Known issues

This section lists known issues with workarounds for the Mirantis Container Cloud release 2.4.0 including the Cluster release 5.11.0 and 6.10.0.

Note

This section also outlines still valid known issues from previous Container Cloud releases.


AWS

[8013] Managed cluster deployment requiring PVs may fail

Fixed in the Cluster release 7.0.0

Note

The issue below affects only the Kubernetes 1.18 deployments. Moving forward, the workaround for this issue will be moved from Release Notes to Operations Guide: Troubleshooting.

On a management cluster with multiple AWS-based managed clusters, some clusters fail to complete the deployments that require persistent volumes (PVs), for example, Elasticsearch. Some of the affected pods get stuck in the Pending state with the pod has unbound immediate PersistentVolumeClaims and node(s) had volume node affinity conflict errors.

Warning

The workaround below applies to HA deployments where data can be rebuilt from replicas. If you have a non-HA deployment, back up any existing data before proceeding, since all data will be lost while applying the workaround.

Workaround:

  1. Obtain the persistent volume claims related to the storage mounts of the affected pods:

    kubectl get pod/<pod_name1> pod/<pod_name2> \
    -o jsonpath='{.spec.volumes[?(@.persistentVolumeClaim)].persistentVolumeClaim.claimName}'
    

    Note

    In the command above and in the subsequent steps, substitute the parameters enclosed in angle brackets with the corresponding values.

  2. Delete the affected Pods and PersistentVolumeClaims to reschedule them: For example, for StackLight:

    kubectl -n stacklight delete \
    
      pod/<pod_name1> pod/<pod_name2> ...
      pvc/<pvc_name2> pvc/<pvc_name2> ...
    


Bare metal

[9875] Full preflight fails with a timeout waiting for BareMetalHost

Fixed in Container Cloud 2.6.0

If you run bootstrap.sh preflight with KAAS_BM_FULL_PREFLIGHT=true, the script fails with the following message:

failed to create BareMetal objects: failed to wait for objects of kinds BareMetalHost
to become available: timed out waiting for the condition

As a workaround, unset full preflight using unset KAAS_BM_FULL_PREFLIGHT to run fast preflight instead.

[11102] Keepalived does not detect the loss of VIP deleted by netplan

Fixed in Container Cloud 2.5.0

This issue may occur on the baremetal-based managed clusters that are created using L2 templates when network configuration is changed by the user or when Container Cloud is updated from version 2.3.0 to 2.4.0.

Due to the community issue, Keepalived 1.3.9 does not detect and restore a VIP of a managed cluster node after running the netplan apply command. The command is used to apply network configuration changes.

As a result, the Kubernetes API on the affected managed clusters becomes inaccessible.

As a workaround, log in to all nodes of the affected managed clusters and restart Keepalived using systemctl restart keepalived.

[6988] LVM fails to deploy if the volume group name already exists

Fixed in Container Cloud 2.5.0

During a management or managed cluster deployment, LVM cannot be deployed on a new disk if an old volume group with the same name already exists on the target hardware node but on the different disk.

Workaround:

In the bare metal host profile specific to your hardware configuration, add the wipe: true parameter to the device that fails to be deployed. For the procedure details, see Operations Guide: Create a custom host profile.

[7655] Wrong status for an incorrectly configured L2 template

Fixed in 2.11.0

If an L2 template is configured incorrectly, a bare metal cluster is deployed successfully but with the runtime errors in the IpamHost object.

Workaround:

If you suspect that the machine is not working properly because of incorrect network configuration, verify the status of the corresponding IpamHost object. Inspect the l2RenderResult and ipAllocationResult object fields for error messages.


[8560] Manual deletion of BareMetalHost leads to its silent removal

Fixed in Container Cloud 2.5.0

If BareMetalHost is manually removed from a managed cluster, it is silently removed without a power-off and deprovision that leads to a managed cluster failures.

Workaround:

Do not manually delete a BareMetalHost that has the Provisioned status.


Storage

[10060] Ceph OSD node removal fails

Fixed in Container Cloud 2.7.0

A Ceph node removal is not being triggered properly after updating the KaasCephCluster custom resource (CR). Both management and managed clusters are affected.

Workaround:

  1. Remove the parameters for a Ceph OSD from the KaasCephCluster CR as described in Operations Guide: Add, remove, or reconfigure Ceph nodes.

