func main() {
glog.V(0).Info("Kubernetes-Resque Worker Cleanup Service")
kubeClient, err := getKubernetesClient()
if err != nil {
glog.Fatal(errors.Wrap(err, "Unable to create kubernetes client").Error())
}
podLister := kube_util.NewScheduledPodLister(kubeClient)
redisClient := getRedisClient()
ticker := time.NewTicker(time.Minute * 5)
defer ticker.Stop()
for _ = range ticker.C {
glog.V(1).Infof("starting cleanup at %v...", time.Now())
kubernetesWorkers, err := getWorkersFromKubernetes(podLister)
if err != nil {
glog.Warning(errors.Wrap(err, "Unable to get workers from kubernetes").Error())
continue
}
redisWorkers, err := getWorkersFromRedis(redisClient)
if err != nil {
glog.Warning(errors.Wrap(err, "Unable to get workers from redis").Error())
continue
}
deadRedisWorkers := redisWorkersNotInKubernetes(redisWorkers, kubernetesWorkers)
glog.V(2).Infof("Found %d kubernetes workers", len(kubernetesWorkers))
glog.V(2).Info(kubernetesWorkers)
glog.V(2).Infof("Found %d redis workers", len(redisWorkers))
glog.V(2).Info(redisWorkers)
glog.V(2).Infof("Found %d dead redis workers", len(deadRedisWorkers))
glog.V(2).Info(deadRedisWorkers)
for _, redisWorker := range deadRedisWorkers {
if err := removeDeadRedisWorker(redisClient, redisWorker); err != nil {
glog.Warning(errors.Wrap(err, fmt.Sprintf("Unable to delete %s", redisWorker)).Error())
}
}
failedResqueJobs, err := getDirtyExitFailedJobsFromRedis(redisClient)
if err != nil {
glog.Warning(errors.Wrap(err, "Unable to get failed jobs from redis").Error())
continue
}
glog.V(2).Infof("Found %d failed resque jobs", len(failedResqueJobs))
glog.V(2).Info(failedResqueJobs)
for _, failedResqueJob := range failedResqueJobs {
if err := removeFailedResqueJob(redisClient, failedResqueJob); err != nil {
glog.Warning(errors.Wrap(err, "Unable to retry failed resque job").Error())
}
}
glog.V(1).Infof("finished cleanup at %v...", time.Now())
}
}
// In order to meet interface criteria for LeaderElectionConfig we need to
// take stop channell as an argument. However, since we are committing a suicide
// after loosing mastership we can safely ignore it.
func run(_ <-chan struct{}) {
kubeClient := createKubeClient()
predicateChecker, err := simulator.NewPredicateChecker(kubeClient)
if err != nil {
glog.Fatalf("Failed to create predicate checker: %v", err)
}
unschedulablePodLister := kube_util.NewUnschedulablePodLister(kubeClient, kube_api.NamespaceAll)
scheduledPodLister := kube_util.NewScheduledPodLister(kubeClient)
nodeLister := kube_util.NewNodeLister(kubeClient)
lastScaleUpTime := time.Now()
lastScaleDownFailedTrial := time.Now()
unneededNodes := make(map[string]time.Time)
podLocationHints := make(map[string]string)
usageTracker := simulator.NewUsageTracker()
recorder := createEventRecorder(kubeClient)
var cloudProvider cloudprovider.CloudProvider
if *cloudProviderFlag == "gce" {
// GCE Manager
var gceManager *gce.GceManager
var gceError error
if *cloudConfig != "" {
config, fileErr := os.Open(*cloudConfig)
if fileErr != nil {
glog.Fatalf("Couldn't open cloud provider configuration %s: %#v", *cloudConfig, err)
}
defer config.Close()
gceManager, gceError = gce.CreateGceManager(config)
} else {
gceManager, gceError = gce.CreateGceManager(nil)
}
if gceError != nil {
glog.Fatalf("Failed to create GCE Manager: %v", err)
}
cloudProvider, err = gce.BuildGceCloudProvider(gceManager, nodeGroupsFlag)
if err != nil {
glog.Fatalf("Failed to create GCE cloud provider: %v", err)
}
}
if *cloudProviderFlag == "aws" {
var awsManager *aws.AwsManager
var awsError error
if *cloudConfig != "" {
config, fileErr := os.Open(*cloudConfig)
if fileErr != nil {
glog.Fatalf("Couldn't open cloud provider configuration %s: %#v", *cloudConfig, err)
}
defer config.Close()
awsManager, awsError = aws.CreateAwsManager(config)
} else {
awsManager, awsError = aws.CreateAwsManager(nil)
}
if awsError != nil {
glog.Fatalf("Failed to create AWS Manager: %v", err)
}
cloudProvider, err = aws.BuildAwsCloudProvider(awsManager, nodeGroupsFlag)
if err != nil {
glog.Fatalf("Failed to create AWS cloud provider: %v", err)
}
}
for {
select {
case <-time.After(*scanInterval):
{
loopStart := time.Now()
updateLastTime("main")
nodes, err := nodeLister.List()
if err != nil {
glog.Errorf("Failed to list nodes: %v", err)
continue
}
if len(nodes) == 0 {
glog.Errorf("No nodes in the cluster")
continue
}
if err := CheckGroupsAndNodes(nodes, cloudProvider); err != nil {
glog.Warningf("Cluster is not ready for autoscaling: %v", err)
continue
}
allUnschedulablePods, err := unschedulablePodLister.List()
if err != nil {
glog.Errorf("Failed to list unscheduled pods: %v", err)
continue
}
allScheduled, err := scheduledPodLister.List()
if err != nil {
glog.Errorf("Failed to list scheduled pods: %v", err)
continue
}
// We need to reset all pods that have been marked as unschedulable not after
// the newest node became available for the scheduler.
