After upgrade M->N horizon doesn't work

[Vitaliy Nogin]

Detailed bug description:
After upgrade M->N horizon doesn't work

Error message from horizon-error.log:

[:error] [pid 3086:tid 140688128423680] Invalid HTTP_HOST header: u'infra1_horizon_container-2a61be7d:80'. The domain name provided is not valid according to RFC 1034/1035.

From my point of view we should use ip-addresses here instead of container name.

Steps to reproduce:
Upgrade OSAD from M to N

Expected results:
Ability to open dashboard

Actual result:
503 Service Unavailable error

Reproducibility:
100%

Workaround:
Change ServerName value in /etc/apache2/sites-available/openstack-dashboard.conf file from container name to container ip-address and restart apache2 service.

Impact:
-

[Jean-Philippe Evrard (jean-philippe-evrard)]

FYI, this was done from a 13.0.1 instead of a latest M (13.1.3) to latest N.

[Jean-Philippe Evrard (jean-philippe-evrard)]

As a reminder, the mitaka branch was the location of a major change in OSA: hostnames changes (RFC1035 support).

[Jean-Philippe Evrard (jean-philippe-evrard)]

M->N is still heavily WIP. Please see the blueprint here: https://blueprints.launchpad.net/openstack-ansible/+spec/upgrade-mitaka-newton

[Jean-Philippe Evrard (jean-philippe-evrard)]

This should be fixed. Please have a look at the following review:
https://review.openstack.org/#/c/350955/