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-rw-r--r--doc/source/reference/tenants.rst16
1 files changed, 16 insertions, 0 deletions
diff --git a/doc/source/reference/tenants.rst b/doc/source/reference/tenants.rst
index 8e8d5f070..a5c828dda 100644
--- a/doc/source/reference/tenants.rst
+++ b/doc/source/reference/tenants.rst
@@ -340,6 +340,22 @@ configuration. Some examples of tenant definitions are:
:ref:`tenant-scoped-rest-api`.
+ .. attr:: authentication-realm
+
+ Each authenticator defined in Zuul's configuration is associated to a realm.
+ When authenticating through Zuul's Web User Interface under this tenant, the
+ Web UI will redirect the user to this realm's authentication service. The
+ authenticator must be of the type ``OpenIDConnect``.
+
+ .. note::
+
+ Defining a default realm for a tenant will not invalidate access tokens
+ issued from other configured realms, especially if they match the tenant's
+ admin rules. This is intended, so that an operator can for example issue
+ an overriding access token manually. If this is an issue, it is advised
+ to add finer filtering to admin rules, for example filtering by the ``iss``
+ claim (generally equal to the issuer ID).
+
.. _admin_rule_definition:
Access Rule