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

# Adding function environment variables

When adding environment variables, you create a new version of the function. You cannot add variables to an existing version.

{% list tabs group=instructions %}

- Management console {#console}
    
    1. In the [management console](https://console.yandex.cloud), navigate to the folder containing the function.
    1. Navigate to **Cloud Functions**.
    1. Select the function whose version you want to add an environment variable to.
    1. Navigate to the **Editor** tab.
    1. Under **Parameters**, specify the environment variable and click **Add**. You can add multiple environment variables.
    1. Click **Save changes**. This will create a new function version with the specified environment variables.
    
- 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 add environment variables, run this command:

    {% note warning %}

    If the previous version contains environment variables, they will be overwritten.

    {% endnote %}

    ```bash
    yc serverless function version create \
      --function-name=<function_name> \
      --runtime <runtime_environment> \
      --entrypoint <entry_point> \
      --memory 128m \
      --execution-timeout 5s \
      --source-version-id <version_ID> \
      --environment <environment_variables>
    ```

    Where:

    * `--function-name`: Function name.
    * `--runtime`: Runtime.
    * `--entrypoint`: Entry point in `<function_file_name>.<handler_name>` format.
    * `--memory`: Amount of RAM.
    * `--execution-timeout`: Maximum function execution time before timeout.
    * `--source-version-id`: ID of the function version from which you want to copy the code.
    * `--environment`: Environment variables in `key=value` format. You can specify multiple pairs separated by commas.

- 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.

    To add environment variables:

    1. In the configuration file, add the `environment` section for the `yandex_function` resource and specify the list of environment variables in `<key> = "<value>"` format.

       Example of a function description in the Terraform configuration:
      
        ```hcl
        resource "yandex_function" "test-function" {
            name               = "test-function"
            description        = "Test function"
            user_hash          = "first-function"
            runtime            = "python37"
            entrypoint         = "main"
            memory             = "128"
            execution_timeout  = "10"
            service_account_id = "<service_account_ID>"
            tags               = ["my_tag"]
            environment = {
                <environment_variable_key> = "<environment_variable_value>"
            }
            content {
                zip_filename = "<path_to_ZIP_archive>"
            }
        }
        ```

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

    1. Validate your configuration using this command:
        
       ```bash
       terraform validate
       ```

       If the configuration is valid, you will get this message:
        
       ```text
       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. Confirm the changes: type `yes` into the terminal and press **Enter**.
      
    You can check the new environment variables in the [management console](https://console.yandex.cloud).

- API {#api}

    To add environment variables, use the [createVersion](../../functions/api-ref/Function/createVersion.md) REST API method for the [Function](../../functions/api-ref/Function/index.md) resource or the [FunctionService/CreateVersion](../../functions/api-ref/grpc/Function/createVersion.md) gRPC API call.


{% endlist %}


## See also

* [Environment variables](../../concepts/runtime/environment-variables.md#env)