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rkt: return non error if the pod doesn't exist in GetPodStatus().

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Previously, GetPodStatus() will return error if the pod is never
created. However we've never seen the sync loop fail because in the
beginning of the loop, if the pod is not found, it will be created.

This works fine except the pod that keeps crashing. Because the above
logic will keep restarting the pod as if it's never created.

This PR fixes the bug.
This commit is contained in:
Yifan Gu 2015-09-28 19:14:18 -07:00
parent 095fec84e9
commit 4309cafff1
1 changed files with 17 additions and 8 deletions
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25
pkg/kubelet/rkt/rkt.go
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@ -820,16 +820,26 @@ func (r *runtime) KillPod(pod *api.Pod, runningPod kubecontainer.Pod) error {
// getPodStatus reads the service file and invokes 'rkt status $UUID' to get the
// pod's status.
func (r *runtime) getPodStatus(serviceName string) (*api.PodStatus, error) {
var status api.PodStatus
// TODO(yifan): Get rkt uuid from the service file name.
pod, rktInfo, err := r.readServiceFile(serviceName)
if err != nil {
if err != nil && !os.IsNotExist(err) {
return nil, err
}
if os.IsNotExist(err) {
// Pod does not exit, means it's not been created yet,
// return empty status for now.
// TODO(yifan): Maybe inspect the image and return waiting status.
return &status, nil
}
podInfo, err := r.getPodInfo(rktInfo.uuid)
if err != nil {
return nil, err
}
status := makePodStatus(pod, podInfo, rktInfo)
status = makePodStatus(pod, podInfo, rktInfo)
return &status, nil
}
@ -979,10 +989,6 @@ func (r *runtime) IsImagePresent(image kubecontainer.ImageSpec) (bool, error) {
// SyncPod syncs the running pod to match the specified desired pod.
func (r *runtime) SyncPod(pod *api.Pod, runningPod kubecontainer.Pod, podStatus api.PodStatus, pullSecrets []api.Secret, backOff *util.Backoff) error {
podFullName := kubeletUtil.FormatPodName(pod)
if len(runningPod.Containers) == 0 {
glog.V(4).Infof("Pod %q is not running, will start it", podFullName)
return r.RunPod(pod, pullSecrets)
}
// Add references to all containers.
unidentifiedContainers := make(map[types.UID]*kubecontainer.Container)
@ -1036,8 +1042,11 @@ func (r *runtime) SyncPod(pod *api.Pod, runningPod kubecontainer.Pod, podStatus
}
if restartPod {
if err := r.KillPod(pod, runningPod); err != nil {
return err
// Kill the pod only if the pod is actually running.
if len(runningPod.Containers) > 0 {
if err := r.KillPod(pod, runningPod); err != nil {
return err
}
}
if err := r.RunPod(pod, pullSecrets); err != nil {
return err