Perfect! It worked.
The only problem I had was that it is difficult to access the current container because it is restarting all the time.
I had thought to enter the data container that have been using since version 0.28 and make the change there in the database.
What information really keeps that data container that is reused by new versions? MySQL data, are in that container or does every new rancher-server version create a new database?
Thank you very much.