[Yandex Cloud documentation](../../../index.md) > [Yandex IoT Core](../../index.md) > [Step-by-step guides](../index.md) > Managing certificates > Managing device certificates

# Managing device certificates

{% 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 %}

For devices and registries to begin exchanging data and commands, you need to [log in](../../concepts/authorization.md). This section describes how to manage device certificates for the relevant authorization method.

{% note info %}

When using an X.509 certificate along with a password, the password has higher priority.

{% endnote %}

* [Viewing a list of device certificates](device-certificates.md#list-cert)
* [Adding a certificate to a device](device-certificates.md#add-cert)
* [Deleting a device certificate](device-certificates.md#delete-cert)

To access a [device](../../concepts/index.md#device), use its unique ID or name. For information about how to get its unique ID or name, see [Getting information about devices](../device/device-list.md)

## Getting a list of certificates {#device-certificates-list}

{% list tabs group=instructions %}

- Management console {#console}

   1. In the [management console](https://console.yandex.cloud), select the folder where the device is located.
   1. Navigate to **IoT Core**.
   1. Select the registry where the device is located.
   1. Navigate to the **Devices** tab.
   1. Select the device.
   1. On the **Overview** page, go to the **Certificates** section.

- 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.

  View the list of device certificates:

  ```bash
  yc iot device certificate list --device-name my-device
  ```

  Result:

  ```text
  +------------------------------------------+---------------------+
  |               FINGERPRINT                |     CREATED AT      |
  +------------------------------------------+---------------------+
  | df3cc4f337eba01a264803d15b119e2d******** | 2019-05-29 17:14:36 |
  | 65e5b050069da5ca5996a4a8a9251409******** | 2019-05-29 17:14:18 |
  +------------------------------------------+---------------------+
  ```

- API {#api}

  To get a list of device certificates, use the [listCertificates](../../api-ref/Device/listCertificates.md) REST API method for the [Device](../../api-ref/Device/index.md) resource or the [DeviceService/ListCertificates](../../api-ref/grpc/Device/listCertificates.md) gRPC API call.

{% endlist %}

## Adding a certificate {#add-cert}

{% list tabs group=instructions %}

- Management console {#console}

   To add a device certificate:

   1. In the [management console](https://console.yandex.cloud), select the folder to add the device certificate to.
   1. Navigate to **IoT Core**.
   1. Click the name of the registry.
   1. Navigate to **Devices**.
   1. Select the device from the list.
   1. On the **Overview** page, go to the **Certificates** section and click **Add certificate**.

      - To add a file:

         1. Select the `File` method.
         1. Click **Attach file**.
         1. Specify the certificate file on your computer and click **Open**.
         1. Click **Add**.

      - To add text:

         1. Select the `Text` method.
         1. Insert the certificate body in the **Content** field.
         1. Click **Add**.

- CLI {#cli}

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

  Add a certificate to the device:

  ```bash
  yc iot device certificate add \
    --device-name my-device \ # Device name.
    --certificate-file device-cert.pem # Path to the public part of the certificate.
  ```

  Result:
  ```text
  device_id: b9135goeh1uc********
  fingerprint: 65e5b050069da5ca5996a4a8a9251409********
  certificate_data: |
    -----BEGIN CERTIFICATE-----
    MIIE/jCCAuagAwI...
    -----END CERTIFICATE-----
  created_at: "2019-05-29T17:14:18.804Z"
  ```

- 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 add a certificate to a device created using Terraform:
  
  1. In the configuration file, describe the resources you want to create:

     * `yandex_iot_core_device`: Device properties:
       * `registry_id`: [ID of the registry](../registry/registry-list.md#registry-list) where the device will be created.
       * `name`: [Device name](../device/device-list.md#device-list).
       * `description`: Device description.
       * `certificates`: List of certificates for authentication with [certificates](../../concepts/authorization.md#certs).

      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"
      ...
        certificates = [
          file("<path_to_certificate_file>")
        ]
      ...
      }
      ```

      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 certificates in the [management console](https://console.yandex.cloud) or using this [CLI](../../../cli/quickstart.md) command:

      ```bash
      yc iot device certificate list --device-name <device_name>
      ```

- API {#api}

  To add a certificate to a device, use the [addCertificate](../../api-ref/Device/addCertificate.md) REST API method for the [Device](../../api-ref/Device/index.md) resource or the [DeviceService/AddCertificate](../../api-ref/grpc/Device/addCertificate.md) gRPC API call.

{% endlist %}

## Deleting a certificate {#delete-cert}

{% list tabs group=instructions %}

- Management console {#console}

   To delete a device certificate:

   1. In the [management console](https://console.yandex.cloud), select the folder to delete the device certificate from.
   1. Navigate to **IoT Core**.
   1. Click the name of the registry.
   1. Navigate to **Devices**.
   1. Select the device from the list.
   1. On the **Overview** page, go to the **Certificates** section.
   1. In the line with the certificate, click ![image](../../../_assets/console-icons/ellipsis.svg) and select **Delete** from the drop-down list.
   1. In the window that opens, click **Delete**.

- CLI {#cli}

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

  1. Delete a device certificate:

      ```bash
      yc iot device certificate delete --device-name my-device --fingerprint 65...
      ```

  1. Make sure the certificate was deleted:

      ```bash
      yc iot device certificate list --device-name my-device
	    ```

	    Result:
	  
	    ```text
      +-------------+------------+
      | FINGERPRINT | CREATED AT |
      +-------------+------------+
      +-------------+------------+
      ```

- 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 delete the certificate of a device created using Terraform:
  
  1. Open the Terraform configuration file and delete the certificate value in the `certificates` section, in the device description fragment. To remove all certificates, delete the entire `certificates` section.

      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"
      ...
        certificates = [
          file("<path_to_certificate_file>")
        ]
      ...
      }
      ```

      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 certificates in the [management console](https://console.yandex.cloud) or using this [CLI](../../../cli/quickstart.md) command:

      ```bash
      yc iot device certificate list --device-name <device_name>
      ```

- API {#api}

  To delete a device certificate, use the [deleteCertificate](../../api-ref/Device/deleteCertificate.md) REST API method for the [Device](../../api-ref/Device/index.md) resource or the [DeviceService/DeleteCertificate](../../api-ref/grpc/Device/deleteCertificate.md) gRPC API call.

{% endlist %}