[Openstack-operators] Delegating quota management for all projects to a user without the admin role?

Tim Bell Tim.Bell at cern.ch
Fri Jan 27 06:24:16 UTC 2017

I think you could do something with policy.json to define which operations a given role would have access to. We have used this to provide the centre operator with abilities such as stop/start. The technical details are described at https://openstack-in-production.blogspot.fr/2015/02/delegation-of-roles.html.


From: "Edmund Rhudy (BLOOMBERG/ 120 PARK)" <erhudy at bloomberg.net>
Reply-To: Edmund Rhudy <erhudy at bloomberg.net>
Date: Friday, 27 January 2017 at 00:36
To: openstack-operators <openstack-operators at lists.openstack.org>
Subject: [Openstack-operators] Delegating quota management for all projects to a user without the admin role?

I'm looking for a way to allow a user that does not have the admin role to be able to view and set quota (both Nova/Cinder) for all projects in an OpenStack cluster. For us, the boundary of a Keystone region is coterminous with an OpenStack cluster - we don't currently use any sort of federated Keystone.

Background: we are involved in a project (not the Keystone variety) for integrating Bloomberg's internal budget processes closely with purchasing compute resources. The idea of this system is that you will purchase some number of standardized compute units and then you can allocate them to projects in various OpenStack clusters as you wish. In order to do this, the tool needs to be able to see what Keystone projects you have access to, see how much quota that project has, and modify the quota settings for it appropriately.

For obvious reasons, I'd like to keep the API access for this tool to a minimum. I know that if all else fails, the goal can be accomplished by giving it admin access, so I'm keeping that in my back pocket, but I'd like to exhaust all reasonable options first.

Allowing the tool to see project memberships and get project information is easy. The quota part, however, is not. I'm not sure how to accomplish that delegation, or how to give the tool admin-equivalent access for a very small subset of the APIs. I'm unfamiliar with Keystone trusts and am not sure it would be appropriate here anyway, because it would seem like I'd need to delegate admin control to the role user in order to allow quota get/set. The only other thing I can think of, and it seems really off the wall to me, is to:

* create a local domain in Keystone
* create one user in this local domain per every Keystone project and add it to that project
* give this user a special role that allows it to set quotas for its project
* set up a massive many-to-one web of trusts where all of these users are delegated back to the tool's account

This solution seems very convoluted, and the number of trusts the tool will need to know about is going to grow linearly with the number of projects in Keystone.

The clusters in question are all running Liberty, with Keystone v3 available. Keystone is in a single-domain configuration, where the default domain is sourcing users from LDAP and all other information is stored in SQL.

Anyone have any thoughts, or am I SOL and just have to give this thing admin access and make sure the creds stay under lock and key?
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