker_id' => @worker_id,
      'workers' => @workers.each_value.map do |w|
        {
          'options' => w.dump,
          'containers' => worker_cts[w.name] || [],
        }
      end,
    }
  end
end

#export_workers ⇒ Object 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 189

def export_workers
  inclusively { @workers.each_value.map(&:export) }
end

#gen_worker_name(cpu_package) ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 251

def gen_worker_name(cpu_package)
  ret = "worker.#{@worker_id}."
  ret << (cpu_package ? "cpu#{cpu_package}" : 'cpuall')
  ret
end

#get_or_create_worker(ctrc) ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 198

def get_or_create_worker(ctrc)
  worker = nil
  existing = false
  created = false

  exclusively do
    existing_worker = @containers[ctrc.ident]

    if existing_worker
      if existing_worker.can_handle_ctrc?(ctrc, check_size: false)
        worker = existing_worker
        existing = true
        log(:info, "#{ctrc.ident} kept on #{worker.name}")
        next
      else
        existing_worker.remove_user
        @containers.delete(ctrc.ident)
        log(:info, "#{ctrc.ident} needs to be reassigned from #{existing_worker.name}")
      end
    end

    worker =
      @workers.each_value.select do |w|
        w.can_handle_ctrc?(ctrc)
      end.sort do |a, b|
        b.size <=> a.size
      end.first

    if worker.nil?
      created = true
      name = nil

      loop do
        name = gen_worker_name(ctrc.cpu_package)
        @worker_id += 1
        break unless @workers.has_key?(name)
      end

      worker = Lxcfs::Worker.new_for_ctrc(name, ctrc)
      @workers[worker.name] = worker

      log(:info, "Creating new worker #{worker.name} for #{ctrc.ident}")
    else
      log(:info, "#{ctrc.ident} assigned to existing #{worker.name}")
    end

    @containers[ctrc.ident] = worker
  end

  worker.add_user unless existing
  [worker, created]
end

#load_state ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 288

def load_state
  begin
    data = OsCtl::Lib::ConfigFile.load_yaml_file(STATE_FILE)
  rescue Errno::ENOENT
    return
  end

  data['workers'].each do |w_data|
    worker = Lxcfs::Worker.load(w_data['options'])
    @workers[worker.name] = worker

    w_data['containers'].each do |ctid|
      worker.add_user
      @containers[ctid] = worker
    end

    worker.setup
  end

  @worker_id = data.fetch('worker_id', @workers.size)
end

#log_type ⇒ Object 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 193

def log_type
  @log_type ||= 'lxcfs-scheduler'
end

#prune_workers ⇒ Object 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 185

def prune_workers
  request_prune
end

#remove_ct(ct) ⇒ Object

Parameters:



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# File 'lib/osctld/lxcfs/scheduler.rb', line 119

def remove_ct(ct)
  worker = nil

  exclusively do
    worker = @containers[ct.ident]
    return if worker.nil?

    worker.remove_user
    @containers.delete(ct.ident)
  end

  request_save

  nil
end

#request_destroy(worker) ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 310

def request_destroy(worker)
  @gc_queue << [:destroy, worker]
end

#request_prune ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 314

def request_prune
  @gc_queue << [:prune]
end

#request_save ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 318

def request_save
  @save_queue << :save
end

#run_gc ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 332

def run_gc
  loop do
    cmd, *args = @gc_queue.pop(timeout: 60)

    case cmd
    when :stop
      return

    when :destroy
      worker = args[0]
      worker.destroy

    when :prune, nil
      do_prune_workers
    end
  end
end

#run_save ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 322

def run_save
  loop do
    cmd = @save_queue.pop
    return if cmd == :stop

    save_state
    sleep(1)
  end
end

#save_state ⇒ Object (protected) 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 278

def save_state
  data = dump_state

  regenerate_file(STATE_FILE, 0400) do |new|
    new.write(OsCtl::Lib::ConfigFile.dump_yaml(data))
  end

  File.chown(0, 0, STATE_FILE)
end

#setup ⇒ Object 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 78

def setup
  load_state
  @save_thread = Thread.new { run_save }
  @gc_thread = Thread.new { run_gc }
end

#stop ⇒ Object 



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# File 'lib/osctld/lxcfs/scheduler.rb', line 84

def stop
  if @save_thread
    @save_queue.clear
    @save_queue << :stop
    @save_thread.join
    @save_thread = nil
  end

  if @gc_thread
    @gc_queue.clear
    @gc_queue << [:stop]
    @gc_thread.join
    @gc_thread = nil
  end
end

#worker_by_name(name) ⇒ Lxcfs::Worker?

Parameters:

  • name (String)

Returns:



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# File 'lib/osctld/lxcfs/scheduler.rb', line 137

def worker_by_name(name)
  inclusively { @workers[name] }
end