源码为k8s v1.3.0稳定版本

(7) updatepod起的协程在何时退出

再kubelet中有两个过程涉及到两个处理函数

 

一个是： HandlePodRemoves-》deletePod-》kl.podWorkers.ForgetWorker(pod.UID)-》removeWorker

 

另外一个是： HandlePodCleanups -》ForgetNonExistingPodWorkers-》 然后循环遍历所有的pod -》 removeWorker

(8)mainloop中的处理

step1：接收updatepod函数发送过来的事件消息，不断的进行处理

 

step2:  比较最后同步时间

 

step3: 进行同步处理，同步处理的函数为kubelet中的syncPod函数

 

k8s.io\kubernetes\pkg\kubelet\kubelet.go:1703

 

step4：更新最后同步的时间

 

step5：执行完成的回调函数：OnCompleteFunc

 

step6：wrapUp中设置一个时间间隔(待确定具体工作流程)

(9)   Kubelet中，syncPod的处理

从pod管理往下走，pod管理最后进入到kubelet中的 syncPod，在 sycnPod中，会进入到下一级的sycnPod

result := kl.containerRuntime.SyncPod(pod, apiPodStatus, podStatus, pullSecrets, kl.backOff)

然后在Cache 中进行状态同步

kl.reasonCache.Update(pod.UID, result)

// syncPod is the transaction script for the sync of a single pod.
//
// Arguments:
//
// pod - the pod to sync
// mirrorPod - the mirror pod for the pod to sync, if it is a static pod
// podStatus - the current status (TODO: always from the status manager?)
// updateType - the type of update (ADD, UPDATE, REMOVE, RECONCILE, DELETE)
//
// The workflow is:
// * If the pod is being created, record pod worker start latency
// * Call generateAPIPodStatus to prepare an api.PodStatus for the pod
// * If the pod is being seen as running for the first time, record pod
//   start latency
// * Update the status of the pod in the status manager
// * Kill the pod if it should not be running
// * Create a mirror pod if the pod is a static pod, and does not
//   already have a mirror pod
// * Create the data directories for the pod if they do not exist
// * Wait for volumes to attach/mount
// * Fetch the pull secrets for the pod
// * Call the container runtime's SyncPod callback
// * Update the traffic shaping for the pod's ingress and egress limits
//
// If any step if this workflow errors, the error is returned, and is repeated
// on the next syncPod call.
func (kl *Kubelet) syncPod(o syncPodOptions) error {
       // pull out the required options
       pod := o.pod
       mirrorPod := o.mirrorPod
       podStatus := o.podStatus
       updateType := o.updateType

       // if we want to kill a pod, do it now!
       if updateType == kubetypes.SyncPodKill {
              killPodOptions := o.killPodOptions
              if killPodOptions == nil || killPodOptions.PodStatusFunc == nil {
                     return fmt.Errorf("kill pod options are required if update type is kill")
              }
              apiPodStatus := killPodOptions.PodStatusFunc(pod, podStatus)
              kl.statusManager.SetPodStatus(pod, apiPodStatus)
              // we kill the pod with the specified grace period since this is a termination
              if err := kl.killPod(pod, nil, podStatus, killPodOptions.PodTerminationGracePeriodSecondsOverride); err != nil {
                     // there was an error killing the pod, so we return that error directly
                     utilruntime.HandleError(err)
                     return err
              }
              return nil
       }

       // Latency measurements for the main workflow are relative to the
       // (first time the pod was seen by the API server.
       var firstSeenTime time.Time
       if firstSeenTimeStr, ok := pod.Annotations[kubetypes.ConfigFirstSeenAnnotationKey]; ok {
              firstSeenTime = kubetypes.ConvertToTimestamp(firstSeenTimeStr).Get()
       }

       // Record pod worker start latency if being created
       // TODO: make pod workers record their own latencies
       if updateType == kubetypes.SyncPodCreate {
              if !firstSeenTime.IsZero() {
                     // This is the first time we are syncing the pod. Record the latency
                     // since kubelet first saw the pod if firstSeenTime is set.
                     metrics.PodWorkerStartLatency.Observe(metrics.SinceInMicroseconds(firstSeenTime))
              } else {
                     glog.V(3).Infof("First seen time not recorded for pod %q", pod.UID)
              }
       }

       // Generate final API pod status with pod and status manager status
       apiPodStatus := kl.generateAPIPodStatus(pod, podStatus)
       // The pod IP may be changed in generateAPIPodStatus if the pod is using host network. (See #24576)
       // TODO(random-liu): After writing pod spec into container labels, check whether pod is using host network, and
       // set pod IP to hostIP directly in runtime.GetPodStatus
       podStatus.IP = apiPodStatus.PodIP

       // Record the time it takes for the pod to become running.
       existingStatus, ok := kl.statusManager.GetPodStatus(pod.UID)
       if !ok || existingStatus.Phase == api.PodPending && apiPodStatus.Phase == api.PodRunning &&
              !firstSeenTime.IsZero() {
              metrics.PodStartLatency.Observe(metrics.SinceInMicroseconds(firstSeenTime))
       }

