Mirantis Container Cloud (MCC) becomes part of Mirantis OpenStack for Kubernetes (MOSK)!

Now, the MOSK documentation set covers all product layers, including MOSK management (formerly Container Cloud). This means everything you need is in one place. Some legacy names may remain in the code and documentation and will be updated in future releases. The separate Container Cloud documentation site will be retired, so please update your bookmarks for continued easy access to the latest content.

Upgrade an operating system distribution

Caution

Usage of third-party software, which is not part of Mirantis-supported configurations, for example, the use of custom DPDK modules, may block upgrade of an operating system distribution. Users are fully responsible for ensuring the compatibility of such custom components with the latest supported Ubuntu version.

Distribution upgrade of an operating system (OS) is implemented for management and MOSK clusters.

For management clusters, an OS distribution upgrade occurs automatically as part of cluster update and requires machines reboot. The upgrade workflow is as follows:

  1. The distribution ID value is taken from the id field of the distribution from the allowedDistributions list in the spec of the ClusterRelease object.

  2. The distribution that has the default: true value is used during update. This distribution ID is set in the spec:providerSpec:value:distribution field of the Machine object during cluster update.

For MOSK clusters, an in-place OS distribution upgrade should be performed between cluster updates. This scenario implies a machine cordoning, draining, and reboot. Upgrading all nodes at once is not mandatory. You can upgrade them individually or in small batches, depending on time constraints in the maintenance window.

The table below illustrates the correlation between the cluster updates and upgrade to Ubuntu 22.04 and 24.04 to help you effectively plan and perform the upgrade.

Correlation between cluster updates and upgrade to Ubuntu 22.04 and 24.04

Management cluster version

MOSK cluster version

Default Ubuntu version

Key impact

Action required

2.30.0
25.1.x
25.2
22.04
24.04 0

No impact

Management cluster nodes are automatically upgraded to Ubuntu 24.04 during cluster update to MOSK management 2.30.0 (Cluster release 20.0.0).

Upgrade of MOSK clusters to Ubuntu 24.04 will become available in one of the following releases.
0

Ubuntu 22.04 on MOSK clusters and Ubuntu 24.04 on management clusters.