Mark NodeNotReady for docker version below 1.6.2

pkg/kubelet/container/runtime.go

@@ -72,6 +72,9 @@ type ImageSpec struct {
 // by a container runtime.
 // Thread safety is required from implementations of this interface.
 type Runtime interface {
+	// Type returns the type of the container runtime.
+	Type() string
+
 	// Version returns the version information of the container runtime.
 	Version() (Version, error)
 	// GetPods returns a list containers group by pods. The boolean parameter