Azure Functions Core Tools reference

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This article provides reference documentation for the Azure Functions Core Tools, which lets you develop, manage, and deploy Azure Functions projects from your local computer. To learn more about using Core Tools, see Work with Azure Functions Core Tools.

Core Tools commands are organized into the following contexts, each providing a unique set of actions.

Command context Description
func Commands used to create and run functions on your local computer.
func azure Commands for working with Azure resources, including publishing.
func azurecontainerapps Deploy containerized function app to Azure Container Apps.
func durable Commands for working with Durable Functions.
func extensions Commands for installing and managing extensions.
func kubernetes Commands for working with Kubernetes and Azure Functions.
func settings Commands for managing environment settings for the local Functions host.
func templates Commands for listing available function templates.

Before using the commands in this article, you must install the Core Tools.

func init

Creates a new Functions project in a specific language.

func init <PROJECT_FOLDER>

When you supply <PROJECT_FOLDER>, the project is created in a new folder with this name. Otherwise, the current folder is used.

func init supports the following options, which don't support version 1.x unless otherwise noted:

Option Description
--csx Creates .NET functions as C# script, which is the version 1.x behavior. Valid only with --worker-runtime dotnet.
--docker Creates a Dockerfile for a container using a base image that is based on the chosen --worker-runtime. Use this option when you plan to deploy a containerized function app.
--docker-only Adds a Dockerfile to an existing project. Prompts for the worker-runtime if not specified or set in local.settings.json. Use this option when you plan to deploy a containerized function app and the project already exists.
--force Initialize the project even when there are existing files in the project. This setting overwrites existing files with the same name. Other files in the project folder aren't affected.
--language Initializes a language-specific project. Currently supported when --worker-runtime set to node. Options are typescript and javascript. You can also use --worker-runtime javascript or --worker-runtime typescript.
--managed-dependencies Installs managed dependencies. Currently, only the PowerShell worker runtime supports this functionality.
--model Sets the desired programming model for a target language when more than one model is available. Supported options are V1 and V2 for Python and V3 and V4 for Node.js. For more information, see the Python developer guide and the Node.js developer guide, respectively.
--source-control Controls whether a git repository is created. By default, a repository isn't created. When true, a repository is created.
--worker-runtime Sets the language runtime for the project. Supported values are: csharp, dotnet, dotnet-isolated, javascript,node (JavaScript), powershell, python, and typescript. For Java, use Maven. To generate a language-agnostic project with just the project files, use custom. When not set, you're prompted to choose your runtime during initialization.
--target-framework Sets the target framework for the function app project. Valid only with --worker-runtime dotnet-isolated. Supported values are: net9.0 (preview), net8.0 (default), net6.0, and net48 (.NET Framework 4.8).

Note

When you use either --docker or --docker-only options, Core Tools automatically create the Dockerfile for C#, JavaScript, Python, and PowerShell functions. For Java functions, you must manually create the Dockerfile. For more information, see Creating containerized function apps.

func logs

Gets logs for functions running in a Kubernetes cluster.

func logs --platform kubernetes --name <APP_NAME>

The func logs action supports the following options:

Option Description
--platform Hosting platform for the function app. Supported options: kubernetes.
--name Function app name in Azure.

To learn more, see Azure Functions on Kubernetes with KEDA.

func new

Creates a new function in the current project based on a template.

func new

When you run func new without the --template option, you're prompted to choose a template. In version 1.x, you're also required to choose the language.

The func new action supports the following options:

Option Description
--authlevel Lets you set the authorization level for an HTTP trigger. Supported values are: function, anonymous, admin. Authorization isn't enforced when running locally. For more information, see Authorization level.
--csx (Version 2.x and later versions.) Generates the same C# script (.csx) templates used in version 1.x and in the portal.
--language, -l The template programming language, such as C#, F#, or JavaScript. This option is required in version 1.x. In version 2.x and later versions, you don't use this option because the language is defined by the worker runtime.
--name, -n The function name.
--template, -t Use the func templates list command to see the complete list of available templates for each supported language.

