[Yandex Cloud documentation](../../../index.md) > [Yandex Cloud Functions](../../index.md) > [Step-by-step guides](../index.md) > Creating a function > Creating a function

# Creating a function

{% list tabs group=instructions %}

- Management console {#console}

    1. In the [management console](https://console.yandex.cloud), select the folder where you want to create a function.
    1. Navigate to **Cloud Functions**.
    1. Click **Create function**.
    1. Enter a name and description for the function. The name format is as follows:

        * Length: between 3 and 63 characters.
        * It can only contain lowercase Latin letters, numbers, and hyphens.
        * It must start with a letter and cannot end with a hyphen.

    1. Click **Create**.

- CLI {#cli}

    If you do not have the Yandex Cloud CLI yet, [install and initialize it](../../../cli/quickstart.md#install).

    The folder used by default is the one specified when [creating](../../../cli/operations/profile/profile-create.md) the CLI profile. To change the default folder, use the `yc config set folder-id <folder_ID>` command. You can also specify a different folder for any command using `--folder-name` or `--folder-id`. If you access a resource by its name, the search will be limited to the default folder. If you access a resource by its ID, the search will be global, i.e., through all folders based on access permissions.

    To create a function, run this command:

    ```bash
    yc serverless function create --name=<function_name>
    ```

    Result:

    ```text
    id: b09bhaokchn9********
    folder_id: aoek49ghmknn********
    created_at: "2019-06-14T10:03:37.475Z"
    name: python_function
    log_group_id: eolm8aoq9vcp********
    http_invoke_url: https://functions.yandexcloud.net/b09bhaokchn9********
    status: ACTIVE
    ```

- Terraform {#tf}

    With [Terraform](https://www.terraform.io/), you can quickly create a cloud infrastructure in Yandex Cloud and manage it using configuration files. These files store the infrastructure description written in HashiCorp Configuration Language (HCL). If you change the configuration files, Terraform automatically detects which part of your configuration is already deployed, and what should be added or removed.
    
    Terraform is distributed under the [Business Source License](https://github.com/hashicorp/terraform/blob/main/LICENSE). The [Yandex Cloud provider for Terraform](https://github.com/yandex-cloud/terraform-provider-yandex) is distributed under the [MPL-2.0](https://www.mozilla.org/en-US/MPL/2.0/) license.
    
    For more information about the provider resources, see the relevant documentation on the [Terraform](https://www.terraform.io/docs/providers/yandex/index.html) website or [its mirror](../../../terraform/index.md).

    If you do not have Terraform yet, [install it and configure the Yandex Cloud provider](../../../tutorials/infrastructure-management/terraform-quickstart.md#install-terraform).
    
    
    To manage infrastructure using Terraform under a service account or user accounts (a Yandex account, a federated account, or a local user), [authenticate](../../../terraform/authentication.md) using the appropriate method.

    1. In the Terraform configuration file, describe the resources you want to create:

        ```hcl
        resource "yandex_function" "my-function" {
          name       = "<function_name>"
          user_hash  = "<function_version_hash>"
          runtime    = "<runtime>"
          entrypoint = "<entry_point>"
          memory     = "<memory_size>"
          content {
            zip_filename = "<path_to_ZIP_archive>"
          }
        }
        ```

        Where:

        * `name`: Function name.
        * `user_hash`: Any string to identify the function version. When you change the function, update this string as well. Updating this string triggers a function update.
        * `runtime`: Function [runtime](../../concepts/runtime/index.md).
        * `entrypoint`: Function name in the source code that will serve as an entry point to applications.
        * `memory`: Amount of memory allocated for the function, in MB.
        * `content`: Function source code:
            * `zip_filename`: Path to the ZIP archive containing the function source code and relevant dependencies.

        For more information about `yandex_function` properties, see [this provider guide](../../../terraform/resources/function.md).

    1. Create the resources:

        1. In the terminal, navigate to the configuration file directory.
        1. Make sure the configuration is correct using this command:
        
           ```bash
           terraform validate
           ```
        
           If the configuration is valid, you will get this message:
        
           ```bash
           Success! The configuration is valid.
           ```
        
        1. Run this command:
        
           ```bash
           terraform plan
           ```
        
           You will see a list of resources and their properties. No changes will be made at this step. Terraform will show any errors in the configuration.
        1. Apply the configuration changes:
        
           ```bash
           terraform apply
           ```
        
        1. Type `yes` and press **Enter** to confirm the changes.

        Terraform will create all the required resources. You can check the new resources using the [management console](https://console.yandex.cloud) or this [CLI](../../../cli/index.md) command:

        ```bash
        yc serverless function list
        ```

- API {#api}

    To create a function, use the [create](../../functions/api-ref/Function/create.md) REST API method for the [Function](../../functions/api-ref/Function/index.md) resource or the [FunctionService/Create](../../functions/api-ref/grpc/Function/create.md) gRPC API call.


{% endlist %}