How can I ensure Azure App Service uses my gunicorn.conf.py when starting my Flask API? I am trying to increase the number of gunicorn workers.

Helms, Benjamin 41

I am deploying a Flask API to Azure App service. However, the API is single threaded when deployed. After following the docs referenced below, I have attempted to increase the number of gunicorn workers by adding a gunicorn.conf.py file. However, the API still only runs with a single worker in App service. I have SSHed in and confirmed the file is deployed in the root directory of the Flask Application. Please advise on how to further troubleshoot.

Microsoft Learn referencing adding the file:
https://learn.microsoft.com/en-us/azure/app-service/configure-language-python#flask-app

Flask Docs:
https://docs.gunicorn.org/en/stable/configure.html#configuration-file

VenkateshDodda-MSFT 21,396 Reputation points Microsoft Employee

2022-07-12T10:11:25.677+00:00

@Helms, Benjamin Thanks for reaching out. Just want to check have your tried to increase the workers count by using --workers property in startup cmdlets as mentioned in the documentation here
Helms, Benjamin 41 Reputation points

2022-07-12T13:36:04.967+00:00

I have not tried that because then the configuration lives outside of the code base and must be managed in every instance of app service.
Helms, Benjamin 41 Reputation points

2022-07-12T20:09:33.98+00:00

@VenkateshDodda-MSFT is there any information on why I am unable to define a conf file as outlined in the Azure docs?
Helms, Benjamin 41 Reputation points

2022-07-12T20:15:26.103+00:00

After trying the cmdlets with the --workers param, the app service does not even startup the service anymore.
VenkateshDodda-MSFT 21,396 Reputation points Microsoft Employee

2022-07-14T05:25:25.067+00:00

@Helms, Benjamin Just want to check As you mentioned earlier that you have added the gunicorn configuration in you gunicorn.conf.py were you able to see the more than single gunicorn workers post doing ssh into the webapp and by running the cmdlet ps auxw|grep gunicron.

If you have more than single gunicorn workers in your app service plan while running the above cmdlet you will be able to see the below output in the ssh console.

Note: If your app folder root contains app.py, application.py, index.py or server.py - with a class callable named app in those files - it will run the following Gunicorn command by default:gunicron app:app

You can refer to this documentation on how to deploy the flask application to azure web app.

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How can I ensure Azure App Service uses my gunicorn.conf.py when starting my Flask API? I am trying to increase the number of gunicorn workers.

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