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Pondering multi-tenant needs in nova.


I am sorting out some possible implementations for the multi-tenant-accounting blueprint, and the related system-usage-records bp,
and I just wanted to run this by anyone interested in such matters.

Basically, for multitenant purposes we need to introduce the concept of an 'account' in nova, representing a customer, that basically acts as a label for a group of resources (instances, etc), and for access control (i.e customer a cannot mess w/ customer b's stuff)

There was some confusion on how best to implement this, in relation to nova's project concept. Projects are kind of like what we want an account to be, but there are some associations (like one project per network) which are not valid for our flat networking setup. I am kind of straw-polling on which is better here:

The options are:
1) Create a new 'account' concept in nova, with an account basically being a subgroup of a project (providers would use a single, default project, with additional projects added if needed for separate brands, or resellers, etc), add in access control per account as well as project, and make sure apis/auth specify account appropriately, have some way for a default account to used (per project) so account doesn't get in the way for non-multitenant users.

2) having account == nova's "project", and changing the network associations, etc so projects can support our model (as well as current models). Support for associating accounts (projects) together for resellers, etc would either be delegated outside of nova or added later (it's not a current requirement).

In either case, accounts would be identified by name, which would be an opaque string an outside system/person would assign, and could structure to their needs (ie. for associating accounts with common prefixes, etc)


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