Create a Python app in Azure App Service on Linux (Preview)

App Service on Linux provides a highly scalable, self-patching web hosting service using the Linux operating system. This quickstart shows how to deploy a Python app on top of the built-in Python image (Preview) in App Service on Linux using the Azure CLI.

You can follow the steps in this article using a Mac, Windows, or Linux machine.

Sample app running in Azure

If you don't have an Azure subscription, create a free account before you begin.

Prerequisites

To complete this quickstart:

Download the sample locally

In a terminal window, run the following commands to clone the sample application to your local machine, and navigate to the directory with the sample code.

git clone https://github.com/Azure-Samples/python-docs-hello-world
cd python-docs-hello-world

The repository contains an application.py, which tells App Service that the repository contains a Flask app. For more information, see Container startup process and customizations.

Run the app locally

Run the application locally so that you see how it should look when you deploy it to Azure. Open a terminal window and use the commands below to install the required dependencies and launch the built-in development server.

# In Bash
python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt
FLASK_APP=application.py flask run

# In PowerShell
py -3 -m venv env
env\scripts\activate
pip install -r requirements.txt
Set-Item Env:FLASK_APP ".\application.py"
flask run

Open a web browser, and navigate to the sample app at http://localhost:5000/.

You see the Hello World! message from the sample app displayed in the page.

Sample app running locally

In your terminal window, press Ctrl+C to exit the web server.

Open Azure Cloud Shell

Azure Cloud Shell is a free, interactive shell that you can use to run the steps in this article. Common Azure tools are preinstalled and configured in Cloud Shell for you to use with your account. Select Copy to copy the code, paste it in Cloud Shell, and then press Enter to run it. There are a few ways to open Cloud Shell:

Select Try It in the upper-right corner of a code block. Cloud Shell in this article
Open Cloud Shell in your browser. https://shell.azure.com/bash
Select the Cloud Shell button on the menu in the upper-right corner of the Azure portal. Cloud Shell in the portal

Download the sample

In the Cloud Shell, create a quickstart directory and then change to it.

mkdir quickstart

cd quickstart

Next, run the following command to clone the sample app repository to your quickstart directory.

git clone https://github.com/Azure-Samples/python-docs-hello-world

While running, it displays information similar to the following example:

Cloning into 'python-docs-hello-world'...
remote: Enumerating objects: 43, done.
remote: Total 43 (delta 0), reused 0 (delta 0), pack-reused 43
Unpacking objects: 100% (43/43), done.
Checking connectivity... done.

Create a web app

Change to the directory that contains the sample code and run the az webapp up command.

In the following example, replace with a unique app name.

cd python-docs-hello-world

az webapp up -n <app-name>

This command may take a few minutes to run. While running, it displays information similar to the following example:

The behavior of this command has been altered by the following extension: webapp
Creating Resource group 'appsvc_rg_Linux_CentralUS' ...
Resource group creation complete
Creating App service plan 'appsvc_asp_Linux_CentralUS' ...
App service plan creation complete
Creating app '<app-name>' ....
Webapp creation complete
Creating zip with contents of dir /home/username/quickstart/python-docs-hello-world ...
Preparing to deploy contents to app.
All done.
{
  "app_url": "https:/<app-name>.azurewebsites.net",
  "location": "Central US",
  "name": "<app-name>",
  "os": "Linux",
  "resourcegroup": "appsvc_rg_Linux_CentralUS ",
  "serverfarm": "appsvc_asp_Linux_CentralUS",
  "sku": "BASIC",
  "src_path": "/home/username/quickstart/python-docs-hello-world ",
  "version_detected": "-",
  "version_to_create": "python|3.7"
}

Note

The az webapp up command does the following actions:

Browse to the app

Browse to the deployed application using your web browser.

http://<app-name>.azurewebsites.net

The Python sample code is running in App Service on Linux with a built-in image.

Sample app running in Azure

Congratulations! You've deployed your first Python app to App Service on Linux.

Update locally and redeploy the code

In the Cloud Shell, type code application.py to open the Cloud Shell editor.

Code application.py

Make a small change to the text in the call to return:

return "Hello Azure!"

Save your changes and exit the editor. Use the command ^S to save and ^Q to exit.

You'll now redeploy the app. Substitute <app-name> with your app.

az webapp up -n <app-name>

Once deployment has completed, switch back to the browser window that opened in the Browse to the app step, and refresh the page.

Updated sample app running in Azure

Manage your new Azure app

Go to the Azure portal to manage the app you created.

From the left menu, click App Services, and then click the name of your Azure app.

Portal navigation to Azure app

You see your app's Overview page. Here, you can perform basic management tasks like browse, stop, start, restart, and delete.

App Service page in Azure portal

The left menu provides different pages for configuring your app.

Clean up resources

In the preceding steps, you created Azure resources in a resource group. If you don't expect to need these resources in the future, delete the resource group by running the following command in the Cloud Shell:

az group delete --name myResourceGroup

This command may take a minute to run.

Next steps

The built-in Python image in App Service on Linux is currently in Preview, and you can customize the command used to start your app . You can also create production Python apps using a custom container instead.