This Method of Procedure (MOP) describes the steps to downgrade the OAM and its managed VMs in an OpenStack Environment from the upgraded version to the desired base version.
This section lists the prerequisites for performing the OAM downgrade:
Log on to the EMS GUI.
Navigate to Network → Cluster Management.
Navigate to Configuration History.
From the table, select the revision that contains the same version as the software version to which the node will be downgraded.
Click Restore.
The below scenario represents the configuration history of a cluster in which the system was upgraded from 8.02.02R0 to 10.00.00R00 and then downgraded back to 8.02.02R0.
With SBC 10.00.00R00, select any 8.02.02R000 revision (In this scenario, there are three revisions available as 1,2, and 3).
Consider revision 3 is restored. The OAM will download this revision and push back a new revision (revision 7 in the scenario of version 08.02.02R000).
Auto-reboot of nodes does not work. The user after validating that the active revision in the cluster is the same as the lower version in which the downgrade is expected to perform.