Create an Azure Function with Core Tools

To create an Azure Function with Core Tools, you'll need to install the Azure Functions Core Tools. This can be done using npm by running the command `npm install -g azure-functions-core-tools@3`.

The Core Tools are a command-line interface that allows you to create, test, and deploy Azure Functions. You can use them to create a new Azure Function by running the command `func new --language csharp --template "HTTP trigger"`. This will create a new Azure Function project with a basic HTTP trigger.

Azure Functions supports several languages, including C#, F#, and JavaScript. To create a new Azure Function using a different language, you can use the `--language` option with the `func new` command. For example, to create a new Azure Function in JavaScript, you would run the command `func new --language javascript --template "HTTP trigger"`.

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To create an Azure function, you'll need to have Visual Studio Code installed on a supported platform.

You'll also need to install the Azure Functions extension, which you can do from the Extensions Marketplace in Visual Studio Code.

Make sure you have an active Azure subscription, or create one from the extension in Visual Studio Code if you don't already have an account.

The Azure Functions Core Tools are required for local debugging, which can be installed or updated by running a command from the command palette.

Here's a summary of the prerequisites:

Additionally, you'll need to install the C# extension for Visual Studio Code, .NET (CLI), and the Debugger for Java extension.

To create an Azure Function, you'll need to have an Azure account. Azure Functions are event-driven, which means they can be triggered by various events such as HTTP requests, timer triggers, or messages from queues or topics.

Azure Functions can be written in various languages, including C#, F#, Node.js, Python, and Java. These languages are used to define the function code, which is essentially a small piece of code that performs a specific task.

The Azure Functions runtime is responsible for executing the function code and managing the execution environment. This includes handling the function's dependencies, such as libraries and frameworks, and providing a secure environment for the function to run in.

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To set up an Azure Function, you'll need to have an active Azure subscription. This is the foundation of your Azure setup, and without it, you won't be able to create or manage your Azure Functions.

You'll also need to have PowerShell 7.0 installed on your machine. This will give you the necessary tools to interact with Azure and manage your Azure Functions.

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To install the Azure Functions Core Tools, you'll need to choose the right installer based on your operating system. For Windows, you can use the MSI installer, which is available for both 64-bit and 32-bit versions.

The recommended installer for Windows is the 64-bit version, as it's required for Visual Studio Code debugging. If you're using a 32-bit version, you can still install the 64-bit version, but you'll need to uninstall the old version first.

On macOS, you'll need to install Homebrew if it's not already installed, and then run the command "brew tap azure/functions" followed by "brew install azure-functions-core-tools@4". If you're upgrading from an older version, you'll also need to run "brew link --overwrite azure-functions-core-tools@4".

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For Linux, you'll need to use APT to install the Core Tools. The command to run is "apt-get install azure-functions-core-tools-4", but this must be done in a virtual environment.

Here are the specific installers you can use for each operating system:

macOS:

Linux (Ubuntu/Debian):

To download application settings from Azure, use the command "func azure functionapp fetch-app-settings" in your project root. This command will overwrite any existing settings in the local.settings.json file with values from Azure.

The local.settings.json file should mirror the application settings in your function app in Azure. If you add settings to the local file, you must also add them to the function app in Azure.

You can download settings from Azure using the Azure Functions: Download Remote Settings command. This command will update your local.settings.json file with the latest settings from Azure.

If your local file is encrypted, the command will decrypt it, update the settings, and then re-encrypt it again. If there are conflicting values, you'll be prompted to choose how to proceed.

Consider encrypting your local.settings.json file for improved security during development.

You should also monitor the execution of your functions by integrating your function app with Application Insights. This integration occurs by default when you create a function app in the Azure portal.

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To create an Azure function, you'll need to configure your environment first. You'll need an Azure account with an active subscription, which you can create for free.

You'll also need to install the .NET 8.0 SDK, which is required for Azure Functions. Additionally, you'll need Visual Studio Code on one of the supported platforms, along with the C# extension and the Azure Functions extension.

Here's a summary of the requirements:

With these tools in place, you're ready to start creating your Azure function.

To create an Azure function, you can add a new function to an existing project based on one of the predefined Functions trigger templates.

Select F1 to open the command palette, and then find and run the command Azure Functions: Create Function to start the process. Follow the prompts to choose your trigger type and define the required attributes of the trigger.

If your trigger requires an access key or connection string to connect to a service, get that item ready before you create the function trigger. This will save you time and effort in the long run.

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Visual Studio Code creates a new folder in the project when you add a new function trigger. This folder contains a new function.json file and the new code file for your chosen programming language.

The type of code file created depends on the language you select. For C# and JavaScript, you'll get a .cs file and a JavaScript code file respectively. For Python, you'll get a function_app.py file or another Python file you selected.

To define the output binding, you need to consider the version of your Node.js or Python model. The way you define it depends on the version, so make sure to check the documentation for more information.

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Function deployment is a critical step in creating an Azure function. You can deploy your project files to a function app in Azure using the func azure functionapp publish command.

