我有一个Google Kubernetes Engine集群，该集群直到最近一直很高兴地从Google Container Registry存储桶中提取私有容器映像。我没有做任何更改，但是现在当我更新Kubernetes部署时，它无法启动新的Pod，并且发生以下事件：
Normal Pulling 14s kubelet, <node-id> pulling image "gcr.io/cloudsql-docker/gce-proxy:latest"
Normal Pulling 14s kubelet, <node-id> pulling image "gcr.io/<project-id>/backend:62d634e"
Warning Failed 14s kubelet, <node-id> Failed to pull image "gcr.io/<project-id>/backend:62d634e": rpc error: code = Unknown desc = unauthorized: authentication required
Warning Failed 14s kubelet, <node-id> Error: ErrImagePull
Normal Pulled 13s kubelet, <node-id> Successfully pulled image "gcr.io/cloudsql-docker/gce-proxy:latest"
Normal Created 13s kubelet, <node-id> Created container
Normal Started 13s kubelet, <node-id> Started container
Normal BackOff 11s (x2 over 12s) kubelet, <node-id> Back-off …