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Dedicated Host:Create a dedicated host

Last Updated:Feb 26, 2024

This topic describes how to create a subscription dedicated host in the Elastic Compute Service (ECS) console.

Prerequisites

An Alibaba Cloud account is created and the required account information is provided. For more information, see Before you begin.

Procedure

  1. Log on to the ECS console.

  2. In the left-side navigation pane, choose Instances & Images > icon1 > Dedicated Hosts.

  3. In the top navigation bar, select the region and resource group to which the resource belongs. 地域

  4. On the Dedicated Hosts page, click Create DDH.

  5. On the page that appears, configure the following settings:

    Parameter or configuration item

    Feature

    Example:

    Billing Method

    You can select between Subscription and Pay-as-you-go.

    For more information about billing, see Overview.

    Subscription

    Region and Zone

    The region and zone where you want to create a dedicated host.

    For more information, see Regions and zones.

    China (Beijing) Zone L

    Dedicated Host Type

    The dedicated host type determines the types and quantities of ECS instances that you can deploy on the dedicated host. You can customize the vCPU-to-memory ratio for the host types g6s, c6s, and r6s. This allows you to flexibly allocate computing resources when you create ECS instances.

    For more information, see Dedicated host types.

    Important

    ECS instances on local SSD type dedicated hosts (such as local SSD type i2) do not support manual migration and automatic failover. If a local SSD type dedicated host fails, you can submit a ticket to migrate your instances. However, the data on local SSDs will be lost after the migration.

    Local SSD Type i2

    DDH Name

    The name of the dedicated host. The name must be 2 to 128 characters in length, and can contain letters, digits, periods (.), underscores (_), colons (:), and hyphens (-). It must start with a letter.

    DDH-test

    Quantity

    The number of dedicated hosts that you want to purchase.

    1

    Tag

    Each tag consists of a case-sensitive key-value pair. You can assign tags to dedicated hosts and manage them in groups.

    For more information, see Overview.

    We recommend that you keep the default setting.

    Resource Group

    Resource groups are a convenient way to manage your resources based on usage, permissions, and regions. You can group resources that have specific functions together and manage them according to roles and projects. You can add dedicated hosts to resource groups.

    For more information, see Resource groups.

    We recommend that you keep the default setting.

    Other Settings

    Some features in this section may not be available for all dedicated host types. Go to the DDH console to view the features offered by your dedicated host.

    • Allow Automatic Deployment:

      • If you select Allow Automatic Deployment, ECS instances are automatically deployed on dedicated hosts that have available resources. For more information, see Features.

      • If you do not select Allow Automatic Deployment, you must specify a dedicated host when you create an ECS instance.

      By default, the Allow Automatic Deployment option is selected.

    • Automatic Instance Migration upon DDH Failure:

      • If you select Automatic Instance Migration upon DDH Failure, the ECS instances on the dedicated host are automatically migrated to a healthy dedicated host if the original dedicated host fails.

      • If you do not enable this option, you must submit a ticket to apply for a new dedicated host if the original dedicated host fails.

      By default, the Automatic Instance Migration upon DDH Failure option is selected. You can change this setting after the dedicated host is created. For more information, see Configure auto failover.

      Important

      The feature is unavailable for local SSD type dedicated hosts.

    • CPU Overprovisioning Ratio: You can configure the CPU overprovisioning ratio only for the overprovisioned type. The CPU overprovisioning ratio affects the number of available vCPUs on a dedicated host. You can use the following formula to calculate the number of available vCPUs on a dedicated host of the overprovisioned type: Number of available vCPUs = Number of CPU cores × 2 × CPU overprovisioning ratio. In scenarios that do not require high CPU stability, such as development and test environments, you can increase the number of available vCPUs on a dedicated host by increasing the CPU overprovisioning ratio. This way, you can deploy more ECS instances of the same specification on the dedicated host and reduce the deployment cost.

      For example, the number of CPU cores on each g6s dedicated host is 52. If you set the CPU overprovisioning ratio of a g6s dedicated host to 4, the number of vCPUs on the dedicated host is 416.

      Important

      You can set the CPU overprovisioning ratio for overprovisioned types g6s, c6s, and r6s. You cannot set the CPU overprovisioning ratio for overprovisioned type v5.

    We recommend that you keep the default setting.

    Duration

    Select a subscription duration based on your business requirements.

    1 Month

    Auto-renewal

    Specify whether to enable auto-renewal.

    • Monthly subscription: The auto-renewal period is one month.

    • Yearly subscription: The auto-renewal period is one year.

    Not Enabled

    Terms of Service

    Read and select Dedicated Host Terms of Service.

    Select Dedicated Host Terms of Service.

  6. Click Preview.

  7. In the Preview dialog box, confirm the configurations and click Create Order.

  8. Complete the payment as prompted.

Result

You can view the created dedicated host on the Dedicated Hosts page. If the dedicated host enters the Running state, it can be used as expected. If the created dedicated host does not appear on the Dedicated Hosts page, wait for a while and refresh the page. asda

What to do next

After a dedicated host is created, you can create ECS instances on the dedicated host. For more information, see Create ECS instances on a dedicated host.