[Yandex Cloud documentation](../../index.md) > [Yandex Serverless Containers](../index.md) > [Step-by-step guides](index.md) > Managing a container > Mounting external resources to a container file system > Mounting an ephemeral disk

# Mounting an ephemeral disk to a container

{% note info %}

This feature is in the [Preview](../../overview/concepts/launch-stages.md) stage. To get access, contact [tech support](https://center.yandex.cloud/support) or your account manager.

{% endnote %}

{% list tabs group=instructions %}

- Management console {#console}
    
    1. In the [management console](https://console.yandex.cloud), select the folder with your container.
    1. Navigate to **Serverless Containers**.
    1. Select the container.
    1. In the left-hand menu, select ![image](../../_assets/console-icons/pencil-to-square.svg) **Editor**.
    1. Under **Mounted ephemeral disk**:

        1. Click **Add ephemeral disk**.
        1. Specify the following:

            * **Mount path**: Absolute mount path. Use this path to access the directory the disk will be mounted to.
            
                Do not use this path for anything other than an empty directory; otherwise, container initialization may fail, and the mounted ephemeral disk will become unavailable. To ensure that the ephemeral disk is mounted correctly, provide the full absolute path to the mount point.
            * **Disk size**: Amount of memory you want to allocate for the ephemeral disk you are mounting.
    1. Click **Create revision**.

- 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 mount an ephemeral disk to a container, run this command:

  ```bash
  yc serverless container revision deploy \
    --container-name=<container_name> \
    --environment <runtime_environment> \
    --image <container_image_path> \
    --memory <RAM_size> \
    --execution-timeout <execution_timeout> \
    --service-account-id <service_account_ID> \
    --mount type=ephemeral-disk,mount-point=<mount_point>,size=<disk_size>
  ```

  Where:

  * `--container-name`: Container name.
  * `--environment`: Runtime environment.
  * `--image`: Container image path.
  * `--memory`: Amount of RAM.
  * `--execution-timeout`: Maximum container execution time before timeout.
  * `--service-account-id`: Service account ID.
  * `--mount`: Ephemeral disk mount settings:
    * `type=ephemeral-disk`: Type of the file system being mounted.
    * `mount-point`: Absolute mount path. Use this path to access the directory the disk will be mounted to. Do not use this path for anything other than an empty directory; otherwise, container initialization may fail, and the mounted ephemeral disk will become unavailable. To ensure that the ephemeral disk is mounted correctly, provide the full absolute path to the mount point.
    * `size`: Ephemeral disk size in GB, e.g., `size=5GB`.

- 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 mount an ephemeral disk to a container:

  1. Open the Terraform configuration file and add the `mounts` section to the container description:

      ```hcl
      resource "yandex_serverless_container" "ephemeral_storage_container" {
        name               = "<container_name>"
        memory             = "<RAM_amount>"
        execution_timeout  = "<execution_timeout>"
        service_account_id = "<service_account_ID>"

        image {
          url = <container_image_path>
        }

        mounts {
          mount_point_path = <mount_point>
          ephemeral_disk {
            size_gb = <disk_size>
          }
        }
      }
      ```

      Where:

      * `mounts`: Ephemeral disk mount settings:
        * `mount_point_path`: Absolute mount path. Use this path to access the directory the disk will be mounted to. Do not use this path for anything other than an empty directory; otherwise, container initialization may fail, and the mounted ephemeral disk will become unavailable. To ensure that the ephemeral disk is mounted correctly, provide the full absolute path to the mount point.
        * `size_gb`: Ephemeral disk size in GB, e.g., `size=5GB`.

      For more on the properties of the `yandex_serverless_container` resource, see [this provider guide](../../terraform/resources/serverless_container.md).

  1. Apply the changes:

     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.

  You can check the container update and settings using the [management console](https://console.yandex.cloud) or this [CLI](../../cli/quickstart.md) command:

  ```bash
  yc serverless container revision get <container_revision_ID>
  ```

- API {#api}

  To mount an ephemeral disk, use the [deployRevision](../containers/api-ref/Container/deployRevision.md) REST API method for the [Container](../containers/api-ref/Container/index.md) resource or the [ContainerService/DeployRevision](../containers/api-ref/grpc/Container/deployRevision.md) gRPC API call.

{% endlist %}

## Useful links {#see-also}

* [Mounting external resources to a container file system](../concepts/mounting.md)
* [Mounting external resources to a function file system](../../functions/concepts/mounting.md)