[Bug] Week1: Airflow login credentials undiscoverable on fresh setup

Environment

• OS: macOS
• Docker Desktop: 28.1.1
• UV: 0.7.x
• Python: 3.12

Summary

The Week 1 notebook assumes Airflow 3.x's simple_auth_manager is in use, which generates a password file at a known path. However the container is actually configured with Flask AppBuilder database auth (AUTH_DB), so the file is never created and students have no way to discover the auto-generated admin password.

Steps to Reproduce

1. Follow the Week 1 notebook setup
2. Run the Get Airflow Password cell:
   python复制

   password_file = project_root / "airflow" / "simple_auth_manager_passwords.json.generated"

3. Cell prints: ⚠ Password file not found
4. Manually checking inside the container confirms the file does not exist:
   bash复制

   docker exec rag-airflow find /opt/airflow -name "*.generated"
   # (no output)

5. Opening http://localhost:8080 shows a login prompt with no usable credentials

Root Cause

webserver_config.py inside the container uses AUTH_TYPE = AUTH_DB (Flask AppBuilder), not Airflow 3.x's SimpleAuthManager. With AUTH_DB, Airflow creates the admin user in the database during initialization but does not write a password file. The notebook's password-reading cell is written for the wrong auth backend.

Workaround

Reset the auto-created admin password manually:

docker exec -it rag-airflow airflow users reset-password \
  --username admin \
  --password admin

Then log in at http://localhost:8080 with admin / admin.

Fix

Pick one of the following:

Option A: Update the notebook cell to use airflow users list to confirm the admin user exists and instruct students to reset the password via the CLI command above.

Option B: Switch the container to Airflow 3.x's SimpleAuthManager so the password file is generated as the notebook expects, by adding to the Airflow environment in compose.yml:

AIRFLOW__CORE__AUTH_MANAGER: airflow.providers.fab.auth_manager.fab_auth_manager.FabAuthManager

Option C: Hardcode a known admin password in compose.yml using the _AIRFLOW_WWW_USER_PASSWORD environment variable and document it in the notebook:

_AIRFLOW_WWW_USER_CREATE: "true"
_AIRFLOW_WWW_USER_USERNAME: admin
_AIRFLOW_WWW_USER_PASSWORD: admin