But I can't access the dashboard, over the external IP, I'm
getting:
Which external IP do you mean? Please explain your network setup.
Internal Server Error
Please try service httpd restart then check for clues in
/var/log/httpd/horizon_error.log.
openstack-dashboard-2015.1-dev2.el7 worked for me but in a small VM
with 2G RAM and 1G swap I've seen oom-killer in action and httpd was
the first victim, ps_mem shows httpd using >300MB after short browsing
openstack-dashboard pages...
Cheers,
Alan