OpenStack for Architects - Second Edition

Cells

The nova-compute service has the concept of cells, which can be used to segregate large pools of hypervisors within a single region. This technique is primarily used to mitigate the scalability limits of the OpenStack message bus. The deployment at CERN makes wide use of cells to achieve massive scalability within single regions.

A large amount of work went into the second release of cells (called cells V2) in the Ocata release of OpenStack. With cells V2, more services support running in a cell than it did with cells V1, but there are still a number of limitations in Cell-based deployments. Full information on the use of cells is available at: https://docs.openstack.org/nova/latest/user/cells.html.

In our experience, it's much simpler ...