// RunKubelet is responsible for setting up and running a kubelet. It is used in three different applications:
// 1 Integration tests
// 2 Kubelet binary
// 3 Standalone 'kubernetes' binary
// Eventually, #2 will be replaced with instances of #3
func RunKubelet(kcfg *KubeletConfig) {
kcfg.Hostname = util.GetHostname(kcfg.HostnameOverride)
kcfg.Recorder = record.FromSource(api.EventSource{Component: "kubelet", Host: kcfg.Hostname})
if kcfg.KubeClient != nil {
kubelet.SetupEventSending(kcfg.KubeClient, kcfg.Hostname)
} else {
glog.Infof("No api server defined - no events will be sent.")
}
kubelet.SetupLogging()
kubelet.SetupCapabilities(kcfg.AllowPrivileged)
credentialprovider.SetPreferredDockercfgPath(kcfg.RootDirectory)
podCfg := makePodSourceConfig(kcfg)
k, err := createAndInitKubelet(kcfg, podCfg)
if err != nil {
glog.Errorf("Failed to create kubelet: %s", err)
return
}
// process pods and exit.
if kcfg.Runonce {
if _, err := k.RunOnce(podCfg.Updates()); err != nil {
glog.Errorf("--runonce failed: %v", err)
}
} else {
startKubelet(k, podCfg, kcfg)
}
}
func createPodConfigTester(mode PodConfigNotificationMode) (chan<- interface{}, <-chan kubelet.PodUpdate, *PodConfig) {
config := NewPodConfig(mode, record.FromSource(api.EventSource{Component: "kubelet"}))
channel := config.Channel(TestSource)
ch := config.Updates()
return channel, ch, config
}
// Creates a scheduler from a set of registered fit predicate keys and priority keys.
func (f *ConfigFactory) CreateFromKeys(predicateKeys, priorityKeys util.StringSet) (*scheduler.Config, error) {
glog.V(2).Infof("creating scheduler with fit predicates '%v' and priority functions '%v", predicateKeys, priorityKeys)
pluginArgs := PluginFactoryArgs{
PodLister: f.PodLister,
ServiceLister: f.ServiceLister,
NodeLister: f.NodeLister,
NodeInfo: f.NodeLister,
}
predicateFuncs, err := getFitPredicateFunctions(predicateKeys, pluginArgs)
if err != nil {
return nil, err
}
priorityConfigs, err := getPriorityFunctionConfigs(priorityKeys, pluginArgs)
if err != nil {
return nil, err
}
// Watch and queue pods that need scheduling.
cache.NewReflector(f.createUnassignedPodLW(), &api.Pod{}, f.PodQueue, 0).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.
cache.NewReflector(f.createAssignedPodLW(), &api.Pod{}, f.ScheduledPodLister.Store, 0).Run()
// Watch minions.
// Minions may be listed frequently, so provide a local up-to-date cache.
if false {
// Disable this code until minions support watches. Note when this code is enabled,
// we need to make sure minion ListWatcher has proper FieldSelector.
cache.NewReflector(f.createMinionLW(), &api.Node{}, f.NodeLister.Store, 0).Run()
} else {
cache.NewPoller(f.pollMinions, 10*time.Second, f.NodeLister.Store).Run()
}
// Watch and cache all service objects. Scheduler needs to find all pods
// created by the same service, so that it can spread them correctly.
// Cache this locally.
cache.NewReflector(f.createServiceLW(), &api.Service{}, f.ServiceLister.Store, 0).Run()
r := rand.New(rand.NewSource(time.Now().UnixNano()))
algo := algorithm.NewGenericScheduler(predicateFuncs, priorityConfigs, f.PodLister, r)
podBackoff := podBackoff{
perPodBackoff: map[string]*backoffEntry{},
clock: realClock{},
defaultDuration: 1 * time.Second,
maxDuration: 60 * time.Second,
}
return &scheduler.Config{
Modeler: f.modeler,
MinionLister: f.NodeLister,
Algorithm: algo,
Binder: &binder{f.Client},
NextPod: func() *api.Pod {
pod := f.PodQueue.Pop().(*api.Pod)
glog.V(2).Infof("About to try and schedule pod %v", pod.Name)
return pod
},
Error: f.makeDefaultErrorFunc(&podBackoff, f.PodQueue),
Recorder: record.FromSource(api.EventSource{Component: "scheduler"}),
}, nil
}
func TestScheduler(t *testing.T) {
defer record.StartLogging(t.Logf).Stop()
errS := errors.New("scheduler")
errB := errors.New("binder")
table := []struct {
injectBindError error
sendPod *api.Pod
algo scheduler.Scheduler
expectErrorPod *api.Pod
expectAssumedPod *api.Pod
expectError error
expectBind *api.Binding
eventReason string
}{
{
sendPod: podWithID("foo", ""),
algo: mockScheduler{"machine1", nil},
expectBind: &api.Binding{ObjectMeta: api.ObjectMeta{Name: "foo"}, Target: api.ObjectReference{Kind: "Node", Name: "machine1"}},
expectAssumedPod: podWithID("foo", "machine1"),
eventReason: "scheduled",
}, {
sendPod: podWithID("foo", ""),
algo: mockScheduler{"machine1", errS},
expectError: errS,
expectErrorPod: podWithID("foo", ""),
eventReason: "failedScheduling",
}, {
sendPod: podWithID("foo", ""),
algo: mockScheduler{"machine1", nil},
expectBind: &api.Binding{ObjectMeta: api.ObjectMeta{Name: "foo"}, Target: api.ObjectReference{Kind: "Node", Name: "machine1"}},
injectBindError: errB,
expectError: errB,
expectErrorPod: podWithID("foo", ""),
eventReason: "failedScheduling",
},
}
for i, item := range table {
var gotError error
var gotPod *api.Pod
var gotAssumedPod *api.Pod
var gotBinding *api.Binding
c := &Config{
Modeler: &FakeModeler{
AssumePodFunc: func(pod *api.Pod) {
gotAssumedPod = pod
},
},
MinionLister: scheduler.FakeMinionLister(
api.NodeList{Items: []api.Node{{ObjectMeta: api.ObjectMeta{Name: "machine1"}}}},
),
Algorithm: item.algo,
Binder: fakeBinder{func(b *api.Binding) error {
gotBinding = b
return item.injectBindError
}},
Error: func(p *api.Pod, err error) {
gotPod = p
gotError = err
},
NextPod: func() *api.Pod {
return item.sendPod
},
Recorder: record.FromSource(api.EventSource{Component: "scheduler"}),
}
s := New(c)
called := make(chan struct{})
events := record.GetEvents(func(e *api.Event) {
if e, a := item.eventReason, e.Reason; e != a {
t.Errorf("%v: expected %v, got %v", i, e, a)
}
close(called)
})
s.scheduleOne()
if e, a := item.expectAssumedPod, gotAssumedPod; !reflect.DeepEqual(e, a) {
t.Errorf("%v: assumed pod: wanted %v, got %v", i, e, a)
}
if e, a := item.expectErrorPod, gotPod; !reflect.DeepEqual(e, a) {
t.Errorf("%v: error pod: wanted %v, got %v", i, e, a)
}
if e, a := item.expectError, gotError; !reflect.DeepEqual(e, a) {
t.Errorf("%v: error: wanted %v, got %v", i, e, a)
}
if e, a := item.expectBind, gotBinding; !reflect.DeepEqual(e, a) {
t.Errorf("%v: error: %s", i, util.ObjectDiff(e, a))
}
<-called
events.Stop()
}
}