Release cadence and support cycle

Mirantis aims to release Mirantis OpenStack for Kubernetes (MOSK) software regularly and often.

MOSK software includes OpenStack, Tungsten Fabric, life-cycle management tooling, other supporting software, and dependencies. Mirantis’s goal is to ensure that such updates are easy to install in zero-touch and zero-downtime fashion.

MOSK major and patch releases

MOSK release cadence consists of major, for example, MOSK 24.1, and patch, for example, MOSK 24.1.1 or 24.1.2, releases. The major release with the patch releases based on it are called a release series, for example, MOSK 24.1 series.

Both major and patch release versions incorporate solutions for security vulnerabilities and known product issues. The primary distinction between these two release types lies in the fact that major release versions introduce new functionalities, whereas patch release versions predominantly offer minor product enhancements.

Patch releases strive to considerably reduce the timeframe for delivering CVE resolutions in images to your deployments, aiding in the mitigation of cyber threats and data breaches.


Major release

Patch release

Version update and upgrade of the major product components including but not limited to OpenStack, Tungsten Fabric, Kubernetes, Ceph, and Stacklight 0

Container runtime changes including Mirantis Container Runtime and containerd updates

Changes in public API

Changes in the Container Cloud and MOSK lifecycle management including but not limited to machines, clusters, Ceph OSDs

Host machine changes including host operating system and kernel updates

Patch version bumps of MKE and Kubernetes

Fixes for Common Vulnerabilities and Exposures (CVE) in images

Fixes for known product issues


StackLight subcomponents may be updated during patch releases

Most patch release versions involve minor changes that only require restarting containers on the cluster during updates. However, the product can also deliver CVE fixes on Ubuntu, which includes updating the minor version of the Ubuntu kernel. This kernel update is not mandatory, but if you prioritize getting the latest CVE fixes for Ubuntu, you can manually reboot machines during a convenient maintenance window to update the kernel.

Each subsequent major release includes patch release updates of the previous major release.

You may decide to update between only major releases without updating to patch releases. In this case, you will perform updates from an N to N+1 major release. However, Mirantis recommends applying security fixes using patch releases as soon as they become available.

Starting from MOSK 24.1.5, Mirantis introduces a new update scheme allowing for the update path flexibility.

Update schemes comparison

Before MOSK 24.1.5

Since MOSK 24.1.5

The user cannot update to the intermediate patch version in the series if a newer patch version has been released.

The user can update to any patch version in the series even if a newer patch version has been released already.

If the cluster starts receiving patch releases, the user must apply the latest patch version in the series to be able to update to the following major release.

The user can always update to the newer major version from the latest patch version of the previous series. Additionally, there will be another possibility of major update during the course of the patch series from the patch version released immediately before the target major version. Refer to Update path for 24.1 and 24.2 series for the update possibility illustration.

See also

Cluster update

OpenStack support cycle

Mirantis provides Long Term Support (LTS) for specific versions of OpenStack. LTS includes scheduled updates with new functionality, bug and security fixes. Mirantis intends to introduce support for new OpenStack version once a year. The LTS duration of an OpenStack version is two years.

The diagram below illustrates the current LTS support cycle for OpenStack. The upstream versions not mentioned in the diagram are not supported in the product as well as the upgrade paths from or to such versions.


MOSK supports the OpenStack Victoria version until September, 2023. MOSK 23.2 is the last release version where OpenStack Victoria packages are updated.

If you have not already upgraded your OpenStack version to Yoga, Mirantis highly recommends doing this during the course of the MOSK 23.2 series.

Untitled Diagram

Versions of Tungsten Fabric, underlying Kubernetes, Ceph, StackLight, and other supporting software and dependencies may change at Mirantis discretion. Follow Release Compatibility Matrix and product Release Notes for any changes in product component versions.

Technology Preview features

A Technology Preview feature provides early access to upcoming product innovations, allowing customers to experiment with the functionality and provide feedback.

Technology Preview features may be privately or publicly available but neither are intended for production use. While Mirantis will provide assistance with such features through official channels, normal Service Level Agreements do not apply.

As Mirantis considers making future iterations of Technology Preview features generally available, we will do our best to resolve any issues that customers experience when using these features.

During the development of a Technology Preview feature, additional components may become available to the public for evaluation. Mirantis cannot guarantee the stability of such features. As a result, if you are using Technology Preview features, you may not be able to seamlessly update to subsequent product releases, as well as upgrade or migrate to the functionality that has not been announced as full support yet.

Mirantis makes no guarantees that Technology Preview features will graduate to generally available features.