We are trying to update our Ocata cloud to Pike (this is the first step: we will go through Ocata --> Pike --> Queens --> Rocky) but we have a problem with nova-manage db sync:

[root@cld-ctrl-01 ~]# su -s /bin/sh -c "nova-manage db sync" nova
ERROR: Could not access cell0.
Has the nova_api database been created?
Has the nova_cell0 database been created?
Has "nova-manage api_db sync" been run?
Has "nova-manage cell_v2 map_cell0" been run?
Is [api_database]/connection set in nova.conf?
Is the cell0 database connection URL correct?
Error: "Database schema file with version 390 doesn't exist."

We have these settings in nova.conf:

[database]
connection = mysql+pymysql://nova_prod:xyz@192.168.60.10:6306/nova_prod

[api_database]
connection = mysql+pymysql://nova_api_prod:xyz@192.168.60.10:6306/nova_api_prod

I can't see problems accessing the databases. i.e. these commands work:

mysql -u nova_api_prod -pxyz -h 192.168.60.10 -P 6306 nova_api_prod

mysql -u nova_prod -pxyz -h 192.168.60.10 -P 6306 nova_prod

mysql -u nova_prod -pxyz -h 192.168.60.10 -P 6306 nova_prod_cell0

If I try to rerun nova-manage cell_v2 map_cell0:

[root@cld-ctrl-01 ~]# nova-manage cell_v2 map_cell0
Cell0 is already setup

[root@cld-ctrl-01 ~]# su -s /bin/sh -c "nova-manage api_db version" nova
45

[root@cld-ctrl-01 ~]# su -s /bin/sh -c "nova-manage db version" nova
362

[root@cld-ctrl-01 ~]# nova-manage cell_v2 list_cells
+-------+--------------------------------------+--------------------------------------------------+-------------------------------------------------------------------+
| Name | UUID | Transport URL | Database Connection |
+-------+--------------------------------------+--------------------------------------------------+-------------------------------------------------------------------+
| cell0 | 00000000-0000-0000-0000-000000000000 | none:/// | mysql+pymysql://nova_prod:****@192.168.60.10:6306/nova_prod_cell0 |
| cell1 | 5e42faa0-710b-4967-bb42-fcf53602c96e | rabbit://openstack_prod:****@192.168.60.183:5672 | mysql+pymysql://nova_prod:****@192.168.60.10:6306/nova_prod |
+-------+--------------------------------------+--------------------------------------------------+-------------------------------------------------------------------+

Following some doc we also tried to specify the --database_connection / --database-connection argument, but this seems not working

Setting nova in debug mode, this is the last entry in the nova-manage log file:

2019-07-16 12:11:42.774 22013 DEBUG migrate.versioning.repository [req-8ca52407-dbe1-4a62-ad6c-16631c2a9a06 - - - - -] Config: OrderedDict([('db_settings', OrderedDict([('__name__', 'db_settings'), ('repository_id', 'nova'), ('version_table', 'migrate_version'), ('required_dbs', '[]')]))]) __init__ /usr/lib/python2.7/site-packages/migrate/versioning/repository.py:83

Any hints ?

Thanks, Massimo