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  1. Extending
  2. Custom File Systems (IFileSystem)

Using Azure Blob Storage for Media and ImageSharp Cache

Setup your site to use Azure Blob storage for media and ImageSharp cache

PreviousCustom File Systems (IFileSystem)NextConfiguring Azure Key Vault

Last updated 5 months ago

There are some scenarios where you may want or need to consider leveraging Azure Blob Storage. An example would be for media in Umbraco sites with substantial media libraries.

Having your site's media in Azure Blob Storage can help your deployments complete more quickly. This has the potential to positively affect site performance, as the ImageSharp cache is moved to Azure Blob Storage.

The setup consists of adding a package to your site, setting the correct configuration, and adding the services and middleware. Before you begin you’ll need to create an Azure Storage Account and a container for your media and ImageSharp cache. In this example, we assume your container name is "mysitestorage" and has already been created.

See the for a quickstart guide on how to create a blob storage container.

Installing the package

Before you begin, you need to install the Umbraco.StorageProviders.AzureBlob and the Umbraco.StorageProviders.AzureBlob.ImageSharp NuGet packages. There are two approaches to installing the packages:

  1. Use your favorite Integrated Development Environment (IDE) and open up the NuGet Package Manager to search and install the packages

  2. Use the command line to install the packages

Installing through command line

Navigate to your project folder, which is the folder that contains your .csproj file. Now use the following dotnet add package commands to install the packages:

dotnet add package Umbraco.StorageProviders.AzureBlob
dotnet add package Umbraco.StorageProviders.AzureBlob.ImageSharp

The correct packages will have been installed in your project.

Configuring Blob storage

The next step is to configure your blob storage. There are multiple approaches for this, but in this document, we're going to do it through appsettings.json. For more configuration options, see the on the GitHub repository.

Open up your appsettings.json file and add the connection string and container name under Umbraco:Storage:AzureBlob:Media. Your Umbraco section of appsettings will look something like this:

  "Umbraco": {
    "Storage": {
      "AzureBlob": {
        "Media": {
          "ConnectionString": "DefaultEndpointsProtocol=https;AccountName=<media account name>;AccountKey=<media account key>;EndpointSuffix=core.windows.net",
          "ContainerName": "mysitestorage"
        }
      }
    },
    "CMS": {
      "Hosting": {
        "Debug": false
      },
      {...}
    }
  }

In this example, the container name is mysitestorage.

You can get your connection string from your Azure Portal under "Access Keys".

Setting the services and middleware

You are almost there. The last step is to set up the required services and middleware. This can be done using extension methods.

Invoke the .AddAzureBlobMediaFileSystem() and the .AddAzureBlobImageSharpCache() extension methods using the CreateUmbracoBuilder() builder chain in the Program.cs file like shown below.

builder.CreateUmbracoBuilder()
    .AddBackOffice()
    .AddWebsite()
    .AddDeliveryApi()
    .AddComposers()
    .AddAzureBlobMediaFileSystem() // This configures the required services for Media
    .AddAzureBlobImageSharpCache() // This configures the required services for the Image Sharp cache
    .Build();

Upgrading from Umbraco 9/10:

Therefore, if you're planning on upgrading your site from Umbraco 9/10 to 11+, don't forget to install and setup the new Umbraco.StorageProviders.AzureBlob.ImageSharp package. This will ensure that your ImageSharp cache continues to be stored in your blob storage container.

Now when you launch your site again, the blob storage will be used to store media items as well as the ImageSharp cache. Do note though that the /media and /cache folders do not get created until a piece of media is uploaded.

Existing Media files

Any media files you already have on your site will not automatically be added to the blob storage container. You will need to copy the contents on the /wwwroot/media folder and upload them to a new folder called /media in your blob storage container. Once you've done that, you can safely delete the wwwroot/media folder locally, as it is no longer needed.

Any new media files you upload to the site will automatically be added to the Blob Storage.

Learn more about invoking and registering extension methods in the article.

As of of Umbraco.StorageProviders, the ImageSharp dependency has been separated into its own package.

Microsoft documentation
readme
Dependency Injection
version 11.0.0