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NOVA stopped Populate the Compute databases with WARNING: cell0 mapping not found - not syncing cell0.

The installation stucked when I typed in

su -s /bin/sh -c "nova-manage db sync" nova

WARNING: cell0 mapping not found - not syncing cell0.

Then there is no output after hours.

I checked the MariaDB and there is no table for nova:

MariaDB [(none)]> use nova

Database changed

MariaDB [nova]> show tables

-> ;

Empty set (0.00 sec)

I have been following the install guide for Netwon ( https://docs.openstack.org/newton/install-guide-rdo/nova-controller-install.html), but it looks the controller box didn't do anything even command keyed in. Is there any way to fix it and continue the installation?

I am using 3.10.0-514.26.2.el7.x86_64 CentOS 7. Thanks.