Downgrade - Rollback Scenario

[Yusuf Güngör]

Hi, is it possible to downgrade after an upgrade? We have MariaDB backup and could not find any documentation about downgrade, is it not supported? If it is supported then how we can downgrade? For example; Stopping all containers on all nodes, then restore the MariaDB from backup and then run the upgrade command from the old kolla-ansible release?

Thanks.

**Environment**:
 OpenStack Victoria Cluster installed via kolla-ansible to Ubuntu 20.04.2 LTS Hosts. (Kernel:5.4.0-80-generic)
 Docker version: 20.10.7
 Kolla-Ansible version: Victoria (kolla-ansible==11.1.0) and Wallaby (kolla-ansible==12.3.0)
 Docker image Install type: Source
 Docker image distribution: DockerHub Images

[Gaël THEROND (gtherond)]

If you don't mind loosing VMs and ressources:

Assuming you want to rollback from B to A:

1°/- Call for kolla-ansible destroy (remove B).
2°/- Call for kolla-ansible deploy (fresh install A).
3°/- Call for kolla-ansible mariadb_recovery (Restore A DB).

Or do you have something else in mind?

[Yusuf Güngör (yusuf2)]

Hi Gaël, thanks for reply. We can not loose VMs, actually we trying to figure out the disaster recovery after an upgrade. If some basic functionality is broken and we have not recongnized it on our tests then we are looking for a way to downgrade.