Gunicorn Troubleshooting Scenarios

Scenario: "Melbourne": WSGI with Gunicorn

Level: Medium

Type: Fix

Access: Paid

Description: There is a Python WSGI web application file at /home/admin/wsgi.py , the purpose of which is to serve the string "Hello, world!". This file is served by a Gunicorn server which is fronted by an nginx server (both servers managed by systemd). So the flow of an HTTP request is: Web Client (curl) -> Nginx -> Gunicorn -> wsgi.py . The objective is to be able to curl the localhost (on default port :80) and get back "Hello, world!", using the current setup.

Test: curl -s http://localhost returns Hello, world! (serving the wsgi.py file via Gunicorn and Nginx)

Time to Solve: 40 minutes.

Scenario: "Banha" : Intermittent 504 Gateway Time-Out errors

Level: Medium

Type: Fix

Access: Email

Description: Our Python Flask web application, served via Gunicorn and Nginx, is experiencing intermittent 504 Gateway Time-Out errors on concurrent requests. Users report that the application works perfectly at times, but fails unexpectedly at others. Your task is to identify the root cause of these sporadic failures and implement a permanent fix to ensure the applications consistent stability on port 80.

Test: curl http://localhost/ returns "Hello from Flask!" consistently, even on parallel load: seq 15 | xargs -n1 -P15 curl -sf --max-time 5 http://localhost/ && echo OK || echo FAIL.

The "Check My Solution" button runs the script /home/admin/agent/check.sh, which you can see and execute.

Time to Solve: 20 minutes.