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

Starting with MOSK 25.2, the MOSK documentation set covers all product layers, including MOSK management (formerly MCC). This means everything you need is in one place. The separate MCC documentation site will be retired, so please update your bookmarks for continued easy access to the latest content.

Management cluster release notes for older releases

Major and patch versions update path

The primary distinction between major and patch product versions lies in the fact that major release versions introduce new functionalities, whereas patch release versions predominantly offer minor product enhancements, mostly CVE resolutions for your clusters.

Depending on your deployment needs, you can either update only between major Cluster releases or apply patch updates between major releases. Choosing the latter option ensures you receive security fixes as soon as they become available. Though, be prepared to update your cluster frequently, approximately once every three weeks. Otherwise, you can update only between major Cluster releases as each subsequent major Cluster release includes patch Cluster release updates of the previous major Cluster release.

Releases summary
Container Cloud release
Release date
Supported Cluster releases
Summary

2.29.6

Aug 11, 2025
17.4.6
16.4.6

17.4.0
16.4.0

17.3.0
16.3.0

17.3.10
17.3.9
17.3.8
17.3.7
17.3.6
17.3.5
17.3.4
16.4.5
16.4.4
16.4.3
16.4.2
16.4.1
16.3.10
16.3.9
16.3.8
16.3.7
16.3.6
16.3.5
16.3.4

Container Cloud 2.29.6 is the sixth patch release of the 2.29.x release series that contains the following updates:

  • Support for the patch Cluster releases 16.4.6 and 17.4.6 that represents MOSK patch release 25.1.1 patch

  • Support for Mirantis Kubernetes Engine to 3.7.24

  • Support for docker-ee-cli 23.0.18 on MOSK clusters (MCR 23.0.15) and 25.0.10 on management clusters (MCR 25.0.8)

  • Bare metal: update of Ubuntu mirror from ubuntu-2025-06-23-003900 to ubuntu-2025-07-16-003900 along with update of minor kernel version from 5.15.0-142-generic to 5.15.0-143-generic

  • Mandatory migration of container runtime from Docker to containerd

  • Security fixes for CVEs in images

2.29.5

Jul 14, 2025
17.3.10
16.4.5
16.3.10

17.4.0
16.4.0

17.3.0
16.3.0

17.3.9
17.3.8
17.3.7
17.3.6
17.3.5
17.3.4
16.4.4
16.4.3
16.4.2
16.4.1
16.3.9
16.3.8
16.3.7
16.3.6
16.3.5
16.3.4

Container Cloud 2.29.5 is the fifth patch release of the 2.29.x release series that contains the following updates:

  • Support for the patch Cluster releases 16.4.5, 16.3.10, and 17.3.10 that represents MOSK patch release 24.3.7 patch

  • Support for Mirantis Kubernetes Engine to 3.7.23

  • Support for docker-ee-cli 23.0.18 on MOSK clusters (MCR 23.0.15) and 25.0.10 on management clusters (MCR 25.0.8)

  • Bare metal: update of Ubuntu mirror from ubuntu-2025-05-26-003900 to ubuntu-2025-06-23-003900 along with update of minor kernel version from 5.15.0-140-generic to 5.15.0-142-generic

  • Mandatory migration of container runtime from Docker to containerd

  • Security fixes for CVEs in images

2.29.4

Jun 16, 2025
17.3.9
16.4.4
16.3.9

17.4.0
16.4.0

17.3.0
16.3.0

17.3.8
17.3.7
17.3.6
17.3.5
17.3.4
16.4.3
16.4.2
16.4.1
16.3.8
16.3.7
16.3.6
16.3.5
16.3.4

Container Cloud 2.29.4 is the fourth patch release of the 2.29.x release series that contains the following updates:

  • Support for the patch Cluster releases 16.4.4, 16.3.9, and 17.3.9 that represents MOSK patch release 24.3.6 patch

  • Support for Mirantis Kubernetes Engine to 3.7.23

  • Support for docker-ee-cli 23.0.18 on MOSK clusters (MCR 23.0.15) and 25.0.10 on management clusters (MCR 25.0.8)

  • Bare metal: update of Ubuntu mirror from ubuntu-2025-03-31-003900 to ubuntu-2025-05-26-003900 along with update of minor kernel version from 5.15.0-135-generic to 5.15.0-140-generic

  • Mandatory migration of container runtime from Docker to containerd

  • Security fixes for CVEs in images

2.29.3

May 20, 2025
17.3.8
16.4.3
16.3.8

17.4.0
16.4.0

17.3.0
16.3.0

17.3.7
17.3.6
17.3.5
17.3.4
16.4.2
16.4.1
16.3.7
16.3.6
16.3.5
16.3.4

Container Cloud 2.29.3 is the third patch release of the 2.29.x release series that contains the following updates:

  • Support for the patch Cluster releases 16.4.3, 16.3.8, and 17.3.8 that represents MOSK patch release 24.3.5 patch.

