Comment 12 for bug 1572976

I'm seeing the exact same errors that you are, down to the 'scss.ast: Function not found' lines. I am using RDO Mitaka as well, along with SSL and non-HA.

Aug 04 18:11:06 overcloud-controller-0 python[12804]: ERROR:scss.ast:Function not found: function-exists:1
Aug 04 18:11:09 overcloud-controller-0 systemd[1]: httpd.service start-pre operation timed out. Terminating.

For some reason, I am continuously seeing this problem. It's not something that occurs rarely for me, unfortunately.

I increased the TimeoutStartSec configured for the httpd.service, but it still failed (since it was the start pre-operation that was timing out).

Apparently, I did not increase the timeout in a way that took -- at least, systemctl show httpd.service does not show the change I made to TimeoutStartSec.

systemd runs these two commands before beginning to start apache:
http://paste.openstack.org/show/549307/

The second command takes 2m 47s on my system to complete, which is beyond the default 1m 30s timeout period set.