huankimtran commented on issue #19886:
URL: https://github.com/apache/superset/issues/19886#issuecomment-1374713722

   Encountered same problem. This seems to be caused by the db service was not 
able to start by the time superset_app try to connect to it. The root cause for 
db service failure need to be addressed first. In my case, I found the root 
cause for db service failure by bringing up only db service 
   
   ```
   # Bring down everything first
   docker-compose down
   # Bring up only db service
   docker-compose up db
   ```
   
   The problem in my case was
   ```
   db_1                    | PostgreSQL Database directory appears to contain a 
database; Skipping initialization
   db_1                    | 
   db_1                    | 2023-01-08 04:16:00.303 UTC [1] FATAL:  database 
files are incompatible with server
   db_1                    | 2023-01-08 04:16:00.303 UTC [1] DETAIL:  The data 
directory was initialized by PostgreSQL version 14, which is not compatible 
with this version 10.21 (Debian 10.21-1.pgdg90+1).
   ```
   
   so my previous docker-compose up runs have created a database and the 
database is not at the right version. The old database is saved in 
superset_db_home volume. So what I had to do was remove this volume
   
   ```
   docker volume rm superset_db_home
   ```
   
   Then rerun docker-compose up
   
   


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