Comment 9 for bug 1821696

> Also note that it is not necessary to restart any containers to reproduce the error.
> It is sufficient with a Hard Reboot from Horizon GUI.

I can't reproduce this in a F29 devstack env using ceph.

I'm still convinced that you're hitting this due to the associated Libvirt volume secrets going AWOL in your environment before the instance hard reboots.

Again it would be super useful if you could run the following commands within the nova-libvirt container to confirm if the secrets are present before you hard reboot:

$ sudo virsh secret-list
$ sudo ls /etc/libvirt/secrets/

If they aren't then IMHO this is a kolla/kolla-ansible issue.