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They were used indirectly I think when you had some services configured for v2 only authentication support because the service didn't work with v2. For example nova->neutron was v2 only for a while. I think all services are supporting v3 these days so that would no longer be necessary?

Thanks,
Kevin
________________________________
From: Lance Bragstad [lbragstad at gmail.com]
Sent: Tuesday, February 09, 2016 9:06 AM
To: OpenStack Development Mailing List (not for usage questions); openstack-operators at lists.openstack.org
Subject: [Openstack-operators] [keystone] Usage of trusts with v2.0 authentication

When trusts were implemented, they were designed to work as an extension under the version 3 API. The implementation didn't prevent the use of a trust to authenticate against version 2.0, which was never officially documented in the v2.0 API docs.

The keystone team is curious if there is anyone creating trusts using v3 and then using them against version 2.0. If not, we'd like to remove/deprecate support for that case in v2.0. If so, then we'll have to add official documentation for trusts against v2.0 and incorporate that case into fernet.

Thanks!

Lance
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