Cluster update known issues

This section lists the cluster update known issues with workarounds for the Mirantis OpenStack for Kubernetes release 21.5.

[4288] Cluster update failure with kubelet being stuck

A MOS cluster may fail to update to the latest Cluster release with kubelet being stuck and reporting authorization errors.

The cluster is affected by the issue if you see the Failed to make webhook authorizer request: context canceled error in the kubelet logs:

docker logs ucp-kubelet --since 5m 2>&1 | grep 'Failed to make webhook authorizer request: context canceled'

As a workaround, restart the ucp-kubelet container on the affected node(s):

ctr -n com.docker.ucp snapshot rm ucp-kubelet
docker rm -f ucp-kubelet


Ignore failures in the output of the first command, if any.

[16987] Cluster update fails at Ceph CSI pod eviction

Fixed in MOS 22.2

An update of a MOS cluster may fail with the ceph csi-driver is not evacuated yet, waiting… error during the Ceph CSI pod eviction.


  1. Scale the affected StatefulSet of the pod that fails to init down to 0 replicas. If it is the DaemonSet such as nova-compute, it must not be scheduled on the affected node.

  2. On every csi-rbdplugin pod, search for stuck csi-vol:

    rbd device list | grep <csi-vol-uuid>
  3. Unmap the affected csi-vol:

    rbd unmap -o force /dev/rbd<i>
  4. Delete volumeattachment of the affected pod:

    kubectl get volumeattachments | grep <csi-vol-uuid>
    kubectl delete volumeattacmhent <id>
  5. Scale the affected StatefulSet back to the original number of replicas or until its state is Running. If it is a DaemonSet, run the pod on the affected node again.