Create a function app from the Azure portal

Azure Function Apps uses the Azure App Service infrastructure. This topic shows you how to create a function app in the Azure portal. A function app is the container that hosts the execution of individual functions. When you create a function app in the App Service hosting plan, your function app can use all the features of App Service.

Create a function app

  1. Click the New button found on the upper left-hand corner of the Azure portal.

  2. Click Compute > Function App. Then, use the function app settings as specified in the table.

    Create function app in the Azure portal

    Setting Suggested value Description
    App name Globally unique name Name that identifies your new function app. Valid characters are a-z, 0-9, and -.
    Subscription Your subscription The subscription under which this new function app will be created.
    Resource Group myResourceGroup Name for the new resource group in which to create your function app.
    Hosting plan Consumption plan Hosting plan that defines how resources are allocated to your function app. In the default Consumption Plan, resources are added dynamically as required by your functions. You only pay for the time your functions run.
    Location West Europe Choose a location near you or near other services your functions will access.
    Storage account Globally unique name Name of the new storage account used by your function app. Storage account names must be between 3 and 24 characters in length and may contain numbers and lowercase letters only. You can also use an existing account.
  3. Click Create to provision and deploy the new function app.

When you create a function app, supply a valid App name, which can contain only letters, numbers, and hyphens. Underscore (_) is not an allowed character.

Storage account names must be between 3 and 24 characters in length and may contain numbers and lowercase letters only. Your storage account name must be unique within Azure.

After the function app is created, you can create individual functions in one or more different languages. Create functions by using the portal, continuous deployment, or by uploading with FTP.

Service plans

Azure Functions has two different service plans: Consumption plan and App Service plan. The Consumption plan automatically allocates compute power when your code is running, scales-out as necessary to handle load, and then scales-in when code is not running. The App Service plan gives your function app access to all the facilities of App Service. You must choose your service plan when your function app is created, and it cannot currently be changed. For more information, see Choose an Azure Functions hosting plan.

If you are planning to run JavaScript functions on an App Service plan, you should choose a plan with fewer cores. For more information, see the JavaScript reference for Functions.

Storage account requirements

When creating a function app in App Service, you must create or link to a general-purpose Azure Storage account that supports Blob, Queue, and Table storage. Internally, Functions uses Storage for operations such as managing triggers and logging function executions. Some storage accounts do not support queues and tables, such as blob-only storage accounts, Azure Premium Storage, and general-purpose storage accounts with ZRS replication. These accounts are filtered out of from the Storage Account blade when creating a function app.

Note

When using the Consumption hosting plan, your function code and binding configuration files are stored in Azure File storage in the main storage account. When you delete the main storage account, this content is deleted and cannot be recovered.

To learn more about storage account types, see Introducing the Azure Storage Services.

Next steps

Learn how to create functions with other kinds of triggers or how to integrate functions with other Azure services.