Tested Runtimes for 2027.1 (Indri)

Linux Distribution

At the start of the 2027.1 development cycle, the current LTS or stable distribution versions are:

  • Ubuntu 26.04

  • Debian 13

Additional testing for a smooth upgrade

  • Ubuntu 24.04 (Supported in previous SLURP release 2026.1)

    At least one tempest job should run on Ubuntu 24.04 to ensure that the SLURP release upgrade path (from 2026.1 to 2027.1) works.

Python

It is the policy that each OpenStack release cycle will target the latest available version of Python; default Python runtime on the distributions listed above; and versions used in integration tests at the start of the cycle, at least until the point when all projects have migrated to a later version.

As per the Python testing requirements defined in Project Testing Interface: Python, projects should avoid removing Python versions that have not reached EOL without a solid reason.

Based on the criteria above, all Python-based projects must target and test against, at a minimum:

  • Python 3.11

    Python 3.11 is the minimum supported version for 2027.1. Supporting Python 3.11 does not require full tempest testing, but py311 unit tests are expected as a minimum requirement for all Python projects.

  • Python 3.12 (available as default in Ubuntu 24.04)

    We have not seen significant incompatible changes between Python 3.11 and 3.12 in previous cycles. Projects may skip dedicated py312 test jobs if they are already testing on 3.11 and 3.13. Periodic testing is sufficient.

  • Python 3.13 (available as default in Debian 13)

    We have not seen significant incompatible changes between Python 3.12 and 3.13 in previous cycles. Projects may skip dedicated py313 test jobs if they are already testing on 3.11 and 3.14. Periodic testing is sufficient.

  • Python 3.14 (available as default in Ubuntu 26.04)

    This is the upper bound of required testing for 2027.1. Python 3.14 is the default on Ubuntu 26.04, our primary tested distribution. Full tempest testing coverage is expected on this version.

  • Python 3.15 (expected release October 2026)

    Testing with Python 3.15 is not mandatory for the 2027.1 release.

    Warning

    Project teams should begin testing with Python 3.15 in this cycle, starting with linting and unit test jobs and extending to end-to-end tempest jobs where possible. Incompatibilities should be identified and fixed early. Python 3.15 will likely become mandatory in a future release.

More details on Python requirements can be found in Project Testing Interface: Python.

Advance/Unstable Testing

The following distributions and Python versions are candidates for advance or unstable testing in OpenStack CI/CD. They are not part of integrated testing and may be tested as non-blockers or periodically. This list can be updated during any phase of the development cycle.

  • CentOS Stream 10

  • Rocky Linux 10

  • AlmaLinux 10

    AlmaLinux 10’s continued support for x86_64_v2 makes it a compelling option for project teams due to greater CI node availability. We may need to work through additional packaging deficiencies occasionally. We do not expect any other major differences between these Enterprise Linux distributions. Project teams can make a choice based on their needs.