To learn more, see Create a function.

func run

Version 1.x only.

Enables you to invoke a function directly, which is similar to running a function using the Test tab in the Azure portal. This action is only supported in version 1.x. For later versions, use func start and call the function endpoint directly.

func run

The func run action supports the following options:

Option Description
--content Inline content passed to the function.
--debug Attach a debugger to the host process before running the function.
--file The file name to use as content.
--no-interactive Doesn't prompt for input, which is useful for automation scenarios.
--timeout Time to wait (in seconds) until the local Functions host is ready.

For example, to call an HTTP-triggered function and pass content body, run the following command:

func run MyHttpTrigger --content '{\"name\": \"Azure\"}'

func start

Starts the local runtime host and loads the function project in the current folder.

The specific command depends on the runtime version.

func start

func start supports the following options:

Option Description
--cert The path to a .pfx file that contains a private key. Only supported with --useHttps.
--cors A comma-separated list of CORS origins, with no spaces.
--cors-credentials Allow cross-origin authenticated requests using cookies and the Authentication header.
--dotnet-isolated-debug When set to true, pauses the .NET worker process until a debugger is attached from the .NET isolated project being debugged.
--enable-json-output Emits console logs as JSON, when possible.
--enableAuth Enable full authentication handling pipeline, with authorization requirements.
--functions A space-separated list of functions to load.
--language-worker Arguments to configure the language worker. For example, you can enable debugging for language worker by providing debug port and other required arguments.
--no-build Don't build the current project before running. For .NET class projects only. The default is false.
--password Either the password or a file that contains the password for a .pfx file. Only used with --cert.
--port The local port to listen on. Default value: 7071.
--timeout The timeout for the Functions host to start, in seconds. Default: 20 seconds.
--useHttps Bind to https://localhost:{port} rather than to http://localhost:{port}. By default, this option creates a trusted certificate on your computer.

With the project running, you can verify individual function endpoints.

func azure functionapp fetch-app-settings

Gets settings from a specific function app.

func azure functionapp fetch-app-settings <APP_NAME>

For more information, see Download application settings.

Settings are downloaded into the local.settings.json file for the project. On-screen values are masked for security. You can protect settings in the local.settings.json file by enabling local encryption.

func azure functionapp list-functions

Returns a list of the functions in the specified function app.

func azure functionapp list-functions <APP_NAME>

func azure functionapp logstream

Connects the local command prompt to streaming logs for the function app in Azure.

func azure functionapp logstream <APP_NAME>

The default timeout for the connection is 2 hours. You can change the timeout by adding an app setting named SCM_LOGSTREAM_TIMEOUT, with a timeout value in seconds. Not yet supported for Linux apps in the Consumption plan. For these apps, use the --browser option to view logs in the portal.

The deploy action supports the following options:

Option Description
--browser Open Azure Application Insights Live Stream for the function app in the default browser.

For more information, see Enable streaming execution logs in Azure Functions.

func azure functionapp publish

Deploys a Functions project to an existing function app resource in Azure.

func azure functionapp publish <APP_NAME>

For more information, see Deploy project files.

The following publish options apply, based on version:

