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The Ops guide has a chapter on upgrading: https://docs.openstack.org/ops-guide/ops-upgrades.html. Support for rolling upgrades with no or minimal downtime seems to be a hot development topic; see specs and release notes.

The Ops guide has a chapter on upgrading: https://docs.openstack.org/ops-guide/ops-upgrades.html. Support for rolling upgrades with no or minimal downtime seems to be a hot development topic; see specs , e.g. http://specs.openstack.org/openstack/glance-specs/specs/ocata/implemented/glance/alembic-migrations.html, and release notes. .