When configuring the Dashboard part, I came across a problem when trying to login controller/horizon.

The log in /var/log/apache2/error shows:

RuntimeError: Unable to create a new session key. It is likely that the cache is unavailable.

Looked up some websites, I resolved this issue by modifying file /etc/memcached.conf, changed -l 10.145.254.24 to 0.0.0.0

root@controller:~# service apache2 reload

root@controller:~# service memcached restart

It worked. However, according to some sources, this is not the standard way to do, because of some security issue.

reference links:

https://bugs.launchpad.net/openstack-manuals/+bug/1653842

https://ask.openstack.org/en/question/91657/runtimeerror-unable-to-create-a-new-session-key-it-is-likely-that-the-cache-is-unavailable-authorization-failed-the-request-you-have-made-requires/

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