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diff --git a/docs/requirements/use_cases/georedundancy_cells.rst b/docs/requirements/use_cases/georedundancy_cells.rst new file mode 100644 index 0000000..e1673a6 --- /dev/null +++ b/docs/requirements/use_cases/georedundancy_cells.rst @@ -0,0 +1,61 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 + +Connection between different OpenStack cells +-------------------------------------------- +Description +~~~~~~~~~~~ +There should be an API to manage the infrastructure networks between two +OpenStack cells. (Note: In the Mitaka release of OpenStack cells v1 are +considered as experimental, while cells v2 functionality is under +implementation). Cells are considered to be problematic from maintainability +perspective as the sub-cells are using only the internal message bus and there +is no API (and CLI) to do maintenance actions in case of a network connectivity +problem between the main cell and the sub cells. + +The following figure (:numref:`cells-architecture`) shows the architecture of +the most relevant OpenStack components in multi cell OpenStack environment. + +.. figure:: images/cells-architecture.png + :name: cells-architecture + :width: 50% + +The functionality behind the API depends on the underlying network providers (SDN +controllers) and the networking setup. +(For example OpenDaylight has an API to add new BGP neighbor.) + +OpenStack Neutron should provide an abstracted API for this functionality what +calls the underlying SDN controllers API. + +Derived Requirements +~~~~~~~~~~~~~~~~~~~~~ + - Possibility to define a remote and a local endpoint + - As in case of cells the nova-api service is shared. It should be possible + to identify the cell in the API calls + +Northbound API / Workflow ++++++++++++++++++++++++++ + - An infrastructure network management API is needed + - API call to define the remote and local infrastructure endpoints + - When the endpoints are created neutron is configured to use the new network. + +Dependencies on compute services +++++++++++++++++++++++++++++++++ + None. + +Data model objects +++++++++++++++++++ + - local and remote endpoint objects (Most probably IP addresses with some + additional properties). + +Current implementation +~~~~~~~~~~~~~~~~~~~~~~ + Current OpenStack implementation provides no way to set up the underlay + network connection. + OpenStack Tricircle project [TRICIRCLE]_ + has plans to build up inter datacenter L2 and L3 networks. + +Gaps in the current solution +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + An infrastructure management API is missing from Neutron where the local and + remote endpoints of the underlay network could be configured. |