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[FAQ Bot] NEW: OperationalError: connection to server at 'localhost' failed in ingest_s #104

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[FAQ Bot] NEW: OperationalError: connection to server at 'localhost' failed in ingest_s #104

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18 changes: 18 additions & 0 deletions ...engineering-zoomcamp/module-1/076_2e70d86eaa_change-pg-host-localhost-docker.md
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---
id: 2e70d86eaa
question: 'OperationalError: connection to server at ''localhost'' failed in ingest_script.py
when running with --pg-host; how to fix by using pgdatabase?'
sort_order: 76
---

To fix the OperationalError when the ingest_script.py connects to PostgreSQL, ensure the database host in the script matches the Docker host name you pass at runtime.

- In ingest_script.py, locate the DB host setting:
`pg_host = "localhost"`

- Change it to:
`pg_host = "pgdatabase"`

- If you started the container with --pg-host=pgdatabase, the host inside the script must be pgdatabase so the connection is directed to the correct container/service.

- After updating, rerun the container with --pg-host=pgdatabase (and ensure the Postgres service is reachable under that host name in the Docker network).