Option Description
--access-token Lets you use a specific access token when performing authenticated azure actions.
--access-token-stdin Reads a specific access token from a standard input. Use this when reading the token directly from a previous command such as az account get-access-token.
--additional-packages List of packages to install when building native dependencies. For example: python3-dev libevent-dev.
--build, -b Performs build action when deploying to a Linux function app. Accepts: remote and local.
--build-native-deps Skips generating the .wheels folder when publishing Python function apps.
--csx Publish a C# script (.csx) project.
--dotnet-cli-params When publishing compiled C# (.csproj) functions, the core tools calls dotnet build --output bin/publish. Any parameters passed to this are appended to the command line.
--force Ignore prepublishing verification in certain scenarios.
--list-ignored-files Displays a list of files that are ignored during publishing, which is based on the .funcignore file.
--list-included-files Displays a list of files that are published, which is based on the .funcignore file.
--management-url Sets the management URL for your cloud. Use this when running in a sovereign cloud.
--no-build Project isn't built during publishing. For Python, pip install isn't performed.
--nozip Turns the default Run-From-Package mode off.
--overwrite-settings -y Suppress the prompt to overwrite app settings when --publish-local-settings -i is used.
--publish-local-settings -i Publish settings in local.settings.json to Azure, prompting to overwrite if the setting already exists. If you're using a local storage emulator, first change the app setting to an actual storage connection.
--publish-settings-only, -o Only publish settings and skip the content. Default is prompt.
--slot Optional name of a specific slot to which to publish.
--subscription Sets the default subscription to use.

func azure storage fetch-connection-string

Gets the connection string for the specified Azure Storage account.

func azure storage fetch-connection-string <STORAGE_ACCOUNT_NAME>

For more information, see Download a storage connection string.

func azurecontainerapps deploy

Deploys a containerized function app to an Azure Container Apps environment. Both the storage account used by the function app and the environment must already exist.

func azurecontainerapps deploy --name <APP_NAME> --environment <ENVIRONMENT_NAME> --storage-account <STORAGE_CONNECTION> --resource-group <RESOURCE_GROUP> --image-name <IMAGE_NAME> --registry-server <REGISTRY_SERVER> --registry-username <USERNAME> --registry-password <PASSWORD>

The following deployment options apply:

Option Description
--access-token Lets you use a specific access token when performing authenticated azure actions.
--access-token-stdin Reads a specific access token from a standard input. Use this when reading the token directly from a previous command such as az account get-access-token.
--environment The name of an existing Container Apps environment.
--image-build When set to true, skips the local Docker build.
--image-name The image name of an existing container in a container registry. The image name includes the tag name.
--location Region for the deployment. Ideally, this is the same region as the environment and storage account resources.
--management-url Sets the management URL for your cloud. Use this when running in sovereign cloud.
--name The name used for the function app deployment in the Container Apps environment. This same name is also used when managing the function app in the portal. The name should be unique in the environment.
--registry When set, a Docker build is run and the image is pushed to the registry set in --registry. You can't use --registry with --image-name. For Docker Hub, also use --registry-username.
--registry-password The password or token used to retrieve the image from a private registry.
--registry-username The username used to retrieve the image from a private registry.
--resource-group The resource group in which to create the functions-related resources.
--storage-account The connection string for the storage account to be used by the function app.
--subscription Sets the default subscription to use.
--worker-runtime Sets the runtime language of the function app. This parameter is only used with --image-name and --image-build, otherwise the language is determined during the local build. Supported values are: dotnet, dotnetIsolated, node, python, powershell, and custom (for customer handlers).

Important

Storage connection strings and other service credentials are important secrets. Make sure to securely store any script files using func azurecontainerapps deploy and don't store them in any publicly accessible source control.

func deploy

The func deploy command is deprecated. Instead use func kubernetes deploy.

func durable delete-task-hub

Deletes all storage artifacts in the Durable Functions task hub.

func durable delete-task-hub

The delete-task-hub action supports the following options:

Option Description
--connection-string-setting Optional name of the setting containing the storage connection string to use.
--task-hub-name Optional name of the Durable Task Hub to use.

To learn more, see the Durable Functions documentation.

func durable get-history

Returns the history of the specified orchestration instance.

func durable get-history --id <INSTANCE_ID>

The get-history action supports the following options:

Option Description
--id Specifies the ID of an orchestration instance (required).
--connection-string-setting Optional name of the setting containing the storage connection string to use.
--task-hub-name Optional name of the Durable Task Hub to use.

