Exemplo n.º 1
0
// Create creates a scheduler and all support functions.
func (factory *ConfigFactory) Create() *scheduler.Config {
	// Watch and queue pods that need scheduling.
	podQueue := cache.NewFIFO()
	cache.NewReflector(factory.createUnassignedPodLW(), &api.Pod{}, podQueue).Run()

	// Watch and cache all running pods. Scheduler needs to find all pods
	// so it knows where it's safe to place a pod. Cache this locally.
	podCache := cache.NewStore()
	cache.NewReflector(factory.createAssignedPodLW(), &api.Pod{}, podCache).Run()

	// Watch minions.
	// Minions may be listed frequently, so provide a local up-to-date cache.
	minionCache := cache.NewStore()
	if false {
		// Disable this code until minions support watches.
		cache.NewReflector(factory.createMinionLW(), &api.Minion{}, minionCache).Run()
	} else {
		cache.NewPoller(factory.pollMinions, 10*time.Second, minionCache).Run()
	}

	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	minionLister := &storeToMinionLister{minionCache}

	algo := algorithm.NewGenericScheduler(
		[]algorithm.FitPredicate{
			// Fit is defined based on the absence of port conflicts.
			algorithm.PodFitsPorts,
			// Fit is determined by resource availability
			algorithm.NewResourceFitPredicate(minionLister),
			// Fit is determined by non-conflicting disk volumes
			algorithm.NoDiskConflict,
			// Fit is determined by node selector query
			algorithm.NewSelectorMatchPredicate(minionLister),
		},
		// Prioritize nodes by least requested utilization.
		algorithm.LeastRequestedPriority,
		&storeToPodLister{podCache}, r)

	podBackoff := podBackoff{
		perPodBackoff: map[string]*backoffEntry{},
		clock:         realClock{},
	}

	return &scheduler.Config{
		MinionLister: minionLister,
		Algorithm:    algo,
		Binder:       &binder{factory.Client},
		NextPod: func() *api.Pod {
			pod := podQueue.Pop().(*api.Pod)
			glog.V(2).Infof("About to try and schedule pod %v\n"+
				"\tknown minions: %v\n"+
				"\tknown scheduled pods: %v\n",
				pod.Name, minionCache.ContainedIDs(), podCache.ContainedIDs())
			return pod
		},
		Error: factory.makeDefaultErrorFunc(&podBackoff, podQueue),
	}
}
Exemplo n.º 2
0
func defaultPredicates() util.StringSet {
	return util.NewStringSet(
		// Fit is defined based on the absence of port conflicts.
		factory.RegisterFitPredicate("PodFitsPorts", algorithm.PodFitsPorts),
		// Fit is determined by resource availability.
		factory.RegisterFitPredicate("PodFitsResources", algorithm.NewResourceFitPredicate(factory.MinionLister)),
		// Fit is determined by non-conflicting disk volumes.
		factory.RegisterFitPredicate("NoDiskConflict", algorithm.NoDiskConflict),
		// Fit is determined by node selector query.
		factory.RegisterFitPredicate("MatchNodeSelector", algorithm.NewSelectorMatchPredicate(factory.MinionLister)),
		// Fit is determined by the presence of the Host parameter and a string match
		factory.RegisterFitPredicate("HostName", algorithm.PodFitsHost),
	)
}