已经尝试pull几天了，一直是失败，是否单独的离线镜像tar包使用？谢谢！
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 13s default-scheduler Successfully assigned kubesphere-logging-system/elasticsearch-logging-kibana-5b7fc7c547-hrtkb to localhost.localdomain
Normal Pulling 12s kubelet, localhost.localdomain Pulling image "dockerhub.qingcloud.com/kibana/kibana-oss:6.7.0"
Warning Failed 11s kubelet, localhost.localdomain Failed to pull image "dockerhub.qingcloud.com/kibana/kibana-oss:6.7.0": rpc error: code = Unknown desc = Error response from daemon: Get https://dockerhub.qingcloud.com/v2/kibana/kibana-oss/manifests/6.7.0: unauthorized: authentication required
Warning Failed 11s kubelet, localhost.localdomain Error: ErrImagePull
Normal BackOff 10s (x2 over 11s) kubelet, localhost.localdomain Back-off pulling image "dockerhub.qingcloud.com/kibana/kibana-oss:6.7.0"
Warning Failed 10s (x2 over 11s) kubelet, localhost.localdomain Error: ImagePullBackOff
