Multi-tenancy in MIT KDC

Firouzeh Jalilian fjalilian at
Fri May 29 21:03:45 EDT 2015

What is the definition of "realm" in MIT KDC?  Is it just different domains?

By definition of "tenant" I am referring to a categorization above the "domains".  For example a tenant could have multiple domains, and when a a user logs in there has to be an indicator of the "tenant" it belongs to besides its the domain. As the domain may not be sufficient to find the tenant the user belongs to. 

Is that something that is supported?

From: kerberos-bounces at <kerberos-bounces at> on behalf of Tim Mooney <Tim.Mooney at>
Sent: Friday, May 29, 2015 4:00 PM
To: kerberos at
Subject: Re: Multi-tenancy in MIT KDC

In regard to: Multi-tenancy in MIT KDC, Firouzeh Jalilian said (at 10:24pm...:

> I would like to know if there is any support currently for multi-tenancy
> in MIT KDC?

What do you mean by multi-tenancy?  Do you mean one krb5kdc process
serving multiple distinct realms?  If so, then yes, that's possible.
We've served 11 different realms from one krb5kdc process.

You have to run separate kadmind processes, each on a separate port,
because those can't serve multiple realms.  On your secondary kdcs,
you also need to run a separate kpropd per realm, each on its own

We've done it for years and it works, but if we were starting over,
these days I'm not certain I would choose the same path.  Depending on
your realms, it might be better to use separate VMs or containers,
depending on what you're comfortable with.

Tim Mooney                                             Tim.Mooney at
Enterprise Computing & Infrastructure                  701-231-1076 (Voice)
Room 242-J6, Quentin Burdick Building                  701-231-8541 (Fax)
North Dakota State University, Fargo, ND 58105-5164
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