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Hi Mikhail,

(I'm not from the Keystone team, but did some patches for using keystonauth1).

> 
> 2. Even if auth_url is set, it can't be used later, because it is not registered in
> oslo_config [5]

auth_url is actually a dynamic parameter and depends on the keystone auth plugin used
(auth_type=xxx). The plugin which needs this parameter, registers it.

> 
> So I would like to get an advise from keystone team and understand what I
> should do in such cases. Official documentation doesn't add clarity on the
> matter because it recommends to use auth_uri in some cases and auth_url in
> others.
> My suggestion is to add auth_url in the list of keystone authtoken
> middleware config options, so that the parameter can be used by the others.

Yepp, this makes some confusion, but adding auth_url will make a clash with
most (all?) authentication plugins. auth_url can be considered as an 'internal'
option for the keystoneauth1 modules, and not used by anything else (like
the keystonemiddleware itself). However if there would be a more elagant
solution, I would also hear about it.

> 
> Best,
> Mike
> 
Br,
György