Preface

I have a FastAPI app. The most important part for that is: In app.main there exists the object app which is the app that should run. I want to deploy that to an Azure App Service.

Azure Preparation

  • In Azure, select App Services and create a new app.
  • Choose a subscription and a resource group.
  • Web app name should obviously be unique; at least this will be used as the endpoint.
  • As region I chose West Europe.
  • Linux plan - I just created a new one.
  • Pricing plan - I chose “Free F1” as this is just for testing.
  • Keep the rest as is and directly go to “Review + Create”.
  • Check everything and click “Create” again.

App Configuration

  • Every configuration my application reads from the command line should be set in the app in “Configuration”, as “Application Setting”.
  • Add another configuration: SCM_DO_BUILD_DURING_DEPLOYMENT with value true. We will (for now) do manual deployment via command line, hence this is required.
  • Configure the path to execute: In the configuration settings, go to “General settings” and update the startup command as follows:
      gunicorn -w 4 -k uvicorn.workers.UvicornWorker app.main:app
    Not quite sure yet why we are using gunicorn here…

App deployment

Next steps are mostly done from your local command line.

  • Generate a zip file out.zip with all the required files:
    • app/*.py
    • requirements.txt
  • Push your files to Azure:
      az webapp deploy --resource-group ${your_resource_group} --name ${your_app_name} --src-path out.zip

Success!

Now the webapp should be available via https://${your_app_name}.azurewebsites.net.