[Openstack] Pondering multi-tenant needs in nova.
glen.campbell at RACKSPACE.COM
Thu Feb 3 20:42:20 UTC 2011
I think that this could be done in the current proposal. Specifically, the account_id is an arbitrary string that is generated externally to Nova. You could, for example, easily identify an organizational hierarchy. For example, an accountID could be:
>From Nova's point of view, it makes no difference, so long as that string is associated with a usage event and regurgitated when reported. The cloud administrator can interpret it however it chooses. For simple organizations, it could be identical to the project_id, or even just blank. The project_id holds the network information, and the account_id tracks the usage and other notifications.
There's no good reason for Nova to have to model an organization internally; it certainly wouldn't match all the possible org structures available.
From: Devin Carlen <devin.carlen at gmail.com<mailto:devin.carlen at gmail.com>>
Date: Thu, 3 Feb 2011 12:02:38 -0800
To: Monsyne Dragon <mdragon at rackspace.com<mailto:mdragon at rackspace.com>>
Cc: <openstack at lists.launchpad.net<mailto:openstack at lists.launchpad.net>>
Subject: Re: [Openstack] Pondering multi-tenant needs in nova.
We were just talking about this the other day. We definitely need some kind of further hierarchy. I think a typical kind of use case for multi-tenant could be something like:
Enterprise contains Organizations
Organizations contain Organizations and Projects
Projects contain Instances, etc.
In this structure enterprise is just a top level organization. If we structure it this way it would make metering and billing pretty simple.
On Feb 2, 2011, at 5:37 PM, Monsyne Dragon wrote:
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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