To learn more, see the Durable Functions documentation.

func durable get-instances

Returns the status of all orchestration instances. Supports paging using the top parameter.

func durable get-instances

The get-instances action supports the following options:

Option Description
--continuation-token Optional token that indicates a specific page/section of the requests to return.
--connection-string-setting Optional name of the app setting that contains the storage connection string to use.
--created-after Optionally, get the instances created after this date/time (UTC). All ISO 8601 formatted datetimes are accepted.
--created-before Optionally, get the instances created before a specific date/time (UTC). All ISO 8601 formatted datetimes are accepted.
--runtime-status Optionally, get the instances whose status match a specific status, including running, completed, and failed. You can provide one or more space-separated statues.
--top Optionally limit the number of records returned in a given request.
--task-hub-name Optional name of the Durable Functions task hub to use.

To learn more, see the Durable Functions documentation.

func durable get-runtime-status

Returns the status of the specified orchestration instance.

func durable get-runtime-status --id <INSTANCE_ID>

The get-runtime-status action supports the following options:

Option Description
--connection-string-setting Optional name of the setting containing the storage connection string to use.
--id Specifies the ID of an orchestration instance (required).
--show-input When set, the response contains the input of the function.
--show-output When set, the response contains the execution history.
--task-hub-name Optional name of the Durable Functions task hub to use.

To learn more, see the Durable Functions documentation.

func durable purge-history

Purge orchestration instance state, history, and blob storage for orchestrations older than the specified threshold.

func durable purge-history

The purge-history action supports the following options:

Option Description
--connection-string-setting Optional name of the setting containing the storage connection string to use.
--created-after Optionally delete the history of instances created after this date/time (UTC). All ISO 8601 formatted datetime values are accepted.
--created-before Optionally delete the history of instances created before this date/time (UTC). All ISO 8601 formatted datetime values are accepted.
--runtime-status Optionally delete the history of instances whose status match a specific status, including completd, terminated, canceled, and failed. You can provide one or more space-separated statues. If you don't include --runtime-status, instance history is deleted regardless of status.
--task-hub-name Optional name of the Durable Functions task hub to use.

To learn more, see the Durable Functions documentation.

func durable raise-event

Raises an event to the specified orchestration instance.

func durable raise-event --event-name <EVENT_NAME> --event-data <DATA>

The raise-event action supports the following options:

Option Description
--connection-string-setting Optional name of the setting containing the storage connection string to use.
--event-data Data to pass to the event, either inline or from a JSON file (required). For files, prefix the path to the file with an ampersand (@), such as @path/to/file.json.
--event-name Name of the event to raise (required).
--id Specifies the ID of an orchestration instance (required).
--task-hub-name Optional name of the Durable Functions task hub to use.

To learn more, see the Durable Functions documentation.

func durable rewind

Rewinds the specified orchestration instance.

func durable rewind --id <INSTANCE_ID> --reason <REASON>

The rewind action supports the following options:

Option Description
--connection-string-setting Optional name of the setting containing the storage connection string to use.
--id Specifies the ID of an orchestration instance (required).
--reason Reason for rewinding the orchestration (required).
--task-hub-name Optional name of the Durable Functions task hub to use.

To learn more, see the Durable Functions documentation.

func durable start-new

Starts a new instance of the specified orchestrator function.

func durable start-new --id <INSTANCE_ID> --function-name <FUNCTION_NAME> --input <INPUT>

The start-new action supports the following options:

Option Description
--connection-string-setting Optional name of the setting containing the storage connection string to use.
--function-name Name of the orchestrator function to start (required).
--id Specifies the ID of an orchestration instance (required).
--input Input to the orchestrator function, either inline or from a JSON file (required). For files, prefix the path to the file with an ampersand (@), such as @path/to/file.json.
--task-hub-name Optional name of the Durable Functions task hub to use.