  • Support for Mirantis Kubernetes Engine to 3.7.22

  • Support for docker-ee-cli 23.0.18 on MOSK clusters (MCR 23.0.15) and 25.0.10 on management clusters (MCR 25.0.8)

  • Mandatory migration of container runtime from Docker to containerd

  • Security fixes for CVEs in images

2.29.2

Apr 22, 2025
17.3.7
16.4.2
16.3.7

17.4.0
16.4.0

17.3.0
16.3.0

17.3.6
17.3.5
17.3.4
16.4.1
16.3.6
16.3.5
16.3.4

Container Cloud 2.29.2 is the second patch release of the 2.29.x release series that contains the following updates:

  • Support for the patch Cluster releases 16.4.2, 16.3.7, and 17.3.7 that represents MOSK patch release 24.3.4 patch.

  • Support for Mirantis Kubernetes Engine to 3.7.20

  • Support for docker-ee-cli 23.0.17 on MOSK clusters (MCR 23.0.15) and 25.0.9m1 on management clusters (MCR 25.0.8)

  • Mandatory migration of container runtime from Docker to containerd

  • Bare metal: update of Ubuntu mirror to ubuntu-2025-03-31-003900 along with update of minor kernel version to 5.15.0-135-generic

  • Ubuntu base image: support for utils that extend NVMe provisioning options

  • Security fixes for CVEs in images

2.29.1

Mar 26, 2025
17.3.6
16.4.1
16.3.6

17.4.0
16.4.0

17.3.0
16.3.0

17.3.5
17.3.4
16.3.5
16.3.4

Container Cloud 2.29.1 is the first patch release of the 2.29.x release series that introduces the following updates:

  • Support for the patch Cluster releases 16.4.1, 16.3.6, and 17.3.6 that represents MOSK patch release 24.3.3 patch.

  • Support for Mirantis Kubernetes Engine to 3.7.20

  • Support for docker-ee-cli 23.0.17 on MOSK clusters (MCR 23.0.15) and 25.0.9m1 on management clusters (MCR 25.0.8)

  • Mandatory migration of container runtime from Docker to containerd

  • Bare metal: update of Ubuntu mirror to ubuntu-2025-03-05-003900 along with update of minor kernel version to 5.15.0-134-generic

  • Security fixes for CVEs in images

2.29.0

Mar 11, 2025
17.4.0
16.4.0

17.3.0
16.3.0

17.3.5
16.3.5

17.3.4
16.3.4

  • Improvements in the CIS Benchmark compliance for Ubuntu Linux 22.04 LTS v2.0.0 L1 Server

  • Support for MKE 3.7.19

  • Support for MCR 25.0.8

  • Switch of the default container runtime from Docker to containerd and mandatory migration to containerd

  • BareMetalHostInventory instead of BareMetalHost

  • Validation of the Subnet object changes against allocated IP addresses

  • Improvements in calculation of update estimates using ClusterUpdatePlan

2.28.5

Feb 03, 2025
17.3.5
16.3.5

17.3.0
16.3.0

17.2.0
16.2.0

17.3.4
17.2.7
17.2.6
17.2.5
17.2.4
17.2.3
16.3.4
16.3.3
16.3.2
16.3.1
16.2.7
16.2.6
16.2.5
16.2.4
16.2.3

Container Cloud 2.28.5 is the fifth patch release of the 2.28.x release series that introduces the following updates:

  • Support for the patch Cluster release 16.3.5 and 17.3.5 that represents MOSK patch release 24.3.2 patch.

  • Support for Mirantis Kubernetes Engine to 3.7.18 and Mirantis Container Runtime 23.0.15, which includes containerd 1.6.36.

  • Optional migration of container runtime from Docker to containerd.

  • Bare metal: update of Ubuntu mirror to ubuntu-2025-01-08-003900 along with update of minor kernel version to 5.15.0-130-generic.

