Exercise - Create and deploy a web app from a Docker image

  • 10 minutes

Azure App Service provides the hosting environment for an Azure-based web app. You can configure App Service to retrieve the image for the web app from a repository in Azure Container Registry.

In the example scenario, the team has uploaded the image for the web app to Azure Container Registry and is now ready to deploy the web app.

In this unit, you'll create a new web app by using the Docker image stored in Azure Container Registry. You'll use App Service with a predefined App Service plan to host the web app.

Enable Docker access to the Azure Container Registry

You'll use Docker to log in to the registry and pull the web image that you want to deploy. Docker needs a username and password to perform this action. The Container Registry enables you to set the registry name as the username and the admin access key as the password to allow Docker to log in to your container registry.

  1. Sign in to the Azure portal, and go to All resources. The All resources pane appears.

  2. Select the container registry you created earlier to go to its Overview page.

  3. In the left menu pane, under Settings, select Access keys. The Access keys pane appears for your container registry.

  4. Check the Admin user box. This change saves automatically.

You're now ready to create your web app.

Create a web app

  1. Go back to the Azure portal home page, and under Azure services, select Create a resource. The Create a resource pane appears.

  2. In the left menu pane, select Web, and under Popular Azure services, select Web App.

    Screenshot that shows the Azure Marketplace with Web App selected.

    The Create Web App pane appears.

  3. On the Basics tab, enter the following values for each setting.

    Setting Value
    Project Details
    Subscription Select your default Azure subscription in which you're allowed to create and manage resources.
    Resource Group From the dropdown list, select the existing resource group learn-deploy-container-acr-rg.
    Instance Details
    Name Enter a unique name and make a note of it for later.
    Publish Docker Container
    Operating System Linux
    Region Select the same location that is close to you from previous exercise.
    Pricing plans
    Linux plan Use the default.
    Pricing plan Use the default.
    Zone redundancy
    Zone redundancy Use the default.

  4. Select the Docker tab at the top of the screen.

  5. On the Docker tab, enter the following values for each setting.

    Setting Value
    Options Single Container
    Image Source Azure Container Registry
    Azure container registry options
    Registry Select your registry.
    Image webimage
    Tag latest
    Startup Command Leave this setting empty.

  6. Select Review and create, and then select Create. Wait until the web app has been deployed before you continue.

Test the web app

  1. After deployment succeeds, select Go to resource to see the web app you just created. Your App service pane appears for your web app.

  2. In the top menu bar, select Browse to open the site in a new browser tab.

  1. After the cold-start delay while your app's Docker image loads and starts, you'll see a page like the following image:

    Screenshot of the sample Docker image.

  1. After the cold-start delay while your app's Docker image loads and starts, you'll see a page like the following image:

    Screenshot of the sample Welcome to Express.

App Service is now hosting the app from your Docker image.