@@ -742,6 +742,16 @@ In RegionTwo:

     KEYSTONE_SERVICE_HOST=<KEYSTONE_IP_ADDRESS_FROM_REGION_ONE>

     KEYSTONE_AUTH_HOST=<KEYSTONE_IP_ADDRESS_FROM_REGION_ONE>

     REGION_NAME=RegionTwo

+    KEYSTONE_REGION_NAME=RegionOne

+

+In the devstack for RegionOne, we set REGION_NAME as RegionOne, so region of

+the services started in this devstack are registered as RegionOne. In devstack

+for RegionTwo, similarly, we set REGION_NAME as RegionTwo since we want

+services started in this devstack to be registered in RegionTwo. But Keystone

+service is started and registered in RegionOne, not RegionTwo, so we use

+KEYSTONE_REGION_NAME to specify the region of Keystone service.

+KEYSTONE_REGION_NAME has a default value the same as REGION_NAME thus we omit

+it in the configuration of RegionOne.

 Disabling Identity API v2

 +++++++++++++++++++++++++

@@ -1020,7 +1020,7 @@ export OS_USER_DOMAIN_ID=default

 export OS_PASSWORD=$ADMIN_PASSWORD

 export OS_PROJECT_NAME=admin

 export OS_PROJECT_DOMAIN_ID=default

-export OS_REGION_NAME=$REGION_NAME

+export OS_REGION_NAME=$KEYSTONE_REGION_NAME

 EOF

@@ -42,6 +42,12 @@ fi

 # Specify region name Region

 REGION_NAME=${REGION_NAME:-RegionOne}

+# Specify name of region where identity service endpoint is registered.

+# When deploying multiple DevStack instances in different regions with shared

+# Keystone, set KEYSTONE_REGION_NAME to the region where Keystone is running

+# for DevStack instances which do not host Keystone.

+KEYSTONE_REGION_NAME=${KEYSTONE_REGION_NAME:-$REGION_NAME}

+

 # Specify which services to launch.  These generally correspond to

 # screen tabs. To change the default list, use the ``enable_service`` and

 # ``disable_service`` functions in ``local.conf``.