Deploying a Local FastAPI App to Azure App Service

Deploying a FastAPI application from your local machine to Azure App Service is a straightforward process once you know the sequence. This guide walks through authenticating, provisioning the infrastructure, configuring the runtime, and shipping your code. Replace the placeholder names below with your own resource group and app names.

Authenticate and Select Subscription

Log in to Azure Start by authenticating your CLI session and pointing it at the correct subscription.

az login
az account set --subscription "00000000-1111-2222-3333-444444444444"

Clean Up and Verify Existing Resources

Delete the old app Remove the previous web app if you're starting fresh.

az webapp delete \
  --resource-group myapp-rg \
  --name myapp-sample-test1

Verify existing plans List the App Service plans in your resource group to confirm what's already there.

az appservice plan list --resource-group myapp-rg -o table

Provision the Infrastructure

Create an App Service plan Create a Linux-based plan on the B1 SKU to host the new app.

az appservice plan create \
  --resource-group myapp-rg \
  --name myapp-testing-plan \
  --sku B1 \
  --is-linux

Create the web app Provision the web app on the Python 3.12 runtime, attached to the plan you just created.

az webapp create \
  --resource-group myapp-rg \
  --plan myapp-testing-plan \
  --name myapp-fastapi-13 \
  --runtime "PYTHON:3.12"

Configure Build and Startup

Enable build during deployment Turn on Oryx build automation so dependencies are installed during deployment.

az webapp config appsettings set \
  --resource-group myapp-rg \
  --name myapp-fastapi-13 \
  --settings SCM_DO_BUILD_DURING_DEPLOYMENT=true

Clone your app locally Pull your source code down to your machine.

git clone https://github.com/myorg/fastapi-sample
cd fastapi-sample

Confirm the port binding Make sure your app.py reads the port from the environment so Azure can route traffic correctly.

port = int(os.environ.get("PORT", 8000))
uvicorn.run(app, host="0.0.0.0", port=port)

Set the startup command Tell App Service how to launch your application.

az webapp config set \
  --resource-group myapp-rg \
  --name myapp-fastapi-13 \
  --startup-file "python app.py"

Zip and Deploy

Package the app Create a deployment archive, excluding version control and virtual environment artifacts.

zip -r deploy.zip . -x '*.git*' -x '*__pycache__*' -x '*.venv*' -x '*venv*'

Deploy the archive Push the zip to Azure App Service.

az webapp deploy \
  --resource-group myapp-rg \
  --name myapp-fastapi-13 \
  --src-path deploy.zip \
  --type zip

Stream the logs Watch the live deployment and startup logs to confirm a clean boot.

az webapp log tail \
  --resource-group myapp-rg \
  --name myapp-fastapi-13

Retrieve the Live URL

Get the default hostname Fetch the public URL of your deployed app.

az webapp show \
  --resource-group myapp-rg \
  --name myapp-fastapi-13 \
  --query defaultHostName -o tsv

Your app is now live at myapp-fastapi-13.azurewebsites.net.