Update notes

This section describes the specific actions you as a Cloud Operator need to complete to accurately plan and successfully perform your Mirantis OpenStack for Kubernetes (MOSK) cluster update to the version 24.1. Consider this information as a supplement to the generic update procedure published in Operations Guide: Update a MOSK cluster.


The MOSK cluster will obtain the newly implemented capabilities automatically with no significant impact on the update procedure.

Update impact and maintenance windows planning

The following table provides details on the update impact on a MOSK cluster.

Impact during update to MOSK 24.1

Updated component

Impact on cloud users

Impact on cloud workloads

OpenStack and Tungsten Fabric

  • ~1% of read operations on cloud API resources may fail

  • ~8% of create and update operations on cloud API resources may fail

Open vSwitch networking - interruption of the North-South connectivity, depending on the type of virtual routers used by a workload:

  • Distributed (DVR) routers - no interruption

  • Non-distributed routers, High Availability (HA) mode - interruption up to 1 minute, usually less than 5 seconds

  • Non-distributed routers, non-HA mode - interruption up to 10 minutes

Tungsten Fabric networking - no impact


~1% of read operations on object storage API may fail

IO performance degradation for Ceph-backed virtual storage devices

Host OS components

No impact

Instance network connectivity interruption up to 5 minutes

Host OS kernel

No impact

Restart of instances due to the hypervisor reboot 0


Host operating system needs to be rebooted for the kernel update to be applied. Configure live-migration of workloads to avoid the impact on the instances running on a host.

To properly plan the update maintenance window, use the following documentation:

Known issues during the update

Before updating the cluster, be sure to review the potential issues that may arise during the process and the recommended solutions to address them, as outlined in Update known issues.

If your are updating to MOSK 24.1 from the 23.2 series, make sure that you apply the workaround for [37545] Cloud public API becomes inaccessible during update.

Pre-update actions

Unblock cluster update by removing any pinned product artifacts

If any pinned product artifacts are present in the Cluster object of a management or managed cluster, the update will be blocked by the Admission Controller with the invalid HelmReleases configuration error until such artifacts are removed. The update process does not start and any changes in the Cluster object are blocked by the Admission Controller except the removal of fields with pinned product artifacts.

Therefore, verify that the following sections of the Cluster objects do not contain any image-related (tag, name, pullPolicy, repository) and global values inside Helm releases:

  • .spec.providerSpec.value.helmReleases

  • .spec.providerSpec.value.kaas.management.helmReleases

  • .spec.providerSpec.value.regionalHelmReleases

  • .spec.providerSpec.value.regional

For example, a cluster configuration that contains the following highlighted lines will be blocked until you remove them:

- name: kaas-ipam
                tag: base-focal-20230127092754
              exampleKey: exampleValue
- name: kaas-ipam
              anyKey: anyValue
                tag: base-focal-20230127092754
              exampleKey: exampleValue

The custom pinned product artifacts are inspected and blocked by the Admission Controller to ensure that Container Cloud clusters remain consistently updated with the latest security fixes and product improvements


The pre-update inspection applies only to images delivered by Container Cloud that are overwritten. Any custom images unrelated to the product components are not verified and do not block cluster update.

Post-update actions

Upgrade OpenStack to Antelope

With 24.1, MOSK is rolling out OpenStack Antelope support for both Open vSwitch and Tungsten Fabric-based deployments.

Mirantis encourages you to upgrade to Antelope to start benefitting from the enhanced functionality and new features of this OpenStack release. MOSK allows for direct upgrade from Yoga to Antelope, without the need to upgrade to the intermediate Zed release. To upgrade the cloud, complete the Upgrade OpenStack procedure.

Disable Tungsten Fabric analytics services

If your cluster runs Tungsten Fabric analytics services and you want to obtain a more lightweight setup, you can disable these services through the custom resource of the Tungsten Fabric Operator. For the details, refer to the Tungsten Fabric analytics services deprecation notice.