       // Update status in the status manager
       kl.statusManager.SetPodStatus(pod, apiPodStatus)

       // Kill pod if it should not be running
       if errOuter := canRunPod(pod); errOuter != nil || pod.DeletionTimestamp != nil || apiPodStatus.Phase == api.PodFailed {
              if errInner := kl.killPod(pod, nil, podStatus, nil); errInner != nil {
                     errOuter = fmt.Errorf("error killing pod: %v", errInner)
                     utilruntime.HandleError(errOuter)
              }
              // there was no error killing the pod, but the pod cannot be run, so we return that err (if any)
              return errOuter
       }

       // Create Mirror Pod for Static Pod if it doesn't already exist
       if kubepod.IsStaticPod(pod) {
              podFullName := kubecontainer.GetPodFullName(pod)
              deleted := false
              if mirrorPod != nil {
                     if mirrorPod.DeletionTimestamp != nil || !kl.podManager.IsMirrorPodOf(mirrorPod, pod) {
                            // The mirror pod is semantically different from the static pod. Remove
                            // it. The mirror pod will get recreated later.
                            glog.Errorf("Deleting mirror pod %q because it is outdated", format.Pod(mirrorPod))
                            if err := kl.podManager.DeleteMirrorPod(podFullName); err != nil {
                                   glog.Errorf("Failed deleting mirror pod %q: %v", format.Pod(mirrorPod), err)
                            } else {
                                   deleted = true
                            }
                     }
              }
              if mirrorPod == nil || deleted {
                     glog.V(3).Infof("Creating a mirror pod for static pod %q", format.Pod(pod))
                     if err := kl.podManager.CreateMirrorPod(pod); err != nil {
                            glog.Errorf("Failed creating a mirror pod for %q: %v", format.Pod(pod), err)
                     }
              }
       }

       // Make data directories for the pod
       if err := kl.makePodDataDirs(pod); err != nil {
              glog.Errorf("Unable to make pod data directories for pod %q: %v", format.Pod(pod), err)
              return err
       }

       // Wait for volumes to attach/mount
       defaultedPod, _, err := kl.defaultPodLimitsForDownwardApi(pod, nil)
       if err != nil {
              return err
       }
       if err := kl.volumeManager.WaitForAttachAndMount(defaultedPod); err != nil {
              kl.recorder.Eventf(pod, api.EventTypeWarning, kubecontainer.FailedMountVolume, "Unable to mount volumes for pod %q: %v", format.Pod(pod), err)
              glog.Errorf("Unable to mount volumes for pod %q: %v; skipping pod", format.Pod(pod), err)
              return err
       }

       // Fetch the pull secrets for the pod
       pullSecrets, err := kl.getPullSecretsForPod(pod)
       if err != nil {
              glog.Errorf("Unable to get pull secrets for pod %q: %v", format.Pod(pod), err)
              return err
       }

       // Call the container runtime's SyncPod callback
       result := kl.containerRuntime.SyncPod(pod, apiPodStatus, podStatus, pullSecrets, kl.backOff)
       kl.reasonCache.Update(pod.UID, result)
       if err = result.Error(); err != nil {
              return err
       }

       // early successful exit if pod is not bandwidth-constrained
       if !kl.shapingEnabled() {
              return nil
       }

       // Update the traffic shaping for the pod's ingress and egress limits
       ingress, egress, err := bandwidth.ExtractPodBandwidthResources(pod.Annotations)
       if err != nil {
              return err
       }
       if egress != nil || ingress != nil {
              if podUsesHostNetwork(pod) {
                     kl.recorder.Event(pod, api.EventTypeWarning, kubecontainer.HostNetworkNotSupported, "Bandwidth shaping is not currently supported on the host network")
              } else if kl.shaper != nil {
                     if len(apiPodStatus.PodIP) > 0 {
                            err = kl.shaper.ReconcileCIDR(fmt.Sprintf("%s/32", apiPodStatus.PodIP), egress, ingress)
                     }
              } else {
                     kl.recorder.Event(pod, api.EventTypeWarning, kubecontainer.UndefinedShaper, "Pod requests bandwidth shaping, but the shaper is undefined")
              }
       }

       return nil
}

step1:  generateAPIPodStatus处理

step2:   GetPodStatus and SetPodStatus

step3: canRunPod判断


step4： IsStaticPod处理


step5： makePodDataDirs处理


step6：// Wait for volumes to attach/mount
defaultPodLimitsForDownwardApi
WaitForAttachAndMount


step7：// Fetch the pull secrets for the pod
getPullSecretsForPod


step8：kl.containerRuntime.SyncPod
kl.reasonCache.Update(pod.UID, result)


step9：kl.shapingEnabled()


step10：// Update the traffic shaping for the pod's ingress and egress limits
bandwidth.ExtractPodBandwidthResources