Multiple Signers

You have a cloud, I have a cloud.

Neither of use are willing to surrender control of our OpenStack deployments, but we need to inter-operate.

We both have Keystone servers. Those servers are the system of record for user authorization through out our respective deployments. We each wish to maintain control of our assignments. How can we make a set of resources that can be shared?  It can’t be done today.  Here is why not, and how to make it possible.

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Three Types of Keystone Users

Keystone supports multiple backend for Identity.  While SQL is the default, LDAP is one of the most used.  With Federation protocols, the user data won’t even be stored in the identity backend at all.  All three of these approaches have different use cases, and all work together.  The way that that I’ve come to think of them is as  three types of Keystone users:  employees, partners, and customers.  Take the following as a metaphor, not literal  truth.

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