Dear all,

we are running an OpenStack deployment Yoga on AlmaLinux 9.5 and we are attempting the upgrade Openstack up to Caracal release, one release at time (Zed--Antelope--Bobcat--Caracal)

The procedure we are following is to shut down all openstack services,  to remove the "old" openstack release and to install the new one, upgrading all service databases.

This procedure works well for Zed and Antelope, but during the installation of the Bobcat release, the Neutron database upgrade fails when creating the new "porthints" table.

The command we are using is

su -s /bin/sh -c "neutron-db-manage --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini upgrade head" neutron

and the error message we receive is

...

  File "/usr/lib/python3.9/site-packages/pymysql/err.py", line 107, in raise_mysql_exception
    raise errorclass(errno, errval)
sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (3780, "Referencing column 'port_id' and referenced column 'id' in foreign key constraint 'porthints_ibfk_1' are incompatible.")
[SQL:
CREATE TABLE porthints (
    port_id VARCHAR(36) NOT NULL,
    hints VARCHAR(4095) NOT NULL,
    PRIMARY KEY (port_id),
    FOREIGN KEY(port_id) REFERENCES ports (id) ON DELETE CASCADE
)ENGINE=InnoDB
...

Our "ports" table uses the collation utf8mb3_general_ci

mysql> SHOW FULL COLUMNS FROM ports;
+------------------+--------------+--------------------+------+-----+---------+-------+---------------------------------+---------+
| Field            | Type         | Collation          | Null | Key | Default | Extra | Privileges                      | Comment |
+------------------+--------------+--------------------+------+-----+---------+-------+---------------------------------+---------+
| project_id       | varchar(255) | utf8mb3_general_ci | YES  | MUL | NULL    |       | select,insert,update,references | |
| id               | varchar(36)  | utf8mb3_general_ci | NO   | PRI | NULL    |       | select,insert,update,references | |
| name             | varchar(255) | utf8mb3_general_ci | YES |     | NULL    |       | select,insert,update,references |         |
| network_id       | varchar(36)  | utf8mb3_general_ci | NO   | MUL | NULL    |       | select,insert,update,references | |
| mac_address      | varchar(32)  | utf8mb3_general_ci | NO |     | NULL    |       | select,insert,update,references |         |
| admin_state_up   | tinyint(1)   | NULL               | NO |     | NULL    |       | select,insert,update,references |         |
| status           | varchar(16)  | utf8mb3_general_ci | NO |     | NULL    |       | select,insert,update,references |         |
| device_id        | varchar(255) | utf8mb3_general_ci | NO   | MUL | NULL    |       | select,insert,update,references | |
| device_owner     | varchar(255) | utf8mb3_general_ci | NO |     | NULL    |       | select,insert,update,references |         |
| standard_attr_id | bigint       | NULL               | NO   | UNI | NULL    |       | select,insert,update,references | |
| ip_allocation    | varchar(16)  | utf8mb3_general_ci | YES |     | NULL    |       | select,insert,update,references |         |
+------------------+--------------+--------------------+------+-----+---------+-------+---------------------------------+---------+

in Bobcat the collation required for the new "porthints" table is  latin1_swedish_ci

MariaDB [neutron]> show create table porthints;
+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table     | Create Table |
+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| porthints | CREATE TABLE `porthints` (
  `port_id` varchar(36) NOT NULL,
  `hints` varchar(4095) NOT NULL,
  PRIMARY KEY (`port_id`),
  CONSTRAINT `porthints_ibfk_1` FOREIGN KEY (`port_id`) REFERENCES `ports` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci |

So, we have tried to create the porthints table in mysql, forcing the collation to utf8mb3_general_ci

mysql> CREATE TABLE porthints ( port_id VARCHAR(36) NOT NULL, hints VARCHAR(4095) NOT NULL, PRIMARY KEY (port_id), FOREIGN KEY(port_id) REFERENCES ports (id) ON DELETE CASCADE )ENGINE=InnoDB DEFAULT CHARSET=utf8 DEFAULT COLLATE utf8mb3_general_ci;
and commenting out the creation of the new table in the neutron code /usr/lib/python3.9/site-packages/neutron/db/migration/alembic_migrations/versions/2023.2/expand/6f1145bff34c_port_hints.py.

In this way, the upgrade works, but we encounter the same kind of problem during the upgrade to Caracal, specifically with the creation of the new table porthardwareoffloadtype.

Have you already encountered this issue during the Neutron upgrade?

Do you have any suggestions on how to upgrade the neutron DB, without manually creating  new tables?

Thanks a lot,

cheers,

   Federica

-- 
Federica Fanzago
INFN Sezione di Padova
Via Marzolo, 8
35131 Padova - Italy

Tel: +39 049.967.7367 
--