allNodesAvailableTime := GetAllNodesAvailableTime(nodes)
podsToReset, unschedulablePodsToHelp := SlicePodsByPodScheduledTime(allUnschedulablePods, allNodesAvailableTime)
ResetPodScheduledCondition(kubeClient, podsToReset)
// We need to check whether pods marked as unschedulable are actually unschedulable.
// This should prevent from adding unnecessary nodes. Example of such situation:
// - CA and Scheduler has slightly different configuration
// - Scheduler can't schedule a pod and marks it as unschedulable
// - CA added a node which should help the pod
// - Scheduler doesn't schedule the pod on the new node
// because according to it logic it doesn't fit there
// - CA see the pod is still unschedulable, so it adds another node to help it
//
// With the check enabled the last point won't happen because CA will ignore a pod
// which is supposed to schedule on an existing node.
//
// Without below check cluster might be unnecessary scaled up to the max allowed size
// in the describe situation.
schedulablePodsPresent := false
if *verifyUnschedulablePods {
newUnschedulablePodsToHelp := FilterOutSchedulable(unschedulablePodsToHelp, nodes, allScheduled, predicateChecker)
if len(newUnschedulablePodsToHelp) != len(unschedulablePodsToHelp) {
glog.V(2).Info("Schedulable pods present")
schedulablePodsPresent = true
}
unschedulablePodsToHelp = newUnschedulablePodsToHelp
}
if len(unschedulablePodsToHelp) == 0 {
glog.V(1).Info("No unschedulable pods")
} else if *maxNodesTotal > 0 && len(nodes) >= *maxNodesTotal {
glog.V(1).Info("Max total nodes in cluster reached")
} else {
scaleUpStart := time.Now()
updateLastTime("scaleup")
scaledUp, err := ScaleUp(unschedulablePodsToHelp, nodes, cloudProvider, kubeClient, predicateChecker, recorder,
*maxNodesTotal)
updateDuration("scaleup", scaleUpStart)
if err != nil {
glog.Errorf("Failed to scale up: %v", err)
continue
} else {
if scaledUp {
lastScaleUpTime = time.Now()
// No scale down in this iteration.
continue
}
}
}
if *scaleDownEnabled {
unneededStart := time.Now()
// In dry run only utilization is updated
calculateUnneededOnly := lastScaleUpTime.Add(*scaleDownDelay).After(time.Now()) ||
lastScaleDownFailedTrial.Add(*scaleDownTrialInterval).After(time.Now()) ||
schedulablePodsPresent
glog.V(4).Infof("Scale down status: unneededOnly=%v lastScaleUpTime=%s "+
"lastScaleDownFailedTrail=%s schedulablePodsPresent=%v", calculateUnneededOnly,
lastScaleUpTime, lastScaleDownFailedTrial, schedulablePodsPresent)
updateLastTime("findUnneeded")
glog.V(4).Infof("Calculating unneded nodes")
usageTracker.CleanUp(time.Now().Add(-(*scaleDownUnneededTime)))
unneededNodes, podLocationHints = FindUnneededNodes(
nodes,
unneededNodes,
*scaleDownUtilizationThreshold,
allScheduled,
predicateChecker,
podLocationHints,
usageTracker, time.Now())
updateDuration("findUnneeded", unneededStart)
for key, val := range unneededNodes {
if glog.V(4) {
glog.V(4).Infof("%s is unneeded since %s duration %s", key, val.String(), time.Now().Sub(val).String())
}
}
if !calculateUnneededOnly {
glog.V(4).Infof("Starting scale down")
scaleDownStart := time.Now()
updateLastTime("scaledown")
result, err := ScaleDown(
nodes,
unneededNodes,
*scaleDownUnneededTime,
allScheduled,
cloudProvider,
kubeClient,
predicateChecker,
podLocationHints,
usageTracker)
updateDuration("scaledown", scaleDownStart)
// TODO: revisit result handling
if err != nil {
glog.Errorf("Failed to scale down: %v", err)
} else {
if result == ScaleDownError || result == ScaleDownNoNodeDeleted {
lastScaleDownFailedTrial = time.Now()
}
}
}
}
updateDuration("main", loopStart)
}
}
}
}