[Yandex Cloud documentation](../../../../index.md) > [Yandex IoT Core](../../../index.md) > [Step-by-step guides](../../index.md) > Managing devices > Managing topic aliases > Updating an alias

# Updating an alias

{% note warning %}

Yandex IoT Core is no longer available to new users. 

Current users can create resources until November 1, 2026. Afterwards, the service will go read-only and cease to operate on December 1, 2026. For more information on the timing and procedure, see [Service shutdown](../../../sunset.md).

{% endnote %}

Aliases are linked to specific devices. To update an alias, you [need the device ID or name](../device-list.md).

{% list tabs group=instructions %}

- Management console {#console}

   To update an alias:

   1. In the [management console](https://console.yandex.cloud), select a folder in which to update an alias.
   1. Navigate to **IoT Core**.
   1. Select the required registry from the list.
   1. On the left side of the window, select the **Devices** section.
   1. Click ![image](../../../../_assets/console-icons/ellipsis.svg) to the right of the appropriate device name and select **Edit** from the drop-down list.
   1. Update the values of the alias fields.
   1. Click **Save**.

- 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.
    
    Update device aliases: 
    
    {% note warning %}
    
    The existing `topic_aliases` will be completely overwritten by the ones you provide in your request.
    
    {% endnote %}
    
    ```bash
    yc iot device update first --topic-aliases 'events=$devices/areqjd6un3af********/events,commands=$devices/areqjd6un3af********/commands'
    ```

    Result:
    ```text
    id: areqjd6un3af********
    registry_id: arenou2oj4ct********
    created_at: "2019-09-16T10:41:06.489Z"
    name: first
    topic_aliases:
      commands: $devices/areqjd6un3af********/commands
      events: $devices/areqjd6un3af********/events
    ```

- 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 guides 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 update an alias created with Terraform:
  
  1. Open the Terraform configuration file and edit the alias value in the `aliases` section, in the device description fragment.

      Example device description in the Terraform configuration:

      ```hcl
      resource "yandex_iot_core_device" "my_device" {
        registry_id = "<registry_ID>"
        name        = "<device_name>"
        description = "test device for terraform provider documentation"

        aliases = {
          "some-alias1/subtopic" = "$devices/{id}/events/somesubtopic",
          "some-alias2/subtopic" = "$devices/{id}/events/aaa/bbb",
        }
      ...
      }
      ```

      For more on the properties of the `yandex_iot_core_device` resource, see [this provider guide](../../../../terraform/resources/iot_core_device.md).
  1. In the command line, change to the folder where you edited the configuration file.
  1. Make sure the configuration file 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. Confirm the changes: type `yes` into the terminal and press **Enter**.

      You can verify device aliases in the [management console](https://console.yandex.cloud) or using the following [CLI](../../../../cli/quickstart.md) command:

      ```bash
      yc iot device get <device_name>
      ```

- API {#api}

  To update an alias, use the [update](../../../api-ref/Device/update.md) REST API method for the [Device](../../../api-ref/Device/index.md) resource or the [DeviceService/Update](../../../api-ref/grpc/Device/update.md) gRPC API call.

{% endlist %}