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Nothing works after reboot of controller node - internal server error 500

So this error seems to be constantly occurring in different places in my openstack implementation.

But specifically, do I need to do something to restart services on reboot of my controller node? If I reboot it I cannot get any openstack command to run and get this error:

Discovering versions from the identity service failed when creating the password plugin. Attempting to determine version from URL. Internal Server Error (HTTP 500)

This person seems to have had a similar issue:

But again this seems to refer to a file that as far as I can tell is part of the horizon/dashboard configuration which I have not got to yet as I only have identity and image services running so far.

I have tried restarting apache2 and checked that keystone is running but didnt help.

Thanks for any advice