运行kubelet时出错，节点没有准备好

我正在运行使用docker的kuberentes，而且我可以运行一个pod，并在一段时间后进入运行阶段。

kubelet日志显示这个：

E1027 02:52:53.222558 21724 kubelet.go:2246] Error updating node status, will retry: node "127.0.0.1" cannot be updated: the object has been modified; please apply your changes to the latest version and try again I1027 02:53:06.230423 21724 kubelet.go:2255] Recording NodeReady event message for node 127.0.0.1 

然后节点没有准备好。 然后，我必须重新启动kubeblet，一切运行良好，然后再次kubelet过期。 任何想法为什么我有这个问题？ 为什么说kubelet节点没有准备好一遍又一遍？

TIA。

更新：也有这些types的日志：

 E1027 03:23:00.659237 17690 volumes.go:152] Could not read directory /var/lib/kubelet/pods/34aa25b8-763b-11e5-9d79-5252c7a37a40/volumes: open /var/lib/kubelet/pods/34aa25b8-763b-11e5-9d79-5252c7a37a40/volumes: no such file or directory E1027 03:23:00.659359 17690 volumes.go:152] Could not read directory /var/lib/kubelet/pods/91cc7728-763b-11e5-9d79-5252c7a37a40/volumes: open /var/lib/kubelet/pods/91cc7728-763b-11e5-9d79-5252c7a37a40/volumes: no such file or directory E1027 03:23:00.659419 17690 volumes.go:152] Could not read directory /var/lib/kubelet/pods/ebea235e-765e-11e5-b350-525400698cc6/volumes: open /var/lib/kubelet/pods/ebea235e-765e-11e5-b350-525400698cc6/volumes: no such file or directory E1027 03:23:00.659597 17690 volumes.go:152] Could not read directory /var/lib/kubelet/pods/34aa25b8-763b-11e5-9d79-5252c7a37a40/volumes: open /var/lib/kubelet/pods/34aa25b8-763b-11e5-9d79-5252c7a37a40/volumes: no such file or directory E1027 03:23:00.660461 17690 volumes.go:152] Could not read directory /var/lib/kubelet/pods/91cc7728-763b-11e5-9d79-5252c7a37a40/volumes: open /var/lib/kubelet/pods/91cc7728-763b-11e5-9d79-5252c7a37a40/volumes: no such file or directory E1027 03:23:00.660906 17690 volumes.go:152] Could not read directory /var/lib/kubelet/pods/ebea235e-765e-11e5-b350-525400698cc6/volumes: open /var/lib/kubelet/pods/ebea235e-765e-11e5-b350-525400698cc6/volumes: no such file or directory