To learn more, see the Durable Functions documentation.

func durable terminate

Stops the specified orchestration instance.

func durable terminate --id <INSTANCE_ID> --reason <REASON>

The terminate action supports the following options:

Option Description
--connection-string-setting Optional name of the setting containing the storage connection string to use.
--id Specifies the ID of an orchestration instance (required).
--reason Reason for stopping the orchestration (required).
--task-hub-name Optional name of the Durable Functions task hub to use.

To learn more, see the Durable Functions documentation.

func extensions install

Manually installs Functions extensions in a non-.NET project or in a C# script project.

func extensions install --package Microsoft.Azure.WebJobs.Extensions.<EXTENSION> --version <VERSION>

The install action supports the following options:

Option Description
--configPath Path of the directory containing extensions.csproj file.
--csx Supports C# scripting (.csx) projects.
--force Update the versions of existing extensions.
--output Output path for the extensions.
--package Identifier for a specific extension package. When not specified, all referenced extensions are installed, as with func extensions sync.
--source NuGet feed source when not using NuGet.org.
--version Extension package version.

The following example installs version 5.0.1 of the Event Hubs extension in the local project:

func extensions install --package Microsoft.Azure.WebJobs.Extensions.EventHubs --version 5.0.1

The following considerations apply when using func extensions install:

  • For compiled C# projects (both in-process and isolated worker process), instead use standard NuGet package installation methods, such as dotnet add package.

  • To manually install extensions using Core Tools, you must have the .NET SDK installed.

  • When possible, you should instead use extension bundles. The following are some reasons why you might need to install extensions manually:

    • You need to access a specific version of an extension not available in a bundle.
    • You need to access a custom extension not available in a bundle.
    • You need to access a specific combination of extensions not available in a single bundle.

  • Before you can manually install extensions, you must first remove the extensionBundle object from the host.json file that defines the bundle. No action is taken when an extension bundle is already set in your host.json file.

  • The first time you explicitly install an extension, a .NET project file named extensions.csproj is added to the root of your app project. This file defines the set of NuGet packages required by your functions. While you can work with the NuGet package references in this file, Core Tools lets you install extensions without having to manually edit this C# project file.

func extensions sync

Installs all extensions added to the function app.

The sync action supports the following options:

Option Description
--configPath Path of the directory containing extensions.csproj file.
--csx Supports C# scripting (.csx) projects.
--output Output path for the extensions.

Regenerates a missing extensions.csproj file. No action is taken when an extension bundle is defined in your host.json file.

func kubernetes deploy

Deploys a Functions project as a custom docker container to a Kubernetes cluster.

func kubernetes deploy

This command builds your project as a custom container and publishes it to a Kubernetes cluster. Custom containers must have a Dockerfile. To create an app with a Dockerfile, use the --dockerfile option with the func init command.

The following Kubernetes deployment options are available:

Option Description
--dry-run Optionally displays the deployment template, without execution.
--config-map-name Optional name of an existing config map with function app settings to use in the deployment. Requires --use-config-map. The default behavior is to create settings based on the Values object in the local.settings.json file.
--cooldown-period The cool-down period (in seconds) after all triggers are no longer active before the deployment scales back down to zero, with a default of 300 s.
--ignore-errors Continues the deployment after a resource returns an error. The default behavior is to stop on error.
--image-name The name of the image to use for the pod deployment and from which to read functions.
--keda-version Sets the version of KEDA to install. Valid options are: v1 and v2 (default).
--keys-secret-name The name of a Kubernetes Secrets collection to use for storing access keys.
--max-replicas Sets the maximum replica count for to which the Horizontal Pod Autoscaler (HPA) scales.
--min-replicas Sets the minimum replica count below which HPA won't scale.
--mount-funckeys-as-containervolume Mounts the access keys as a container volume.
--name The name used for the deployment and other artifacts in Kubernetes.
--namespace Sets the Kubernetes namespace to which to deploy, which defaults to the default namespace.
--no-docker Functions are read from the current directory instead of from an image. Requires mounting the image filesystem.
--registry When set, a Docker build is run and the image is pushed to a registry of that name. You can't use --registry with --image-name. For Docker, use your username.
--polling-interval The polling interval (in seconds) for checking non-HTTP triggers, with a default of 30s.
--pull-secret The secret used to access private registry credentials.
--secret-name The name of an existing Kubernetes Secrets collection that contains function app settings to use in the deployment. The default behavior is to create settings based on the Values object in the local.settings.json file.
--show-service-fqdn Displays the URLs of HTTP triggers with the Kubernetes FQDN instead of the default behavior of using an IP address.
--service-type Sets the type of Kubernetes Service. Supported values are: ClusterIP, NodePort, and LoadBalancer (default).
--use-config-map Use a ConfigMap object (v1) instead of a Secret object (v1) to configure function app settings. The map name is set using --config-map-name.

