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functions-create-storage-blob-triggered-function.md

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Create a function in Azure triggered by Blob storage
Use Azure Functions to create a serverless function that is invoked by items added to a Blob storage container.
d6bff41c-a624-40c1-bbc7-80590df29ded
how-to
10/01/2018
mvc, cc996988-fb4f-47

Create a function in Azure that's triggered by Blob storage

Learn how to create a function triggered when files are uploaded to or updated in a Blob storage container.

Prerequisites

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

Create an Azure Function app

[!INCLUDE Create function app Azure portal]

You've successfully created your new function app.

:::image type="content" source="./media/functions-create-storage-blob-triggered-function/function-app-create-success.png" alt-text="Function app successfully created." border="true":::

Next, you create a function in the new function app.

Create an Azure Blob storage triggered function

  1. Select Functions, and then select + Add to add a new function.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/function-app-quickstart-choose-template.png" alt-text="Choose a Function template in the Azure portal." border="true":::

  2. Choose the Azure Blob Storage trigger template.

  3. Use the settings as specified in the table below the image.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/functions-create-blob-storage-trigger-portal-2.png" alt-text="Name and configure the Blob storage triggered function." border="true":::

    Setting Suggested value Description
    New Function Unique in your function app Name of this blob triggered function.
    Path samples-workitems/{name} Location in Blob storage being monitored. The file name of the blob is passed in the binding as the name parameter.
    Storage account connection AzureWebJobsStorage You can use the storage account connection already being used by your function app, or create a new one.

  4. Select Create Function to create your function.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/functions-create-blob-storage-trigger-portal-3.png" alt-text="Create the Blob storage triggered function." border="true":::

Next, create the samples-workitems container.

Create the container

  1. In your function, on the Overview page, select your resource group.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/functions-storage-resource-group.png" alt-text="Select your Azure portal resource group." border="true":::

  2. Find and select your resource group's storage account.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/functions-storage-account-access.png" alt-text="Access the storage account." border="true":::

  3. Choose Containers, and then choose + Container.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/functions-storage-add-container.png" alt-text="Add container to your storage account in the Azure portal." border="true":::

  4. In the Name field, type samples-workitems, and then select Create.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/functions-storage-name-blob-container.png" alt-text="Name the storage container." border="true":::

Now that you have a blob container, you can test the function by uploading a file to the container.

Test the function

  1. Back in the Azure portal, browse to your function expand the Logs at the bottom of the page and make sure that log streaming isn't paused.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/functions-storage-log-expander.png" alt-text="Expand the log in the Azure portal." border="true":::

  2. In a separate browser window, go to your resource group in the Azure portal, and select the storage account.

  3. Select Containers, and then select the samples-workitems container.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/functions-storage-container.png" alt-text="Go to your samples-workitems container in the Azure portal." border="true":::

  4. Select Upload, and then select the folder icon to choose a file to upload.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/functions-storage-manager-upload-file-blob.png" alt-text="Upload a file to the blob container." border="true":::

  5. Browse to a file on your local computer, such as an image file, choose the file. Select Open and then Upload.

  6. Go back to your function logs and verify that the blob has been read.

    :::image type="content" source="./media/functions-create-storage-blob-triggered-function/function-app-in-portal-editor.png" alt-text="View message in the logs." border="true":::

    [!NOTE] When your function app runs in the default Consumption plan, there may be a delay of up to several minutes between the blob being added or updated and the function being triggered. If you need low latency in your blob triggered functions, consider running your function app in an App Service plan.

Clean up resources

[!INCLUDE Next steps note]

Next steps

You have created a function that runs when a blob is added to or updated in Blob storage. For more information about Blob storage triggers, see Azure Functions Blob storage bindings.

[!INCLUDE Next steps note]