The sales management app can no longer find its database, even though the database is running

Kenitra · plant server room · app-gescom-01 · Laiterie Al Gharb · Monday 07:45

Laiterie Al Gharb (Kenitra) enters its delivery orders in Gescom, a Python application (systemd service gescom) installed on app-gescom-01 (Ubuntu 22.04). The PostgreSQL database is on another server, pg-gescom.gharb.lan (10.20.0.21). Names in .gharb.lan are served by the two internal DNS servers 10.20.0.10 and 10.20.0.11.

Yesterday at 17:40, a contractor installed a remote maintenance agent on this server for another purpose. This morning, the sales staff can no longer enter orders: Gescom keeps failing. The trucks leave at 09:00.

You are a systems technician. Find the cause and bring Gescom back into service cleanly.

The sales management app can no longer find its database, even though the database is running

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