  2. Obtain the IDs of the osd and mon services that are located on the old node:

    1. Obtain the UID of the affected machine:

      kubectl get machine <CephOSDNodeName> -n <ManagedClusterProjectName> -o jsonpath='{.metadata.annotations.kaas\.mirantis\.com\/uid}'
      
    2. Export kubeconfig of your managed cluster. For example:

      export KUBECONFIG=~/Downloads/kubeconfig-test-cluster.yml
      
    3. Identify the pods IDs that run the osd and mon services:

      kubectl get pods -o wide -n rook-ceph | grep <affectedMachineUID> | grep -E "mon|osd"
      

      Example of the system response extract:

      rook-ceph-mon-c-7bbc5d757d-5bpws                              1/1  Running    1  6h1m
      rook-ceph-osd-2-58775d5568-5lklw                              1/1  Running    4  44h
      rook-ceph-osd-prepare-705ae6c647cfdac928c63b63e2e2e647-qn4m9  0/1  Completed  0  94s
      

      The pods IDs include the osd or mon services IDs. In the example system response above, the osd ID is 2 and the mon ID is c.

  3. Delete the deployments of the osd and mon services obtained in the previous step:

    kubectl delete deployment rook-ceph-osd(mon)-<ID> -n rook-ceph
    

    For example:

    kubectl delete deployment rook-ceph-mon-c -n rook-ceph
    kubectl delete deployment rook-ceph-osd-2 -n rook-ceph
    
  4. Log in to the ceph-tools pod:

    kubectl -n rook-ceph exec -it $(kubectl -n rook-ceph get pod -l "app=rook-ceph-tools" -o jsonpath='{.items[0].metadata.name}') bash
    
  5. Rebalance the Ceph OSDs:

    ceph osd out osd(s).ID
    

    Wait for the rebalance to complete.

  6. Rebalance the Ceph data:

    ceph osd purge osd(s).ID
    

    Wait for the Ceph data to rebalance.

  7. Remove the old node from the Ceph OSD tree:

    ceph osd crush rm <NodeName>
    
  8. If the removed node contained mon services, remove them:

    ceph mon rm <monID>
    

[9928] Ceph rebalance during a managed cluster update

Fixed in Container Cloud 2.5.0

During a managed cluster update, Ceph rebalance leading to data loss may occur.

Workaround:

  1. Before updating a managed cluster:

    1. Log in to the ceph-tools pod:

      kubectl -n rook-ceph exec -it <ceph-tools-pod-name> bash
      
    2. Set the noout flag:

      ceph osd set noout
      
  2. Update a managed cluster.

  3. After updating a managed cluster:

    1. Log in to the ceph-tools pod:

      kubectl -n rook-ceph exec -it <ceph-tools-pod-name> bash
      
    2. Unset the noout flag:

      ceph osd unset noout
      

[7073] Cannot automatically remove a Ceph node

When removing a worker node, it is not possible to automatically remove a Ceph node. The workaround is to manually remove the Ceph node from the Ceph cluster as described in Operations Guide: Add, remove, or reconfigure Ceph nodes before removing the worker node from your deployment.

Note

Moving forward, the workaround for this issue will be moved from Release Notes to Operations Guide: Troubleshoot Ceph.

[10050] Ceph OSD pod is in the CrashLoopBackOff state after disk replacement

Fixed in 2.11.0

If you use a custom BareMetalHostProfile, after disk replacement on a Ceph OSD, the Ceph OSD pod switches to the CrashLoopBackOff state due to the Ceph OSD authorization key failing to be created properly.

Workaround:

  1. Export kubeconfig of your managed cluster. For example:

    export KUBECONFIG=~/Downloads/kubeconfig-test-cluster.yml
    
  2. Log in to the ceph-tools pod:

    kubectl -n rook-ceph exec -it $(kubectl -n rook-ceph get pod -l "app=rook-ceph-tools" -o jsonpath='{.items[0].metadata.name}') bash
    
  3. Delete the authorization key for the failed Ceph OSD:

    ceph auth del osd.<ID>
    
  4. SSH to the node on which the Ceph OSD cannot be created.

  5. Clean up the disk that will be a base for the failed Ceph OSD. For details, see official Rook documentation.

    Note

    Ignore failures of the sgdisk --zap-all $DISK and blkdiscard $DISK commands if any.

  6. On the managed cluster, restart the Rook operator:

    kubectl -n rook-ceph delete pod -l app=rook-ceph-operator
    


LCM

[10029] Authentication fails with the 401 Unauthorized error

Authentication may not work on some controller nodes after a managed cluster creation. As a result, the Kubernetes API operations with the managed cluster kubeconfig fail with Response Status: 401 Unauthorized.

As a workaround, manually restart the ucp-controller and ucp-auth Docker services on the affected node.

Note

Moving forward, the workaround for this issue will be moved from Release Notes to Operations Guide: Troubleshooting.

[6066] Helm releases get stuck in FAILED or UNKNOWN state

During a management, regional, or managed cluster deployment, Helm releases may get stuck in the FAILED or UNKNOWN state although the corresponding machines statuses are Ready in the Container Cloud web UI. For example, if the StackLight Helm release fails, the links to its endpoints are grayed out in the web UI. In the cluster status, providerStatus.helm.ready and providerStatus.helm.releaseStatuses.<releaseName>.success are false.

