The default metadata driver for Glance uses sqlalchemy, which implies
there exists a backend database which must be managed. The
glance-manage binary provides a set of commands for making
this easier.

The commands should be executed as a subcommand of ‘db’:

glance-manage db <cmd> <args>

Sync the Database

glance-manage db sync <version> <current_version>

Place a database under migration control and upgrade, creating it
first if necessary.

Determining the Database
Version

glance-manage db version

This will print the current migration level of a Glance database.

Upgrading an Existing
Database

glance-manage db upgrade <VERSION>

This will take an existing database and upgrade it to the specified
VERSION.

Downgrading an Existing
Database

Upgrades involve complex operations and can fail. Before attempting
any upgrade, you should make a full database backup of your production
data. As of Kilo, database downgrades are not supported, and the only
method available to get back to a prior database version is to restore
from backup[1].

[1]: https://wiki.openstack.org/wiki/OpsGuide/Operational_Upgrades#perform-a-backup