Core Tools uses the local Docker CLI to build and publish the image. Make sure your Docker is already installed locally. Run the docker login command to connect to your account.

Azure Functions supports hosting your containerized functions in Azure Functions.

func kubernetes install

Installs KEDA in a Kubernetes cluster.

func kubernetes install

Installs KEDA to the cluster defined in the kubectl config file.

The install action supports the following options:

Option Description
--dry-run Displays the deployment template, without execution.
--keda-version Sets the version of KEDA to install. Valid options are: v1 and v2 (default).
--namespace Supports installation to a specific Kubernetes namespace. When not set, the default namespace is used.

To learn more, see Managing KEDA and functions in Kubernetes.

func kubernetes remove

Removes KEDA from the Kubernetes cluster defined in the kubectl config file.

func kubernetes remove

Removes KEDA from the cluster defined in the kubectl config file.

The remove action supports the following options:

Option Description
--namespace Supports uninstall from a specific Kubernetes namespace. When not set, the default namespace is used.

To learn more, see Uninstalling KEDA from Kubernetes.

func settings add

Adds a new setting to the Values collection in the local.settings.json file.

func settings add <SETTING_NAME> <VALUE>

Replace <SETTING_NAME> with the name of the app setting and <VALUE> with the value of the setting.

The add action supports the following option:

Option Description
--connectionString Adds the name-value pair to the ConnectionStrings collection instead of the Values collection. Only use the ConnectionStrings collection when required by certain frameworks. To learn more, see local.settings.json file.

func settings decrypt

Decrypts previously encrypted values in the Values collection in the local.settings.json file.

func settings decrypt

Connection string values in the ConnectionStrings collection are also decrypted. In local.settings.json, IsEncrypted is also set to false. Encrypt local settings to reduce the risk of leaking valuable information from local.settings.json. In Azure, application settings are always stored encrypted.

func settings delete

Removes an existing setting from the Values collection in the local.settings.json file.

func settings delete <SETTING_NAME>

Replace <SETTING_NAME> with the name of the app setting and <VALUE> with the value of the setting.

The delete action supports the following option:

Option Description
--connectionString Removes the name-value pair from the ConnectionStrings collection instead of from the Values collection.

func settings encrypt

Encrypts the values of individual items in the Values collection in the local.settings.json file.

func settings encrypt

Connection string values in the ConnectionStrings collection are also encrypted. In local.settings.json, IsEncrypted is also set to true, which specifies that the local runtime decrypts settings before using them. Encrypt local settings to reduce the risk of leaking valuable information from local.settings.json. In Azure, application settings are always stored encrypted.

func settings list

Outputs a list of settings in the Values collection in the local.settings.json file.

func settings list

Connection strings from the ConnectionStrings collection are also output. By default, values are masked for security. You can use the --showValue option to display the actual value.

The list action supports the following option:

Option Description
--showValue Shows the actual unmasked values in the output.

func templates list

Lists the available function (trigger) templates.

The list action supports the following option:

Option Description
--language Language for which to filter returned templates. Default is to return all languages.