HelmBundle cannot recover from such states and requires manual actions. The workaround below describes the recovery steps for the stacklight release that got stuck during a cluster deployment. Use this procedure as an example for other Helm releases as required.

Workaround:

  1. Verify the failed release has the UNKNOWN or FAILED status in the HelmBundle object:

    kubectl --kubeconfig <regionalClusterKubeconfigPath> get helmbundle <clusterName> -n <clusterProjectName> -o=jsonpath={.status.releaseStatuses.stacklight}
    
    In the command above and in the steps below, replace the parameters
    enclosed in angle brackets with the corresponding values of your cluster.
    

    Example of system response:

    stacklight:
    attempt: 2
    chart: ""
    finishedAt: "2021-02-05T09:41:05Z"
    hash: e314df5061bd238ac5f060effdb55e5b47948a99460c02c2211ba7cb9aadd623
    message: '[{"occurrence":1,"lastOccurrenceDate":"2021-02-05 09:41:05","content":"error
      updating the release: rpc error: code = Unknown desc = customresourcedefinitions.apiextensions.k8s.io
      \"helmbundles.lcm.mirantis.com\" already exists"}]'
    notes: ""
    status: UNKNOWN
    success: false
    version: 0.1.2-mcp-398
    
  2. Log in to the helm-controller pod console:

    kubectl --kubeconfig <affectedClusterKubeconfigPath> exec -n kube-system -it helm-controller-0 sh -c tiller
    
  3. Remove the failed release. For example:

    ./helm --host=localhost:44134 delete stacklight
    

    If the version of the failed Helm release is v3:

    1. Download the Helm v3 binary. For details, see official Helm documentation.

    2. Remove the failed release:

      helm delete <failed-release-name>
      

    Once done, the release triggers for redeployment.



StackLight

[11001] Patroni pod fails to start

Fixed in Container Cloud 2.6.0

After the management cluster update, a Patroni pod may fail to start and remain in the CrashLoopBackOff status. Messages similar to the following ones may be present in Patroni logs:

Local timeline=4 lsn=0/A000000
master_timeline=6
master: history=1 0/1ADEB48       no recovery target specified
2       0/8044500       no recovery target specified
3       0/A0000A0       no recovery target specified
4       0/A1B6CB0       no recovery target specified
5       0/A2C0C80       no recovery target specified

As a workaround, reinitialize the affected pod with a new volume by deleting the pod itself and the associated PersistentVolumeClaim (PVC).

Workaround:

  1. Obtain the PVC of the affected pod:

    kubectl -n stacklight get "pod/${POD_NAME}" -o jsonpath='{.spec.volumes[?(@.name=="storage-volume")].persistentVolumeClaim.claimName}'
    
  2. Delete the affected pod and its PVC:

    kubectl -n stacklight delete "pod/${POD_NAME}" "pvc/${POD_PVC}"
    sleep 3  # wait for StatefulSet to reschedule the pod, but miss dependent PVC creation
    kubectl -n stacklight delete "pod/${POD_NAME}"
    

Management cluster update

[9899] Helm releases get stuck in PENDING_UPGRADE during cluster update

Helm releases may get stuck in the PENDING_UPGRADE status during a management or managed cluster upgrade. The HelmBundle controller cannot recover from this state and requires manual actions. The workaround below describes the recovery process for the openstack-operator release that stuck during a managed cluster update. Use it as an example for other Helm releases as required.

Workaround:

  1. Log in to the helm-controller pod console:

    kubectl exec -n kube-system -it helm-controller-0 sh -c tiller
    
  2. Identify the release that stuck in the PENDING_UPGRADE status. For example:

    ./helm --host=localhost:44134 history openstack-operator
    

    Example of system response:

    REVISION  UPDATED                   STATUS           CHART                      DESCRIPTION
    1         Tue Dec 15 12:30:41 2020  SUPERSEDED       openstack-operator-0.3.9   Install complete
    2         Tue Dec 15 12:32:05 2020  SUPERSEDED       openstack-operator-0.3.9   Upgrade complete
    3         Tue Dec 15 16:24:47 2020  PENDING_UPGRADE  openstack-operator-0.3.18  Preparing upgrade
    
  3. Roll back the failed release to the previous revision. For example:

    ./helm --host=localhost:44134 rollback openstack-operator 2
    

    If the version of the failed Helm release is v3:

    1. Download the Helm v3 binary. For details, see official Helm documentation.

    2. Roll back the failed release:

      helm rollback <failed-release-name>
      

    Once done, the release will be reconciled.



Container Cloud web UI

[249] A newly created project does not display in the Container Cloud web UI

A project that is newly created in the Container Cloud web UI does not display in the Projects list even after refreshing the page. The issue occurs due to the token missing the necessary role for the new project. As a workaround, relogin to the Container Cloud web UI.