For the sake of the completeness: no message is displayed in the horizon dashboard, the user is only redirected again and again to the login form, making it hard to understand what the problem could be.
** Also affects: horizon Importance: Undecided Status: New -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Dashboard (Horizon). https://bugs.launchpad.net/bugs/1780974 Title: Horizon broken for multi region setup Status in devstack: New Status in OpenStack Dashboard (Horizon): New Bug description: Hi, Devstack supports multi-region setup according to https://docs.openstack.org/devstack/latest/configuration.html#multi- region-setup. However, when using this setup, with a stable/queens (did not test master branch), user may be unable to log into horizon. The following message is displayed in /var/log/apache2/horizon_error.log : --- snip --- 2018-07-10 13:06:52.280635 ERROR openstack_auth.backend Using signed cookies as SESSION_ENGINE with OPENSTACK_KEYSTONE_MULTIDOMAIN_SUPPORT is enabled. This disables the ability to perform identity operations due to cookie size constraints. --- snip --- User can manually change the session engine and the cache backend by editing /opt/stack/horizon/openstack_dashboard/settings.py, adding the following lines at the end (SESSION_ENGINE may be already being defined earlier) and restarting apache --- snip --- SESSION_ENGINE = 'django.contrib.sessions.backends.cache' CACHES = { 'default': { 'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache', 'LOCATION': '/var/tmp/django_cache', } } --- snip --- It may be nice that devstack automatically perform this kind of configuration (maybe with a better cache backend) when the REGION_NAME, KEYSTONE_REGION_NAME, or MULTI_REGION are changed, or at least to document it in https://docs.openstack.org/devstack/latest/configuration.html#multi- region-setup (as it may be hard to detect when a region is added). Cheers, To manage notifications about this bug go to: https://bugs.launchpad.net/devstack/+bug/1780974/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp