error when Install and configure controller node in zun

[massimo vescio]

After installing Openstack with the official guide (Devstack) on the Ubuntu 20.04 controller, I try to install Zun as described in the official guide. After the instruction "su -s / bin / sh -c" zun-db-manage upgrade "zun" used to populate the database, the following error appears:
Traceback (most recent call last):
  File "/ usr / local / bin / zun-db-manage", line 10, in <module>
    sys.exit (main ())
  File "/usr/local/lib/python3.8/dist-packages/zun/cmd/db_manage.py", line 67, in main
    CONF.command.func ()
  File "/usr/local/lib/python3.8/dist-packages/zun/cmd/db_manage.py", line 29, in do_upgrade
    migration.upgrade (CONF.command.revision)
  File "/usr/local/lib/python3.8/dist-packages/zun/db/migration.py", line 35, in upgrade
    return get_backend (). upgrade (version)
  File "/usr/local/lib/python3.8/dist-packages/zun/db/sqlalchemy/migration.py", line 75, in upgrade
    get_manager (). upgrade (version)
  File "/usr/local/lib/python3.8/dist-packages/zun/db/sqlalchemy/migration.py", line 49, in get_manager
    _MANAGER = manager.MigrationManager (migration_config)
  File "/usr/local/lib/python3.8/dist-packages/debtcollector/removals.py", line 242, in wrapper
    return f (* args, ** kwargs)
  File "/usr/local/lib/python3.8/dist-packages/oslo_db/sqlalchemy/migration_cli/manager.py", line 54, in __init__
    raise ValueError ('There must be at least one plugin active.')
ValueError: There must be at least one plugin active.

[caozhzh (caozhzh)]

like this https://bugs.launchpad.net/zun/+bug/1718865
in my environment,I copy the file from zun source code to python lib dir,and rerun is ok.

root@controller:/home/stack# cd /var/lib/zun/zun/zun/db/sqlalchemy
root@controller:/var/lib/zun/zun/zun/db/sqlalchemy# cp -r alembic /usr/local/lib/python3.10/dist-packages/zun/db/sqlalchemy/
root@controller:/var/lib/zun/zun/zun/db/sqlalchemy# cp alembic.ini /usr/local/lib/python3.10/dist-packages/zun/db/sqlalchemy/