Pre-Upgrade Testing EnvironmentPreparing for a RollbackUpgradesHow to Perform an Upgrade from Grizzly to Havana—UbuntuImpact on UsersUpgrade ConsiderationsPerform a BackupManage RepositoriesUpdate Configuration FilesUpgrade Packages on the Controller NodeStop Services, Update Database Schemas, and Restart Services on
the Controller NodeUpgrade Packages and Restart Services on the Compute
NodesUpgrade Packages and Restart Services on the Block Storage
NodesHow to Perform an Upgrade from Grizzly to Havana—Red Hat Enterprise
Linux and DerivativesImpact on UsersUpgrade ConsiderationsPerform a BackupManage RepositoriesUpdate Configuration FilesUpgrade Packages on the Controller NodeStop Services, Update Database Schemas, and Restart Services on
the Controller NodeUpgrade Packages and Restart Services on the Compute
NodesUpgrade Packages and Restart Services on the Block Storage
NodesCleaning Up and Final Configuration File UpdatesRolling Back a Failed Upgrade