  • Security fixes for CVEs in images.

2.28.4

Jan 06, 2025
17.3.4
16.3.4

17.3.0
16.3.0

17.2.0
16.2.0

17.2.7
17.2.6
17.2.5
17.2.4
17.2.3
16.3.3
16.3.2
16.3.1
16.2.7
16.2.6
16.2.5
16.2.4
16.2.3

Container Cloud 2.28.4 is the fourth patch release of the 2.28.x release series that introduces the following updates:

  • Support for the patch Cluster release 16.3.4 and 17.3.4 that represents MOSK patch release 24.3.1 patch.

  • Support for Mirantis Kubernetes Engine to 3.7.17 and Mirantis Container Runtime 23.0.15, which includes containerd 1.6.36.

  • Optional migration of container runtime from Docker to containerd.

  • Bare metal: update of Ubuntu mirror to ubuntu-2024-12-05-003900 along with update of minor kernel version to 5.15.0-126-generic.

  • Security fixes for CVEs in images.

  • OpenStack provider: suspension of support for cluster deployment and update

2.28.3

Dec 09, 2024
17.2.7
16.3.3
16.2.7

17.3.0
16.3.0

17.2.0
16.2.0

17.2.6
17.2.5
17.2.4
17.2.3
16.3.2
16.3.1
16.2.6
16.2.5
16.2.4
16.2.3

Container Cloud 2.28.3 is the third patch release of the 2.28.x release series that introduces the following updates:

  • Support for the patch Cluster release 16.3.3.

  • Support for the patch Cluster releases 16.2.7 and 17.2.7 that represents MOSK patch release 24.2.5 patch.

  • Bare metal: update of Ubuntu mirror to ubuntu-2024-11-18-003900 along with update of minor kernel version to 5.15.0-125-generic.

  • Security fixes for CVEs in images.

2.28.2

Nov 18, 2024
17.2.6
16.3.2
16.2.6

17.3.0
16.3.0

17.2.0
16.2.0

17.2.5
17.2.4
17.2.3
16.3.1
16.2.5
16.2.4
16.2.3

Container Cloud 2.28.2 is the second patch release of the 2.28.x release series that introduces the following updates:

  • Support for the patch Cluster release 16.3.2.

  • Support for the patch Cluster releases 16.2.6 and 17.2.6 that represents MOSK patch release 24.2.

  • Support for MKE 3.7.16.

  • Bare metal: update of Ubuntu mirror to ubuntu-2024-10-28-012906 along with update of minor kernel version to 5.15.0-124-generic.

  • Security fixes for CVEs in images.

2.28.1

Oct 30, 2024
17.2.5
16.3.1
16.2.5

17.3.0
16.3.0

17.2.0
16.2.0

17.2.4
17.2.3
16.2.4
16.2.3

Container Cloud 2.28.1 is the first patch release of the 2.28.x release series that introduces the following updates:

  • Support for the patch Cluster release 16.3.1.

  • Support for the patch Cluster releases 16.2.5 and 17.2.5 that represents MOSK patch release 24.2.3 patch.

  • Support for MKE 3.7.15.

  • Bare metal: update of Ubuntu mirror to ubuntu-2024-10-14-013948 along with update of minor kernel version to 5.15.0-122-generic.

  • Security fixes for CVEs in images.

2.28.0

Oct 16, 2024
17.3.0
16.3.0

17.2.0
16.2.0

17.2.4
17.2.3
16.2.4
16.2.3

  • General availability for Ubuntu 22.04 on MOSK clusters

  • Improvements in the CIS Benchmark compliance for Ubuntu Linux 22.04 LTS v2.0.0 L1 Server

  • Support for MKE 3.7.12 on clusters following the major update path

  • Support for MCR 23.0.14

  • Update group for controller nodes

  • Reboot of machines using update groups

  • Amendments for the ClusterUpdatePlan object

  • Refactoring of delayed auto-update of a management cluster

  • Self-diagnostics for management and managed clusters

  • Configuration of groups in auditd

  • Container Cloud web UI enhancements for the bare metal provider

  • Day-2 operations for bare metal:

    • Updating modules

    • Configuration enhancements for modules

  • StackLight:

    • Monitoring of LCM issues

    • Refactoring of StackLight expiration alerts

  • Documentation enhancements

- Cluster release is deprecated and will become unsupported in one of the following Container Cloud releases.