diff options
Diffstat (limited to 'doc/source/admin/upgrades.rst')
| -rw-r--r-- | doc/source/admin/upgrades.rst | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/doc/source/admin/upgrades.rst b/doc/source/admin/upgrades.rst index 00a714970b..61fd0cf258 100644 --- a/doc/source/admin/upgrades.rst +++ b/doc/source/admin/upgrades.rst @@ -41,21 +41,27 @@ Rolling upgrade process To reduce downtime, the compute services can be upgraded in a rolling fashion. It means upgrading a few services at a time. This results in a condition where both old (N) and new (N+1) nova-compute services co-exist for a certain time -period. Note that, there is no upgrade of the hypervisor here, this is just +period (or even N with N+2 upgraded nova-compute services, see below). +Note that, there is no upgrade of the hypervisor here, this is just upgrading the nova services. If reduced downtime is not a concern (or lower complexity is desired), all services may be taken down and restarted at the same time. .. important:: - Nova does not currently support the coexistence of N and N+2 or greater - :program:`nova-compute` or :program:`nova-conductor` services in the same - deployment. The `nova-conductor`` service will fail to start when a - ``nova-compute`` service that is older than the previous release (N-2 or - greater) is detected. Similarly, in a :doc:`deployment with multiple cells + As of OpenStack 2023.1 (Antelope), Nova supports the coexistence of N and + N-2 (Yoga) :program:`nova-compute` or :program:`nova-conductor` services in + the same deployment. The `nova-conductor`` service will fail to start when + a ``nova-compute`` service that is older than the support envelope is + detected. This varies by release and the support envelope will be explained + in the release notes. Similarly, in a :doc:`deployment with multiple cells </admin/cells>`, neither the super conductor service nor any per-cell conductor service will start if any other conductor service in the - deployment is older than the previous release. + deployment is older than the N-2 release. + + Releases older than 2023.1 will only support rolling upgrades for a single + release difference between :program:`nova-compute` and + :program:`nova-conductor` services. #. Before maintenance window: |