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Failed to discover available identity versions when trying to create Keystone domain

Hi all,

I have been following the manual deployment guide for OpenStack Stein on Ubuntu Server 18.04 using VirtualBox VM (Here's a link of where I'm currently at in the process, as of now I have installed keystone and properly configured everything as described in the installation guide). However, when trying to execute 'openstack domain create --description "An example domain" example I get the following error:

Failed to discover available identity versions when contacting http://controller:5000/v3. Attempting to parse version from URL. Unable to establish connection to http://controller:5000/v3/auth/tokens: HTTPConnectionPool(host='controller',port=5000): Max retries exceeded with url: /v3/auth/tokens (Caused by NewConnectionError(',<urllib3.connection.httpconnection object="" at="" 0x7f675fb52c18="">: Failed to establish a new connection: [Errno 111] Connection refused',))

I've triple checked all configuration files and environment variables exported, and checked that all services were running (i.e. rabbitmq, apache2, etcd, memcached, and chrony) to make sure everything is correct as in the installation guide, I've had no problems up till now. I've tried searching many resources trying to figure out this issue, but was unsuccessful. This is all new to me and I would appreciate it if anyone provided some insight/solution for the issue I am facing.