Qme Emulator Service

[Octavis Marquez]

Aspart of our efforts to increase the available resources, thousands of computing environments are being configured and shared to the EaaSI Network service. Configuration workers are busy cataloging software (e.g., names, developers, system requirements, file format support) and installing operating systems and applications in emulated computing environments.

EaaSI draws on existing metadata schema and standard initiatives to address software and software dependencies (CodeMeta, PREMIS, Wikidata, and more) to power all components of our service. That means:

The Microsoft Azure Storage Emulator is a tool that emulates the Azure Blob, Queue, and Table services for local development purposes. You can test your application against the storage services locally without creating an Azure subscription or incurring any costs. When you're satisfied with how your application is working in the emulator, switch to using an Azure storage account in the cloud.

The Azure Storage Emulator is now deprecated. Microsoft recommends that you use the Azurite emulator for local development with Azure Storage. Azurite supersedes the Azure Storage Emulator. Azurite will continue to be updated to support the latest versions of Azure Storage APIs. For more information, see Use the Azurite emulator for local Azure Storage development.

The Storage Emulator is available as part of the Microsoft Azure SDK. You can also install the Storage Emulator by using the standalone installer (direct download). To install the Storage Emulator, you must have administrative privileges on your computer.

Data created in one version of the Storage Emulator is not guaranteed to be accessible when using a different version. If you need to persist your data for the long term, we recommended that you store that data in an Azure storage account, rather than in the Storage Emulator.

The Storage Emulator depends on specific versions of the OData libraries. Replacing the OData DLLs used by the Storage Emulator with other versions is unsupported, and may cause unexpected behavior. However, any version of OData supported by the storage service may be used to send requests to the emulator.

The Storage Emulator uses a local Microsoft SQL Server 2012 Express LocalDB instance to emulate Azure storage services. You can choose to configure the Storage Emulator to access a local instance of SQL Server instead of the LocalDB instance. See the Start and initialize the Storage Emulator section later in this article to learn more.

Some differences in functionality exist between the Storage Emulator and Azure storage services. For more information about these differences, see the Differences between the Storage Emulator and Azure Storage section later in this article.

When the Storage Emulator starts, a Command Prompt window will appear. You can use this console window to start and stop the Storage Emulator. You can also clear data, get status, and initialize the emulator from the command prompt. For more information, see the Storage Emulator command-line tool reference section later in this article.

When you close the Storage Emulator Command Prompt window, the Storage Emulator will continue to run. To bring up the Storage Emulator console window again, follow the preceding steps as if starting the Storage Emulator.

The first time you run the Storage Emulator, the local storage environment is initialized for you. The initialization process creates a database in LocalDB and reserves HTTP ports for each local storage service.

You can use the Microsoft Azure Storage Explorer to work with local Storage Emulator resources. Look for "(Emulator - Default Ports) (Key)" under "Local & Attached" in the Storage Explorer resources tree after you've installed and started the Storage Emulator.

You can use the Microsoft SQL Server Management Studio (SSMS) to manage your SQL Server instances, including the LocalDB installation. In the SMSS Connect to Server dialog, specify (localdb)\MSSQLLocalDb in the Server name: field to connect to the LocalDB instance.

Once you've installed and started the Storage Emulator, you can test your code against it. Every request you make against the Storage Emulator must be authorized, unless it's an anonymous request. You can authorize requests against the Storage Emulator using Shared Key authentication or with a shared access signature (SAS).

The emulator supports a single fixed account and a well-known authentication key for Shared Key authentication. This account and key are the only Shared Key credentials permitted for use with the emulator. They are:

The authentication key supported by the emulator is intended only for testing the functionality of your client authentication code. It does not serve any security purpose. You cannot use your production storage account and key with the emulator. You should not use the development account with production data.

The easiest way to connect to the emulator from your application is to configure a connection string in your application's configuration file that references the shortcut UseDevelopmentStorage=true. The shortcut is equivalent to the full connection string for the emulator, which specifies the account name, the account key, and the emulator endpoints for each of the Azure Storage services:

The following .NET code snippet shows how you can use the shortcut from a method that takes a connection string. For example, the BlobContainerClient(String, String) constructor takes a connection string.

We recommend that you use the Azure Az PowerShell module to interact with Azure. To get started, see Install Azure PowerShell. To learn how to migrate to the Az PowerShell module, see Migrate Azure PowerShell from AzureRM to Az.

Some Azure storage client libraries, such as the Xamarin library, only support authentication with a shared access signature (SAS) token. You can create the SAS token using Storage Explorer or another application that supports Shared Key authentication.

The service endpoints for the Storage Emulator are different from the endpoints for an Azure storage account. The local computer doesn't do domain name resolution, requiring the Storage Emulator endpoints to be local addresses.

Beginning with version 3.1, the Storage Emulator supports read-access geo-redundant replication (RA-GRS). You can access the secondary location by appending -secondary to the account name. For example, the following address might be used for accessing a blob using the read-only secondary in the Storage Emulator:

Starting in version 3.0, a console window is displayed when you start the Storage Emulator. Use the command line in the console window to start and stop the emulator. You can also query for status and do other operations from the command line.

If you have the Microsoft Azure Compute Emulator installed, a system tray icon appears when you launch the Storage Emulator. Right-click on the icon to reveal a menu that provides a graphical way to start and stop the Storage Emulator.

I've figured out what I was missing. After creating and mounting the service account in the emulator, you must also specify which service account is tied to the proxy in the deployments.json. This is described here.

The Azurite open-source emulator provides a free local environment for testing your Azure Blob, Queue Storage, and Table Storage applications. When you're satisfied with how your application is working locally, switch to using an Azure Storage account in the cloud. The emulator provides cross-platform support on Windows, Linux, and macOS.

Azurite is automatically available with Visual Studio 2022. The Azurite executable is updated as part of Visual Studio new version releases. If you're running an earlier version of Visual Studio, you can install Azurite by using either Node Package Manager (npm), DockerHub, or by cloning the Azurite GitHub repository.

This installation method requires that you have Node.js version 8.0 or later installed. Node Package Manager (npm) is the package management tool included with every Node.js installation. After installing Node.js, execute the following npm command to install Azurite.

To use Azurite with most project types in Visual Studio, you first need to run the Azurite executable. Once the executable is running, Azurite listens for connection requests from the application. To learn more, see Running Azurite from the command line.

For Azure Functions projects and ASP.NET projects, you can choose to configure the project to start Azurite automatically. This configuration is done during the project setup. While this project configuration starts Azurite automatically, Visual Studio doesn't expose detailed Azurite configuration options. To customize detailed Azurite configuration options, run the Azurite executable before launching Visual Studio.

After you create the project, Azurite starts automatically. The location of the Azurite executable file is detailed in the Azurite executable file location table. The output looks similar to the following screenshot:

When the configuration completes, select Close, and the Azurite emulator starts automatically. The location of the Azurite executable file is detailed in the Azurite executable file location table. The output looks similar to the following screenshot:

Azurite cannot be run from the command line if you only installed the Visual Studio Code extension. Instead, use the Visual Studio Code command palette to run commands. Configuration settings are detailed at Configure Azurite extension settings.

Optional - Azurite stores data to the local disk during execution. Use the -l or --location switch to specify a path as the workspace location. By default, the current process working directory is used. Note the lowercase 'l'.

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