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We have multiple Umbraco sites that we need to migrate from an on-premise to Azure web apps.

Each site has its own /media/ folder and as all the images require a big storage space (~2gb) and many read/write operations, we thought of using an Azure Storage Account via Blob containers solution for this.

Is it correct to say that using a single Azure Storage Account to serve all the sites' /media folders via Blob containers will cut costs rather than using separate storage accounts for every site?

We've found the UmbracoFileSystemProviders.Azure package which is great, but can't find any details on how to achieve what's stated in the title of this post.

Question: How can we set up multiple /media/ blob containers within the same Azure Storage account to serve the images of multiple Umbraco sites?

You can indeed use the one Azure Storage Account; just set up different blob containers for each website - they actually don't need to be called "media". for example, I've set the containerName to Site1Media in the following example:

  <Provider alias="media" type="Our.Umbraco.FileSystemProviders.Azure.AzureBlobFileSystem, Our.Umbraco.FileSystemProviders.Azure">

<Parameters>

    <add key="containerName" value="Site1Media"/>

    <add key="rootUrl" value="https://youritteam.blob.core.windows.net/"/>

    <add key="connectionString" value="DefaultEndpointsProtocol=https;AccountName=[Account];AccountKey=[Key]"/>

    <!--

    Optional configuration value determining the maximum number of days to cache items in the browser.

    Defaults to 365 days.

  -->

    <add key="maxDays" value="365"/>

    <!--

    When true this allows the VirtualPathProvider to use the deafult "media" route prefix regardless 

    of the container name.

  -->

    <add key="useDefaultRoute" value="true"/>

    <!--

    When true blob containers will be private instead of public what means that you can't access the original blob file directly from its blob url.

  -->

    <add key="usePrivateContainer" value="false"/>

</Parameters>

The other thing about Azure Storage is that you only pay for the data you use; so it's not going to cost you extra to set up multiple Storage Accounts - there's probably very little benefit in having one Storage Account for multiple websites; and you may find it much easier later on to have one Storage Account per website - particularly if you want to move the website to another subscription down the track.