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

# Managing registry 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 registry certificates for the appropriate authorization method.

{% note info %}

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

{% endnote %}

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

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

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

{% list tabs group=instructions %}

- Management console {#console}

   1. In the [management console](https://console.yandex.cloud), select the folder where the registry is located.
   1. Navigate to **IoT Core**.
   1. Select the registry.
   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.

  Get a list of registry certificates:

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

  Result:

  ```text
  +------------------------------------------+---------------------+
  |               FINGERPRINT                |     CREATED AT      |
  +------------------------------------------+---------------------+
  | 0f511ea32139178edf73afb953a9cc39******** | 2019-05-29 16:46:23 |
  | 589ce1605019eeff7bb0992f290be0cd******** | 2019-05-29 16:40:48 |
  +------------------------------------------+---------------------+
  ```

- API {#api}

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

{% endlist %}

## Adding a certificate {#add-cert}

{% list tabs group=instructions %}

- Management console {#console}

   To add a certificate to a registry:

   1. In the [management console](https://console.yandex.cloud), select the folder to add the registry certificate to.
   1. Navigate to **IoT Core**.
   1. Select the required registry 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 registry:

  ```
  yc iot registry certificate add \
    --registry-name my-registry \ # Registry name.
    --certificate-file registry-cert.pem # Path to the public part of the certificate.
  ```
  
  Result:
  ```
  registry_id: b91ki3851hab********
  fingerprint: 589ce1605...
  certificate_data: |
    -----BEGIN CERTIFICATE-----
    MIIE/jCCAuagAw...
    -----END CERTIFICATE-----
  created_at: "2019-05-29T16:40:48.230Z"
  ```

- 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 registry created using Terraform:

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

     * `yandex_iot_core_registry`: Registry parameters:
       * `name`: Registry name.
       * `description`: Registry description.
       * `certificates`: List of registry certificates for authentication with [certificates](../../concepts/authorization.md#certs).

      Example registry description in the Terraform configuration:

      ```hcl
      resource "yandex_iot_core_registry" "my_registry" {
        name        = "test-registry"
        description = "test registry for terraform provider documentation"
      ...
        certificates = [
          file("<path_to_first_certificate_file>"),
          file("<path_to_second_certificate_file>")
        ]
      ...
      }
      ```

      For more on the properties of the `yandex_iot_core_registry` resource, see [this provider guide](../../../terraform/resources/iot_core_registry.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. Type `yes` and press **Enter** to confirm the changes.

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

      ```bash
      yc iot registry certificate list --registry-name <registry_name>
      ```

- API {#api}

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

{% endlist %}

## Deleting a certificate {#delete-cert}

{% list tabs group=instructions %}

- Management console {#console}

   To delete a registry certificate:

   1. In the [management console](https://console.yandex.cloud), select the folder to delete the registry certificate from.
   1. Navigate to **IoT Core**.
   1. Select the required registry 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 registry certificate:

      ```
      yc iot registry certificate delete --registry-name my-registry --fingerprint 0f...
      ```

  1. Make sure the certificate was deleted:

      ```
      yc iot registry certificate list --registry-name my-registry
	    ```
	  
	    Result:
	  
	    ```
      +-------------+------------+
      | 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 registry created using Terraform:

  1. Open the Terraform configuration file and delete the certificate value in the `certificates` section, in the registry description fragment. To remove all certificates, delete the entire `certificates` section.

      Example registry description in the Terraform configuration:

      ```hcl
      resource "yandex_iot_core_registry" "my_registry" {
        name        = "test-registry"
        description = "test registry for terraform provider documentation"
      ...
        certificates = [
          file("<path_to_first_certificate_file>"),
          file("<path_to_second_certificate_file>")
        ]
      ...
      }
      ```

      For more on the properties of the `yandex_iot_core_registry` resource, see [this provider guide](../../../terraform/resources/iot_core_registry.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. Type `yes` and press **Enter** to confirm the changes.

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

      ```bash
      yc iot registry certificate list --registry-name <registry_name>
      ```

- API {#api}

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

{% endlist %}