FastAPI container fails to connect to PostgreSQL.
However, the PostgreSQL container is running well and accessible.
I don’t know why this problem is happening.
Here is gist link of Dockerfile, docker-compose.yaml and log when docker-compose is run.
https://gist.github.com/sunwoo1524/9f75b4d3fd295c9829705e23a3b8094d
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The python container should connect on postgres:5432 not localhost. To the web container, localhost is itself, not the physical host running docker
1 point
I changed host to postgres:5432, but python made an error.
sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not translate host name "postgres" to address: Temporary failure in name resolution
2 points
Sorry, I misread your compose file. It should be the name of the PG container, so db:5432
1 point