This command publishes project files from the current directory to the function app as a .zip deployment package. If the project requires compilation, it's done remotely during deployment.

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You must have already created a function app in your Azure subscription to deploy your project files. Core Tools deploys your project code to this function app resource.

Here are the different deployment types supported by Azure Functions Core Tools:

You can also deploy your project files from Visual Studio Code by using the Azure Functions: Deploy to Function App command.

Publish to Azure is a crucial step in deploying your function project. You can deploy project files directly to your function app using zip deployment.

To deploy project files, use the `func azure functionapp publish` command. This command publishes project files from the current directory to the function app as a .zip deployment package. If the project requires compilation, it's done remotely during deployment.

You must have already created a function app in your Azure subscription to deploy project files. You can create a function app from the command prompt or terminal window using the Azure CLI or Azure PowerShell.

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Publishing overwrites existing files in the remote function app deployment. Be aware that this might cause data loss if you have existing files in the function app.

To avoid this issue, make sure to exclude items that shouldn't be published from your project folder. You can do this by listing them in a .funcignore file in the root project folder.

You can also use the `--nozip` option to disable the recommended deployment mode, which runs your project from the deployment package.

Here are the three types of deployment supported by Azure Functions Core Tools:

You must have either the Azure CLI or Azure PowerShell installed locally to be able to publish to Azure from Core Tools. If you don't have these tools installed, you need to get a valid access token to use during deployment.

To deploy your function app in Azure, you'll need to use the Azure Functions Core Tools, which support three types of deployment: project files, Azure Container Apps, and Kubernetes cluster.

You can deploy project files directly to your function app using the `func azure functionapp publish` command, which creates a zip deployment package and publishes it to the function app.

The Azure Functions Core Tools use the Azure CLI or Azure PowerShell to authenticate with your Azure account, so make sure you have one of these tools installed locally.

You can also use the `func azure functionapp publish` command with the `--nozip` option to disable the recommended deployment mode and deploy your project files without creating a zip package.

If you're using Java, you'll need to use Maven to publish your project to Azure, using the `mvn azure-functions:deploy` command.

To publish your project files, you'll need to have already created a function app in your Azure subscription, and you can use the `--slot` option to publish to a specific named slot in your function app.

Here are the different deployment types supported by the Azure Functions Core Tools:

You can also use the `func azure functionapp publish` command with the `--access-token` option to present an access token during deployment if you don't have the Azure CLI or Azure PowerShell installed locally.

To publish settings to your function app in Azure, you can use the `Upload settings` link that appears after you publish your project, or use the `Azure Functions: Upload Local Setting` command in the command palette.

You can also use the `Azure Functions: Add New Setting` command to add individual settings to application settings in Azure.

If you're publishing your project files without using the `--publish-local-settings` option, settings in the `local.settings.json` file won't be set in your function app, and you can rerun the `func azure functionapp publish` command with the `--publish-settings-only` option to upload just the settings without republishing the project files.

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To start the Functions runtime, you need to start the Functions host from the root directory of your project. This enables triggers for all functions in the project. Use the command `func start` to start the local runtime.

Starting with version 4.0.6517 of the Core Tools, in-process model projects must reference version 4.5.0 or later of Microsoft.NET.Sdk.Functions. If an earlier version is used, the `func start` command will error.

The Functions host outputs a list of functions in the project, including the URLs of any HTTP-triggered functions. By default, authorization isn't enforced locally for HTTP endpoints, so all local HTTP requests are handled as `authLevel = "anonymous"`.

You can use the `--enableAuth` option to require authorization when running locally.

Here are some additional details to keep in mind:

Function management is crucial to ensure your Azure Function runs smoothly.

You can manage your Azure Function through the Azure portal or using the Azure CLI.

For example, you can use the Azure CLI to update the configuration of your Function, such as changing the runtime version or adding new bindings.

To do this, you'll need to use the Azure Functions CLI commands, such as `func host start` to start the Function host, or `func host stop` to stop it.

Remember to use these commands in the correct order to avoid any errors.

In many organizations, functions are created without a clear purpose or scope, leading to a jumbled mess of overlapping and redundant tasks.

Functions should be simple and focused on a single goal, with clear responsibilities and expectations.

A well-defined function should have a clear purpose statement, outlining its main objective and key performance indicators.

To remove a function, you can right-click (Windows) or Ctrl-click (macOS) the function in the Azure: Functions area and select Delete. This will remove the function from your project.

If you're running functions locally, you can stop the function by pressing Ctrl + C to stop Core Tools and disconnect the debugger.

To remove a function app, you'll need to delete the function app in Azure. To do this, go to the Azure portal, find your function app, and select Delete.

You can also use the Azure Functions extension to delete a function app from Visual Studio Code. To do this, go to the command palette, enter Azure Functions: Delete function app, and select your function app.

If you're having trouble deleting a function app, make sure you're signed in to the correct subscription.

Here's a step-by-step guide to deleting a function app:

Note: Deleting a function app will also delete all of its functions and settings.